authentication and authorization using jwt in node js

1exports.verifyUserToken = (req, res, next) => {
2    let token = req.headers.authorization;
3    if (!token) return res.status(401).send("Access Denied / Unauthorized request");
4
5    try {
6        token = token.split(' ')[1] // Remove Bearer from string
7
8        if (token === 'null' || !token) return res.status(401).send('Unauthorized request');
9
10        let verifiedUser = jwt.verify(token, config.TOKEN_SECRET);   // config.TOKEN_SECRET => 'secretKey'
11        if (!verifiedUser) return res.status(401).send('Unauthorized request')
12
13        req.user = verifiedUser; // user_id & user_type_id
14        next();
15
16    } catch (error) {
17        res.status(400).send("Invalid Token");
18    }
19
20}
21