diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..cd88554
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "gomod" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
new file mode 100644
index 0000000..f5b564a
--- /dev/null
+++ b/.github/workflows/go.yml
@@ -0,0 +1,44 @@
+# This workflow will build a golang project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go
+
+name: Go
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main", "dev" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: [ '1.21', '1.22', '1.23' ]
+    name: Go ${{ matrix.go }} sample
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go }}
+
+    - name: Build
+      run: go build -v ./...
+
+    - name: Test
+      run: go test ./... -coverprofile=./cover.out -covermode=atomic -coverpkg=./...
+
+    - name: check test coverage
+      uses: vladopajic/go-test-coverage@v2
+      with:
+        config: ./.testcoverage.yml
+        ## when token is not specified (value '') this feature is turned off
+        ## in this example badge is created and committed only for main branch
+        git-token: ${{ github.ref_name == 'main' && secrets.GITHUB_TOKEN || '' }}
+        ## name of branch where badges are stored
+        ## ideally this should be orphan branch (see below how to create this branch)
+        git-branch: badges
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
new file mode 100644
index 0000000..c78aa68
--- /dev/null
+++ b/.github/workflows/golangci-lint.yml
@@ -0,0 +1,30 @@
+name: golangci-lint
+on:
+  push:
+    branches:
+      - main
+      - dev
+  pull_request:
+
+permissions:
+  contents: read
+  # Optional: allow read access to pull request. Use with `only-new-issues` option.
+  # pull-requests: read
+
+jobs:
+  golangci:
+    strategy:
+      matrix:
+        go: [stable]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    name: lint
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go }}
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.60
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 6f72f89..ac5d06c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,5 @@ go.work.sum
 
 # env file
 .env
+
+.idea
diff --git a/.testcoverage.yml b/.testcoverage.yml
new file mode 100644
index 0000000..df1d9a6
--- /dev/null
+++ b/.testcoverage.yml
@@ -0,0 +1,50 @@
+# (mandatory)
+# Path to coverprofile file (output of `go test -coverprofile` command).
+#
+# For cases where there are many coverage profiles, such as when running
+# unit tests and integration tests separately, you can combine all those
+# profiles into one. In this case, the profile should have a comma-separated list
+# of profile files, e.g., 'cover_unit.out,cover_integration.out'.
+profile: cover.out
+
+# (optional; but recommended to set)
+# When specified reported file paths will not contain local prefix in the output
+local-prefix: "github.com/org/project"
+
+# Holds coverage thresholds percentages, values should be in range [0-100]
+threshold:
+  # (optional; default 0)
+  # The minimum coverage that each file should have
+  file: 70
+
+  # (optional; default 0)
+  # The minimum coverage that each package should have
+  package: 80
+
+  # (optional; default 0)
+  # The minimum total coverage project should have
+  total: 85
+
+# Holds regexp rules which will override thresholds for matched files or packages
+# using their paths.
+#
+# First rule from this list that matches file or package is going to apply
+# new threshold to it. If project has multiple rules that match same path,
+# override rules should be listed in order from specific to more general rules.
+override:
+  # Increase coverage threshold to 100% for `foo` package
+  # (default is 80, as configured above in this example)
+  - threshold: 100
+    path: ^pkg/lib/foo$
+
+# Holds regexp rules which will exclude matched files or packages
+# from coverage statistics
+exclude:
+  # Exclude files or packages matching their paths
+  paths:
+    - ^pkg/errors.go$
+    - ^pkg/bar     # exclude package `pkg/bar`
+
+# NOTES:
+# - symbol `/` in all path regexps will be replaced by current OS file path separator
+#   to properly work on Windows
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..059fdb1
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,15 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.0.1]
+
+### Added
+
+- Adding partial response gin framework.
+  - Support for arrays. 
+  - Support for nested objects.
+  - Support json wrapper response
\ No newline at end of file
diff --git a/README.md b/README.md
index dbaf0a7..f5d7b54 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,88 @@
+[![Go](https://github.com/manuelarte/milogo/actions/workflows/go.yml/badge.svg)](https://github.com/manuelarte/milogo/actions/workflows/go.yml)
+Add coverage badge once merged to main
 # Milogo
-Rest Partial response plugin
+Rest Partial Response (aka Field Selection) Pattern middleware for [Gin](https://gin-gonic.com/). This gin plugin allows you to select a subset of fields to be returned from your endpoints.
+e.g.
+```
+> /products/1
+{
+ "code": "1",
+ "price": "200",
+ "description": "Very nice product",
+ "manufacturedBy": "company"
+}
+```
+```
+> /products/1?fields=code,price
+{
+ "code": "1",
+ "price": "200",
+}
+```
+
+## 📝 How To Install It And Use It
+
+- Run the command:
+
+> go get -u -d github.com/manuelarte/milogo
+
+- Add milogo middleware
+```go
+r := gin.Default()
+r.Use(Milogo())
+```
+
+- Call your endpoints adding the query parameter `fields` with the fields you want to filter:
+```
+/users/1?fields=name,surname
+```
+
+## ✨ Features
+
+- Support for multiple fields filtering. Check [example](./examples/simple)
+
+```
+> /users/manuel?fields=name,surname
+{
+ "name": "Manuel",
+ "surname": "Example"
+}
+```
+
+- Support for arrays. Check [example](./examples/simple-array)
+
+```
+> /users?fields=name
+[
+  {
+    "name": "Manuel"
+  }
+]
+```
+
+- Support for nested jsons. Check [example](./examples/nested)
+
+```
+> /users/manuel?fields=name,surname,address(street,number)
+{
+ "name": "Manuel",
+ "surname": "Example",
+ "address": {
+   "street": "mystreet",
+   "zipcode": "myzipcode"
+ }
+}
+```
+
+- Support for json wrapped. Check [example](./examples/wrapped) 
+```
+TODO
+```
+
+## 🤝 Contributing
+
+Feel free to create a PR or suggest improvements or ideas.
+
+## 🔗 Contact
+
+- 📧 manueldoncelmartos@gmail.com
diff --git a/examples/nested/go.mod b/examples/nested/go.mod
new file mode 100644
index 0000000..8bd9bba
--- /dev/null
+++ b/examples/nested/go.mod
@@ -0,0 +1,33 @@
+module nested
+
+go 1.23.2
+
+require (
+	github.com/bytedance/sonic v1.12.4 // indirect
+	github.com/bytedance/sonic/loader v0.2.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.6 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/gin-gonic/gin v1.10.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.1 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.12.0 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+	golang.org/x/net v0.31.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.20.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/examples/nested/go.sum b/examples/nested/go.sum
new file mode 100644
index 0000000..e94b718
--- /dev/null
+++ b/examples/nested/go.sum
@@ -0,0 +1,76 @@
+github.com/bytedance/sonic v1.12.4 h1:9Csb3c9ZJhfUWeMtpCDCq6BUoH5ogfDFLUgQ/jG+R0k=
+github.com/bytedance/sonic v1.12.4/go.mod h1:B8Gt/XvtZ3Fqj+iSKMypzymZxw/FVwgIGKzMzT9r/rk=
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+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
diff --git a/examples/nested/main.go b/examples/nested/main.go
new file mode 100644
index 0000000..ec96b09
--- /dev/null
+++ b/examples/nested/main.go
@@ -0,0 +1,68 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+type Address struct {
+	Street  string `json:"street"`
+	Number  string `json:"number"`
+	ZipCode string `json:"zipcode"`
+}
+
+type User struct {
+	Name    string  `json:"name"`
+	Surname string  `json:"surname"`
+	Age     int     `json:"age"`
+	Address Address `json:"address"`
+}
+
+func setupRouter() *gin.Engine {
+	r := gin.Default()
+	r.Use()
+
+	// Get user value
+	r.GET("/users/:name", func(c *gin.Context) {
+		user := User{
+			Name:    c.Params.ByName("name"),
+			Surname: "Example",
+			Age:     1,
+			Address: Address{
+				Street:  "mystreet",
+				Number:  "mynumber",
+				ZipCode: "myzipcode",
+			},
+		}
+		c.IndentedJSON(http.StatusOK, user)
+	})
+
+	return r
+}
+
+func main() {
+	r := setupRouter()
+
+	go func() {
+		time.Sleep(time.Second)
+		w := httptest.NewRecorder()
+		req, _ := http.NewRequest("GET", "/users/manuel?fields=name,surname,address", nil)
+		r.ServeHTTP(w, req)
+		fmt.Printf("All the address fields:\n%s", w.Body.String())
+
+		w = httptest.NewRecorder()
+		req, _ = http.NewRequest("GET", "/users/manuel?fields=name,surname,address(name,zipcode)", nil)
+		r.ServeHTTP(w, req)
+		fmt.Printf("Some address fields:\n%s", w.Body.String())
+
+		os.Exit(1)
+	}()
+
+	// Listen and Server in 0.0.0.0:8080
+	_ = r.Run(":8080")
+}
diff --git a/examples/simple-array/go.mod b/examples/simple-array/go.mod
new file mode 100644
index 0000000..a7e8df9
--- /dev/null
+++ b/examples/simple-array/go.mod
@@ -0,0 +1,33 @@
+module simple-array
+
+go 1.23.2
+
+require (
+	github.com/bytedance/sonic v1.12.4 // indirect
+	github.com/bytedance/sonic/loader v0.2.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.6 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/gin-gonic/gin v1.10.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.1 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.12.0 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+	golang.org/x/net v0.31.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.20.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/examples/simple-array/go.sum b/examples/simple-array/go.sum
new file mode 100644
index 0000000..e94b718
--- /dev/null
+++ b/examples/simple-array/go.sum
@@ -0,0 +1,76 @@
+github.com/bytedance/sonic v1.12.4 h1:9Csb3c9ZJhfUWeMtpCDCq6BUoH5ogfDFLUgQ/jG+R0k=
+github.com/bytedance/sonic v1.12.4/go.mod h1:B8Gt/XvtZ3Fqj+iSKMypzymZxw/FVwgIGKzMzT9r/rk=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/bytedance/sonic/loader v0.2.1 h1:1GgorWTqf12TA8mma4DDSbaQigE2wOgQo7iCjjJv3+E=
+github.com/bytedance/sonic/loader v0.2.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
+github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQPiEFhY=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gabriel-vasile/mimetype v1.4.6 h1:3+PzJTKLkvgjeTbts6msPJt4DixhT4YtFNf1gtGe3zc=
+github.com/gabriel-vasile/mimetype v1.4.6/go.mod h1:JX1qVKqZd40hUPpAfiNTe0Sne7hdfKSbOqqmkq8GCXc=
+github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
+github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
+github.com/gin-gonic/gin v1.10.0 h1:nTuyha1TYqgedzytsKYqna+DfLos46nTv2ygFy86HFU=
+github.com/gin-gonic/gin v1.10.0/go.mod h1:4PMNQiOhvDRa013RKVbsiNwoyezlm2rm0uX/T7kzp5Y=
+github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
+github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
+github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
+github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
+github.com/go-playground/validator/v10 v10.22.1 h1:40JcKH+bBNGFczGuoBYgX4I6m/i27HYW8P9FDk5PbgA=
+github.com/go-playground/validator/v10 v10.22.1/go.mod h1:dbuPbCMFw/DrkbEynArYaCwl3amGuJotoKCe95atGMM=
+github.com/goccy/go-json v0.10.3 h1:KZ5WoDbxAIgm2HNbYckL0se1fHD6rz5j4ywS6ebzDqA=
+github.com/goccy/go-json v0.10.3/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
+github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
+github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/klauspost/cpuid/v2 v2.2.9 h1:66ze0taIn2H33fBvCkXuv9BmCwDfafmiIVpKV9kKGuY=
+github.com/klauspost/cpuid/v2 v2.2.9/go.mod h1:rqkxqrZ1EhYM9G+hXH7YdowN5R5RGN6NK4QwQ3WMXF8=
+github.com/knz/go-libedit v1.10.1/go.mod h1:MZTVkCWyz0oBc7JOWP3wNAzd002ZbM/5hgShxwh4x8M=
+github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
+github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
+github.com/pelletier/go-toml/v2 v2.2.3 h1:YmeHyLY8mFWbdkNWwpr+qIL2bEqT0o95WSdkNHvL12M=
+github.com/pelletier/go-toml/v2 v2.2.3/go.mod h1:MfCQTFTvCcUyyvvwm1+G6H/jORL20Xlb6rzQu9GuUkc=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
+github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
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+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
+rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
diff --git a/examples/simple-array/main.go b/examples/simple-array/main.go
new file mode 100644
index 0000000..e8c5c76
--- /dev/null
+++ b/examples/simple-array/main.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+type User struct {
+	Name    string `json:"name"`
+	Surname string `json:"surname"`
+	Age     int    `json:"age"`
+}
+
+func setupRouter() *gin.Engine {
+	r := gin.Default()
+	r.Use()
+
+	// Get user value
+	r.GET("/users", func(c *gin.Context) {
+		users := []*User{
+			{
+				Name:    "Manuel",
+				Surname: "Example",
+				Age:     99,
+			},
+			{
+				Name:    "Milo",
+				Surname: "Example",
+				Age:     99,
+			},
+		}
+		c.IndentedJSON(http.StatusOK, &users)
+	})
+
+	return r
+}
+
+func main() {
+	r := setupRouter()
+
+	go func() {
+		time.Sleep(time.Second)
+		w := httptest.NewRecorder()
+		req, _ := http.NewRequest("GET", "/users?fields=name,surname", nil)
+		r.ServeHTTP(w, req)
+		fmt.Println(w.Body.String())
+		os.Exit(1)
+	}()
+
+	// Listen and Server in 0.0.0.0:8080
+	_ = r.Run(":8080")
+}
diff --git a/examples/simple/go.mod b/examples/simple/go.mod
new file mode 100644
index 0000000..31a611c
--- /dev/null
+++ b/examples/simple/go.mod
@@ -0,0 +1,33 @@
+module simple
+
+go 1.23.2
+
+require (
+	github.com/bytedance/sonic v1.12.4 // indirect
+	github.com/bytedance/sonic/loader v0.2.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.6 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/gin-gonic/gin v1.10.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.1 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.12.0 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+	golang.org/x/net v0.31.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.20.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/examples/simple/go.sum b/examples/simple/go.sum
new file mode 100644
index 0000000..e94b718
--- /dev/null
+++ b/examples/simple/go.sum
@@ -0,0 +1,76 @@
+github.com/bytedance/sonic v1.12.4 h1:9Csb3c9ZJhfUWeMtpCDCq6BUoH5ogfDFLUgQ/jG+R0k=
+github.com/bytedance/sonic v1.12.4/go.mod h1:B8Gt/XvtZ3Fqj+iSKMypzymZxw/FVwgIGKzMzT9r/rk=
+github.com/bytedance/sonic/loader v0.1.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/bytedance/sonic/loader v0.2.1 h1:1GgorWTqf12TA8mma4DDSbaQigE2wOgQo7iCjjJv3+E=
+github.com/bytedance/sonic/loader v0.2.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
+github.com/cloudwego/base64x v0.1.4 h1:jwCgWpFanWmN8xoIUHa2rtzmkd5J2plF/dnLS6Xd/0Y=
+github.com/cloudwego/base64x v0.1.4/go.mod h1:0zlkT4Wn5C6NdauXdJRhSKRlJvmclQ1hhJgA0rcu/8w=
+github.com/cloudwego/iasm v0.2.0 h1:1KNIy1I1H9hNNFEEH3DVnI4UujN+1zjpuk6gwHLTssg=
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diff --git a/examples/simple/main.go b/examples/simple/main.go
new file mode 100644
index 0000000..3a627c6
--- /dev/null
+++ b/examples/simple/main.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+type User struct {
+	Name    string `json:"name"`
+	Surname string `json:"surname"`
+	Age     int    `json:"age"`
+}
+
+func setupRouter() *gin.Engine {
+	r := gin.Default()
+	r.Use()
+
+	// Get user value
+	r.GET("/users/:name", func(c *gin.Context) {
+		user := User{
+			Name:    c.Params.ByName("name"),
+			Surname: "Example",
+			Age:     1,
+		}
+		c.IndentedJSON(http.StatusOK, user)
+	})
+
+	return r
+}
+
+func main() {
+	r := setupRouter()
+
+	go func() {
+		time.Sleep(time.Second)
+		w := httptest.NewRecorder()
+		req, _ := http.NewRequest("GET", "/users/manuel?fields=name,surname", nil)
+		r.ServeHTTP(w, req)
+		fmt.Println(w.Body.String())
+		os.Exit(1)
+	}()
+
+	// Listen and Server in 0.0.0.0:8080
+	_ = r.Run(":8080")
+}
diff --git a/examples/wrapped/go.mod b/examples/wrapped/go.mod
new file mode 100644
index 0000000..ae9ac99
--- /dev/null
+++ b/examples/wrapped/go.mod
@@ -0,0 +1,33 @@
+module wrapped
+
+go 1.23.2
+
+require (
+	github.com/bytedance/sonic v1.12.4 // indirect
+	github.com/bytedance/sonic/loader v0.2.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.6 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/gin-gonic/gin v1.10.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.1 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.12.0 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+	golang.org/x/net v0.31.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.20.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/examples/wrapped/go.sum b/examples/wrapped/go.sum
new file mode 100644
index 0000000..e94b718
--- /dev/null
+++ b/examples/wrapped/go.sum
@@ -0,0 +1,76 @@
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+github.com/bytedance/sonic/loader v0.2.1 h1:1GgorWTqf12TA8mma4DDSbaQigE2wOgQo7iCjjJv3+E=
+github.com/bytedance/sonic/loader v0.2.1/go.mod h1:ncP89zfokxS5LZrJxl5z0UJcsk4M4yY2JpfqGeCtNLU=
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diff --git a/examples/wrapped/main.go b/examples/wrapped/main.go
new file mode 100644
index 0000000..620b680
--- /dev/null
+++ b/examples/wrapped/main.go
@@ -0,0 +1,73 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+type Address struct {
+	Street  string `json:"street"`
+	Number  string `json:"number"`
+	ZipCode string `json:"zipcode"`
+}
+
+type User struct {
+	Name    string  `json:"name"`
+	Surname string  `json:"surname"`
+	Age     int     `json:"age"`
+	Address Address `json:"address"`
+}
+
+type RestResponse[T any] struct {
+	Data     T   `json:"data"`
+	Metadata any `json:"_metadata"`
+}
+
+func setupRouter() *gin.Engine {
+	r := gin.Default()
+	r.Use()
+
+	// Get user value
+	r.GET("/users/:name", func(c *gin.Context) {
+		name := c.Params.ByName("name")
+		user := User{
+			Name:    name,
+			Surname: "Example",
+			Age:     1,
+			Address: Address{
+				Street:  "mystreet",
+				Number:  "mynumber",
+				ZipCode: "myzipcode",
+			},
+		}
+		c.IndentedJSON(http.StatusOK, RestResponse[User]{
+			Data: user,
+			Metadata: map[string]string{
+				"_link": "/users/" + name,
+			},
+		})
+	})
+
+	return r
+}
+
+func main() {
+	r := setupRouter()
+
+	go func() {
+		time.Sleep(time.Second)
+		w := httptest.NewRecorder()
+		req, _ := http.NewRequest("GET", "/users/manuel?fields=name,surname,address", nil)
+		r.ServeHTTP(w, req)
+		fmt.Printf(w.Body.String())
+		os.Exit(1)
+	}()
+
+	// Listen and Server in 0.0.0.0:8080
+	_ = r.Run(":8080")
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..b6544b9
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,39 @@
+module github.com/manuelarte/milogo
+
+go 1.21.0
+
+require (
+	github.com/gin-gonic/gin v1.10.0
+	github.com/stretchr/testify v1.9.0
+)
+
+require (
+	github.com/bytedance/sonic v1.12.4 // indirect
+	github.com/bytedance/sonic/loader v0.2.1 // indirect
+	github.com/cloudwego/base64x v0.1.4 // indirect
+	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.6 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.22.1 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.9 // indirect
+	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
+	github.com/ugorji/go/codec v1.2.12 // indirect
+	golang.org/x/arch v0.12.0 // indirect
+	golang.org/x/crypto v0.29.0 // indirect
+	golang.org/x/net v0.31.0 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.20.0 // indirect
+	google.golang.org/protobuf v1.35.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..ec6e58e
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,85 @@
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+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
diff --git a/milogo.go b/milogo.go
new file mode 100644
index 0000000..a098b0f
--- /dev/null
+++ b/milogo.go
@@ -0,0 +1,67 @@
+package milogo
+
+import (
+	"bytes"
+	"encoding/json"
+	"github.com/gin-gonic/gin"
+	"github.com/manuelarte/milogo/pkg"
+	"strings"
+)
+
+// customResponseWriter captures the response body for modification
+type customResponseWriter struct {
+	gin.ResponseWriter
+	body *bytes.Buffer
+}
+
+// Write captures the data in the body buffer
+func (w *customResponseWriter) Write(data []byte) (int, error) {
+	return w.body.Write(data)
+}
+
+func Milogo(configOptions ...pkg.ConfigOption) gin.HandlerFunc {
+	config := pkg.DefaultConfig(configOptions...)
+
+	return func(c *gin.Context) {
+		// Create a custom response writer
+		writer := &customResponseWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}
+		c.Writer = writer
+
+		// Continue to the next middleware/handler
+		c.Next()
+
+		// If the content-type is JSON, modify the JSON body
+		if isPartialResponseRequest(c, config) {
+			var jsonData interface{}
+			if err := json.Unmarshal(writer.body.Bytes(), &jsonData); err == nil {
+				fields := c.Query(config.QueryParamField)
+
+				wrappedJsonData := jsonData
+				if config.WrapperField != "" {
+					wrappedJsonData = jsonData.(map[string]interface{})[config.WrapperField]
+				}
+				if partialResponseFields, errParsing := config.Parser.Parse(fields); errParsing == nil &&
+					pkg.Filter(wrappedJsonData, partialResponseFields) == nil {
+					modifiedBody, err := json.Marshal(jsonData)
+					if err == nil {
+						c.Writer = writer.ResponseWriter // Set back to original writer
+						_, _ = c.Writer.Write(modifiedBody)
+
+						return
+					}
+				}
+			}
+		}
+
+		// If JSON parsing fails or content-type is not applicable, write the original body
+		c.Writer = writer.ResponseWriter
+		_, _ = c.Writer.Write(writer.body.Bytes())
+	}
+}
+
+func isPartialResponseRequest(c *gin.Context, config pkg.Config) bool {
+	isJson := strings.Contains(c.Writer.Header().Get("Content-Type"), "application/json")
+	isFieldQuery := c.Query(config.QueryParamField) != ""
+
+	return isJson && isFieldQuery
+}
diff --git a/milogo_test.go b/milogo_test.go
new file mode 100644
index 0000000..6eb1f76
--- /dev/null
+++ b/milogo_test.go
@@ -0,0 +1,251 @@
+package milogo
+
+import (
+	"bytes"
+	"encoding/json"
+	"github.com/gin-gonic/gin"
+	"github.com/manuelarte/milogo/pkg"
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestEchoRoute(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		body     interface{}
+		fields   string
+		expected string
+	}{
+		"no query param fields": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "",
+			expected: `{"name":"Manuel","age":99}`,
+		},
+		"query param fields, 1/2": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "name",
+			expected: `{"name":"Manuel"}`,
+		},
+		"query param fields, 2/2": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "name,age",
+			expected: `{"name":"Manuel","age":99}`,
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			router := setupRouter()
+			url := "/echo"
+			router.POST(url, func(c *gin.Context) {
+				var body map[string]interface{}
+				err := c.BindJSON(&body)
+				if err != nil {
+					c.Status(400)
+
+					return
+				}
+				c.JSON(200, body)
+			})
+
+			w := httptest.NewRecorder()
+			out, err := json.Marshal(test.body)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if test.fields != "" {
+				url += "?fields=" + test.fields
+			}
+			req, _ := http.NewRequest("POST", url, bytes.NewBuffer(out))
+			router.ServeHTTP(w, req)
+
+			assert.Equal(t, 200, w.Code)
+			assert.JSONEq(t, test.expected, w.Body.String())
+		})
+	}
+}
+
+func TestEchoCustomHeadersRoute(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		body               interface{}
+		fields             string
+		customHeaders      map[string]string
+		expectedHttpStatus int
+		expectedBody       string
+	}{
+		"query param fields, 1/2, one custom header": {
+			body:               map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:             "name",
+			customHeaders:      map[string]string{"X-Milogo": "one_deleted"},
+			expectedHttpStatus: http.StatusOK,
+			expectedBody:       `{"name":"Manuel"}`,
+		},
+		"query param fields, 2/2, two custom headers": {
+			body:               map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:             "name,age",
+			customHeaders:      map[string]string{"X-Milogo": "one_deleted", "X-Trace-id": "1"},
+			expectedHttpStatus: http.StatusAccepted,
+			expectedBody:       `{"name":"Manuel","age":99}`,
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			router := setupRouter()
+			url := "/echo-headers"
+			router.POST(url, func(c *gin.Context) {
+				for key, value := range test.customHeaders {
+					c.Writer.Header().Add(key, value)
+				}
+
+				var body map[string]interface{}
+				err := c.BindJSON(&body)
+				if err != nil {
+					c.Status(400)
+
+					return
+				}
+				c.JSON(test.expectedHttpStatus, body)
+			})
+
+			w := httptest.NewRecorder()
+			out, err := json.Marshal(test.body)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if test.fields != "" {
+				url += "?fields=" + test.fields
+			}
+			req, _ := http.NewRequest("POST", url, bytes.NewBuffer(out))
+			router.ServeHTTP(w, req)
+
+			assert.Equal(t, test.expectedHttpStatus, w.Code)
+			for key, value := range test.customHeaders {
+				assert.Equal(t, value, w.Header().Get(key))
+			}
+			assert.JSONEq(t, test.expectedBody, w.Body.String())
+		})
+	}
+}
+
+func TestArrayRoute(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		body     map[string]interface{}
+		fields   string
+		expected string
+	}{
+		"no query param fields": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "",
+			expected: `[{"name":"Manuel","age":99}]`,
+		},
+		"query param one field": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "name",
+			expected: `[{"name":"Manuel"}]`,
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			router := setupRouter()
+			router.POST("/array-echo", func(c *gin.Context) {
+				var body []*map[string]interface{}
+				body = append(body, &test.body)
+				c.JSON(200, body)
+			})
+
+			w := httptest.NewRecorder()
+			out, err := json.Marshal(test.body)
+			if err != nil {
+				t.Fatal(err)
+			}
+			url := "/array-echo"
+			if test.fields != "" {
+				url += "?fields=" + test.fields
+			}
+			req, _ := http.NewRequest("POST", url, bytes.NewBuffer(out))
+			router.ServeHTTP(w, req)
+
+			assert.Equal(t, 200, w.Code)
+			assert.JSONEq(t, test.expected, w.Body.String())
+		})
+	}
+}
+
+func TestEchoWrapRoute(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		body     interface{}
+		fields   string
+		expected string
+	}{
+		"no query param fields": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "",
+			expected: `{"data":{"name":"Manuel","age":99}}`,
+		},
+		"query param fields, 1/2": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "name",
+			expected: `{"data":{"name":"Manuel"}}`,
+		},
+		"query param fields, 2/2": {
+			body:     map[string]interface{}{"name": "Manuel", "age": 99},
+			fields:   "name,age",
+			expected: `{"data":{"name":"Manuel","age":99}}`,
+		},
+		"query param in array, 1/2": {
+			body:     []map[string]interface{}{{"name": "Manuel", "age": 99}},
+			fields:   "name,age",
+			expected: `{"data":[{"name":"Manuel","age":99}]}`,
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			milogoOption, _ := pkg.WithWrapField("data")
+			router := setupRouter(milogoOption)
+			url := "/echo-wrap"
+			router.POST(url, func(c *gin.Context) {
+				type Response struct {
+					Data interface{} `json:"data"`
+				}
+				c.JSON(200, Response{Data: test.body})
+			})
+
+			w := httptest.NewRecorder()
+			out, err := json.Marshal(test.body)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if test.fields != "" {
+				url += "?fields=" + test.fields
+			}
+			req, _ := http.NewRequest("POST", url, bytes.NewBuffer(out))
+			router.ServeHTTP(w, req)
+
+			assert.Equal(t, 200, w.Code)
+			assert.JSONEq(t, test.expected, w.Body.String())
+		})
+	}
+}
+
+func setupRouter(configOptions ...pkg.ConfigOption) *gin.Engine {
+	r := gin.Default()
+	r.Use(Milogo(configOptions...))
+
+	return r
+}
diff --git a/pkg/errors.go b/pkg/errors.go
new file mode 100644
index 0000000..de69a42
--- /dev/null
+++ b/pkg/errors.go
@@ -0,0 +1,27 @@
+package pkg
+
+import (
+	"errors"
+	"fmt"
+)
+
+var (
+	ErrFieldsIsEmpty         = errors.New("fields is empty")
+	ErrFieldIsEmpty          = errors.New("field is empty")
+	ErrUnbalancedParenthesis = errors.New("unbalanced parentheses")
+	ErrUnrecognizedFormat    = errors.New("unrecognized format")
+)
+
+var _ error = new(FieldIsNotObjectError)
+
+func NotAnObjectError(field string) FieldIsNotObjectError {
+	return FieldIsNotObjectError{field: field}
+}
+
+type FieldIsNotObjectError struct {
+	field string
+}
+
+func (f FieldIsNotObjectError) Error() string {
+	return fmt.Sprintf("Field '%s' is not object", f.field)
+}
diff --git a/pkg/model.go b/pkg/model.go
new file mode 100644
index 0000000..cee2c14
--- /dev/null
+++ b/pkg/model.go
@@ -0,0 +1,28 @@
+package pkg
+
+type Config struct {
+	QueryParamField string
+	WrapperField    string
+	Parser          Parser
+}
+
+func DefaultConfig(configOptions ...ConfigOption) Config {
+	c := Config{
+		QueryParamField: "fields",
+		Parser:          NewParser(),
+	}
+	for _, co := range configOptions {
+		co(&c)
+	}
+
+	return c
+}
+
+type ConfigOption func(c *Config)
+
+func WithWrapField(wrapperField string) (ConfigOption, error) {
+	// validate wrapper field is not several words, but only one and alphanumeric
+	return func(c *Config) {
+		c.WrapperField = wrapperField
+	}, nil
+}
diff --git a/pkg/parser.go b/pkg/parser.go
new file mode 100644
index 0000000..f85778a
--- /dev/null
+++ b/pkg/parser.go
@@ -0,0 +1,104 @@
+package pkg
+
+const (
+	defaultFieldSeparator = ","
+)
+
+type JsonField interface{}
+
+var _ JsonField = new(JsonFieldValue)
+var _ JsonField = new(JsonFieldObject)
+
+// JsonFieldValue Holder that indicates that the field is just a value.
+type JsonFieldValue struct{}
+
+type JsonFieldObject map[string]JsonField
+
+func NewParser() Parser {
+	return Parser{
+		fieldSeparator: defaultFieldSeparator,
+	}
+}
+
+type Parser struct {
+	fieldSeparator string
+}
+
+// Parse String to get what fields are present.
+func (p Parser) Parse(fields string) (JsonFieldObject, error) {
+	if fields == "" {
+		return nil, ErrFieldsIsEmpty
+	}
+	openParenthesis := 0
+	index := 0
+	toReturn, err := p.parseChunk(fields, &index, &openParenthesis)
+	if err != nil {
+		return nil, err
+	}
+	// check wrong number of parenthesis
+
+	return toReturn, nil
+}
+
+func (p Parser) parseChunk(chunk string, index *int, openParenthesis *int) (JsonFieldObject, error) {
+	if chunk == "" {
+		return nil, ErrFieldIsEmpty
+	}
+	toReturn := JsonFieldObject{}
+	field := ""
+	for *index < len(chunk) {
+		char := string(chunk[*index])
+		switch char {
+		case p.fieldSeparator:
+			if field != "" {
+				err := p.addFieldValue(field, toReturn)
+				if err != nil {
+					return toReturn, err
+				}
+				field = ""
+			}
+		case "(":
+			*openParenthesis++
+			*index++
+			newJsonField, err := p.parseChunk(chunk, index, openParenthesis)
+			if err != nil {
+				return toReturn, err
+			}
+			toReturn[field] = newJsonField
+			field = ""
+		case ")":
+			*openParenthesis--
+			if field != "" {
+				err := p.addFieldValue(field, toReturn)
+				if err != nil {
+					return toReturn, err
+				}
+			}
+
+			return toReturn, nil
+		default:
+			field += char
+		}
+		*index++
+	}
+	if len(field) > 0 {
+		err := p.addFieldValue(field, toReturn)
+		if err != nil {
+			return toReturn, err
+		}
+	}
+	if *openParenthesis != 0 {
+		return nil, ErrUnbalancedParenthesis
+	}
+
+	return toReturn, nil
+}
+
+func (p Parser) addFieldValue(field string, object JsonFieldObject) error {
+	if field == "" {
+		return ErrFieldIsEmpty
+	}
+	object[field] = JsonFieldValue{}
+
+	return nil
+}
diff --git a/pkg/parser_test.go b/pkg/parser_test.go
new file mode 100644
index 0000000..24cdcd4
--- /dev/null
+++ b/pkg/parser_test.go
@@ -0,0 +1,53 @@
+package pkg
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestParser(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		fields   string
+		expected JsonFieldObject
+	}{
+		"querying simple fields": {
+			fields:   "name,age",
+			expected: JsonFieldObject{"name": JsonFieldValue{}, "age": JsonFieldValue{}},
+		},
+		"querying simple and complex field": {
+			fields:   "name,address(street,number)",
+			expected: JsonFieldObject{"name": JsonFieldValue{}, "address": JsonFieldObject{"street": JsonFieldValue{}, "number": JsonFieldValue{}}},
+		},
+		"querying simple and nested complex fields": {
+			fields: "a,b(c,d,e(f,g))",
+			expected: JsonFieldObject{"a": JsonFieldValue{},
+				"b": JsonFieldObject{"c": JsonFieldValue{}, "d": JsonFieldValue{},
+					"e": JsonFieldObject{"f": JsonFieldValue{}, "g": JsonFieldValue{}}}},
+		},
+		"querying complex fields in the middle": {
+			fields: "a,b(c,d,e),f,g",
+			expected: JsonFieldObject{"a": JsonFieldValue{},
+				"b": JsonFieldObject{"c": JsonFieldValue{}, "d": JsonFieldValue{}, "e": JsonFieldValue{}},
+				"f": JsonFieldValue{}, "g": JsonFieldValue{}},
+		},
+		"querying complex fields in several places": {
+			fields: "a,b(c,d),e(f,g)",
+			expected: JsonFieldObject{"a": JsonFieldValue{},
+				"b": JsonFieldObject{"c": JsonFieldValue{}, "d": JsonFieldValue{}},
+				"e": JsonFieldObject{"f": JsonFieldValue{}, "g": JsonFieldValue{}}},
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			parser := NewParser()
+			actual, err := parser.Parse(test.fields)
+			if assert.NoError(t, err) {
+				assert.Equal(t, test.expected, actual)
+			}
+		})
+	}
+}
diff --git a/pkg/utils.go b/pkg/utils.go
new file mode 100644
index 0000000..74ee756
--- /dev/null
+++ b/pkg/utils.go
@@ -0,0 +1,45 @@
+package pkg
+
+func Filter(jsonData interface{}, partialResponseFields JsonFieldObject) error {
+	if casted, ok := jsonData.(map[string]interface{}); ok {
+		return filterMap(casted, partialResponseFields)
+	} else if array, ok := jsonData.([]interface{}); ok {
+		for _, item := range array {
+			if casted, ok := item.(map[string]interface{}); ok {
+				if err := filterMap(casted, partialResponseFields); err != nil {
+					return err
+				}
+			}
+		}
+
+		return nil
+	}
+
+	return ErrUnrecognizedFormat
+}
+
+func filterMap(jsonData map[string]interface{}, partialResponseFields JsonFieldObject) error {
+	for key, value := range jsonData {
+		if _, ok := partialResponseFields[key]; !ok {
+			delete(jsonData, key)
+		} else {
+			if values, ok := value.([]map[string]interface{}); ok {
+				for _, value := range values {
+					if nestedPartialResponse, ok := partialResponseFields[key].(JsonFieldObject); ok {
+						return filterMap(value, nestedPartialResponse)
+					}
+				}
+			} else {
+				if casted, ok := partialResponseFields[key].(JsonFieldObject); ok {
+					if nestedObject, ok := value.(map[string]interface{}); ok {
+						return filterMap(nestedObject, casted)
+					} else {
+						return NotAnObjectError(key)
+					}
+				}
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/pkg/utils_test.go b/pkg/utils_test.go
new file mode 100644
index 0000000..1c55ac3
--- /dev/null
+++ b/pkg/utils_test.go
@@ -0,0 +1,92 @@
+package pkg
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestFilter(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		jsonData        map[string]interface{}
+		jsonFieldObject JsonFieldObject
+		expected        map[string]interface{}
+	}{
+		"no nested json,querying one not existing field": {
+			jsonData:        map[string]interface{}{"name": "Manuel", "age": 99},
+			jsonFieldObject: JsonFieldObject{"surname": JsonFieldValue{}},
+			expected:        map[string]interface{}{},
+		},
+		"no nested json,querying one field": {
+			jsonData:        map[string]interface{}{"name": "Manuel", "age": 99},
+			jsonFieldObject: JsonFieldObject{"name": JsonFieldValue{}},
+			expected:        map[string]interface{}{"name": "Manuel"},
+		},
+		"no nested json,querying two field": {
+			jsonData:        map[string]interface{}{"name": "Manuel", "age": 99},
+			jsonFieldObject: JsonFieldObject{"name": JsonFieldValue{}, "age": JsonFieldValue{}},
+			expected:        map[string]interface{}{"name": "Manuel", "age": 99},
+		},
+		"nested json,querying all nested field": {
+			jsonData: map[string]interface{}{"name": "Manuel", "age": 99,
+				"address": map[string]interface{}{"street": "mystreet", "number": 1}},
+			jsonFieldObject: JsonFieldObject{"name": JsonFieldValue{}, "age": JsonFieldValue{}, "address": JsonFieldValue{}},
+			expected: map[string]interface{}{"name": "Manuel", "age": 99,
+				"address": map[string]interface{}{"street": "mystreet", "number": 1}},
+		},
+		"nested array json,querying all nested fields": {
+			jsonData: map[string]interface{}{"name": "Manuel", "age": 99,
+				"addresses": []map[string]interface{}{{"street": "mystreet", "number": 1}}},
+			jsonFieldObject: JsonFieldObject{"name": JsonFieldValue{}, "age": JsonFieldValue{}, "addresses": JsonFieldValue{}},
+			expected: map[string]interface{}{"name": "Manuel", "age": 99,
+				"addresses": []map[string]interface{}{{"street": "mystreet", "number": 1}}},
+		},
+		"nested array json,querying one nested field": {
+			jsonData: map[string]interface{}{"name": "Manuel", "age": 99,
+				"addresses": []map[string]interface{}{{"street": "mystreet", "number": 1}}},
+			jsonFieldObject: JsonFieldObject{"name": JsonFieldValue{}, "age": JsonFieldValue{},
+				"addresses": JsonFieldObject{"street": JsonFieldValue{}}},
+			expected: map[string]interface{}{"name": "Manuel", "age": 99,
+				"addresses": []map[string]interface{}{{"street": "mystreet"}}},
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			err := Filter(test.jsonData, test.jsonFieldObject)
+			if assert.NoError(t, err) {
+				assert.Equal(t, test.expected, test.jsonData)
+			}
+		})
+	}
+}
+
+// TODO Test starting object is an array
+
+func TestFilterErrors(t *testing.T) {
+	t.Parallel()
+
+	tests := map[string]struct {
+		jsonData        map[string]interface{}
+		jsonFieldObject JsonFieldObject
+		expected        error
+	}{
+		"querying not existing nested json": {
+			jsonData:        map[string]interface{}{"name": "Manuel", "age": 99},
+			jsonFieldObject: JsonFieldObject{"name": JsonFieldObject{"a": JsonFieldValue{}, "b": JsonFieldValue{}}},
+			expected:        NotAnObjectError("name"),
+		},
+	}
+	for name, test := range tests {
+		name, test := name, test
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			err := Filter(test.jsonData, test.jsonFieldObject)
+			if assert.Error(t, err) {
+				assert.Equal(t, test.expected, err)
+			}
+		})
+	}
+}