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const express = require('express');
const jwt = require('jsonwebtoken');
const jwtPassword = "1234";
const app = express();
const port = 3000;
app.use(express.json());

const allUsers = [{
    username : "kushalatolia@gmail.com",
    password : "Katolia",
    name : "Kushal Atolia"
},
{
    username : "tavishiseth@gmail.com",
    password : "Tseth",
    name : "Tavishi Seth"
}];

function userExist (username, password) {
    let result = allUsers.find((x) => x.username === username && x.password === password);
    if(!result) {
        return false;
    } else {
        return true;
    }
}

app.post("/signin", (req, res) => {
    const username = req.body.username;
    const password = req.body.password;

    if(!userExist(username, password)) {
        res.status(403).json({
            msg : "User does not Exist"
        })
        return;
    }
    var token = jwt.sign({username : username}, jwtPassword);
    console.log(token);
    res.json({
        token,
    }); 
});

app.get("/users", (req, res) => {
    const token = req.headers.authorization;
    try {
        const decode = jwt.verify(token, jwtPassword);
        const username = decode.username;
        res.json({
            username,
        })
    } catch {
        res.status(403).json({
            msg : "Error decoding"
        })
    }
})

app.listen(port, () => {
    console.log(`Example app listening on port ${port}`)
  })
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