jwt authentication in node js code example

Example 1: jwt implementation in node js

const jwt = require("jsonwebtoken")

const jwtKey = "my_secret_key"
const jwtExpirySeconds = 300

const users = {
	user1: "password1",
	user2: "password2",
}

const signIn = (req, res) => {
	// Get credentials from JSON body
	const { username, password } = req.body
	if (!username || !password || users[username] !== password) {
		// return 401 error is username or password doesn't exist, or if password does
		// not match the password in our records
		return res.status(401).end()
	}

	// Create a new token with the username in the payload
	// and which expires 300 seconds after issue
	const token = jwt.sign({ username }, jwtKey, {
		algorithm: "HS256",
		expiresIn: jwtExpirySeconds,
	})
	console.log("token:", token)

	// set the cookie as the token string, with a similar max age as the token
	// here, the max age is in milliseconds, so we multiply by 1000
	res.cookie("token", token, { maxAge: jwtExpirySeconds * 1000 })
	res.end()
}

Example 2: jwt token example in node js

function authenticateToken(req, res, next) {
  // Gather the jwt access token from the request header
  const authHeader = req.headers['authorization']
  const token = authHeader && authHeader.split(' ')[1]
  if (token == null) return res.sendStatus(401) // if there isn't any token

  jwt.verify(token, process.env.ACCESS_TOKEN_SECRET as string, (err: any, user: any) => {
    console.log(err)
    if (err) return res.sendStatus(403)
    req.user = user
    next() // pass the execution off to whatever request the client intended
  })
}

Example 3: authentication-and-authorization-using-jwt-in-node-js

exports.verifyUserToken = (req, res, next) => {
    let token = req.headers.authorization;
    if (!token) return res.status(401).send("Access Denied / Unauthorized request");

    try {
        token = token.split(' ')[1] // Remove Bearer from string

        if (token === 'null' || !token) return res.status(401).send('Unauthorized request');

        let verifiedUser = jwt.verify(token, config.TOKEN_SECRET);   // config.TOKEN_SECRET => 'secretKey'
        if (!verifiedUser) return res.status(401).send('Unauthorized request')

        req.user = verifiedUser; // user_id & user_type_id
        next();

    } catch (error) {
        res.status(400).send("Invalid Token");
    }

}