server.js

const express = require("express");
const app = express();
const fs = require("fs");
const PORT = process.env.PORT || 3000;

app.use(express.json())

// serve files in the public folder using express
app.use(express.static('public'));

app.get('/', (req, res) => {
    res.sendFile('home.html', { root: __dirname + "/public"});
});

// fetch word function is received here, returns a random word
app.post("/word", (req, res) => {
    let wordLength = req.body.word;
    console.log("received word length: " + wordLength)

    fs.readFile(__dirname + '/wordList.JSON', (error, data) => {
        if (error) {
            console.error(error)
            return
        }
        try {
            let words = JSON.parse(data)
            const randomIndex = Math.floor(Math.random() * words[wordLength].length);
            let randomWord = words[wordLength][randomIndex];

            console.log("random word chosen: ", randomWord)

            const responseString = randomWord.toLowerCase() ;
            res.json({ responseString });
        }
        catch (parseError){
            console.error(parseError)
        }
    })
})

// check if the word user input is in the list
app.post("/checkWord", (req, res) => {
    let userWord = req.body.userWord.toLowerCase();
    console.log("received userWord: " + userWord)

    fs.readFile(__dirname + '/wordList.JSON', (error, data) => {
        if (error) {
            console.error(error)
            res.status(500).send("Error reading word list");
            return;
        }
        try {
            let words = JSON.parse(data)
            let validWords = new Map();
            words['5'].forEach(word => validWords.set(word.toLowerCase(), true));

            let response = validWords.has(userWord);
            console.log(response ? "Valid word!" : "Invalid word!");
            res.json( { response });
        }
        catch (parseError){
            console.error(parseError);
            res.status(500).send("Error parsing word list");
        }
    })
})

// when feedback page is loaded, returns the feedbacks store in the JSON file
app.get('/getData', function(req, res) {
    fs.readFile(__dirname + '/feedbacks.JSON', function(error, data) {
        if (error) {
            throw error;
        }
        const jsonData = JSON.parse(data)
        res.json(jsonData);
    })
})

// when feedback is being submitted, the name and description along with time is added to JSON file
app.post('/addFeedback', function(req, res){
    // Get form data from request body
    const name = req.body.name;
    const feedback = req.body.feedback;
    const time = req.body.time;

    // Load existing feedback data from JSON
    const feedbackData = fs.readFileSync(__dirname + '/feedbacks.JSON');
    const feedbacks = JSON.parse(feedbackData);

    // Add new feedback to array
    feedbacks.push({
        name: name,
        feedback: feedback,
        time: time
    })

    // Save updated feedback data to JSON file
    fs.writeFileSync( __dirname + '/feedbacks.JSON', JSON.stringify(feedbacks, null, 2));

    // Send response indicating success
    res.sendStatus(200);
})

app.listen(PORT, () => {
    console.log(`Microservice is listening on port ${PORT}`);
});