isomorphic-is-online

A simple utility you can use to know if you are online or not.

It relies on cross-fetch, thus it aims to work on Node, React Native and Web (with browserify / webpack) environments.

Installation

At the command-line terminal:

npm install --save isomorphic-is-online

Then in your code:

// Using ES6 modules with Babel or TypeScript
import isOnline from "isomorphic-is-online";

// Using CommonJS modules
const isOnline = require("isomorphic-is-online").default;

Usage

import isOnline from "isomorphic-is-online";

console.log("Are you able to reach the internet?");
isOnline().then(isOnline => {
  console.log("Response:", isOnline);
});

isOnline returns a promise which resolves to true if a connection can be established and resolves to false if it cannot or the network requests time out.

Default and custom options

An optional object can be passed to isOnline to customize some options:

option	type	default	description
urls	array of strings	["//1.1.1.1"]	List of urls to request to check connection status
timeout	number	3000	Milliseconds to wait before timing out the request

const options = {
  urls: ["https://www.apple.com", "//1.1.1.1"],
  timeout: 5000
};

isOnline(options).then(isOnline => {
  if (isOnline) {
    hackTheInternet();
  } else {
    beQuiet();
  }
});