How to implement jwt verify token in node js - node.js

Question

I tried to implement jwt token generation in node js.I got jwt token but how to validate token using node js crud operation.but I got token jwt verfiy code using callback function.without call back function used to implement async/awit function implement.
index.js
router.post('/', async (req, res) => {
(async function() {
try {
await client.connect();
console.log("Connected correctly to server");
const db = client.db('olc_prod_db');
//Validation
const { error } = validate.validate(req.body);
if (error)
{
return res.status(400).send(error.details[0].message);
}
else
{
const check_login = req.body
const r = await db.collection('UserRegistration').find().toArray();
r.forEach(element => {
if(element['username'] == check_login['username'])
{
const token = get_token.validate(req.body)
res.send({"token ":token})
}
else
{
return res.send(401,"Un Authorized");
}
});
}
client.close();
} catch(err) {
console.log(err.stack);
}
})();
});
authtoken.js
var jwt = require('jsonwebtoken')
function get_token(userdata)
{
var accessToken = jwt.sign(userdata, 'secretkey', {
//Set the expiration
expiresIn: 3600 //we are setting the expiration time of 1 hr.
});
//send the response to the caller with the accesstoken and data
console.log('Authentication is done successfully.....');
return accessToken
}
exports.validate = get_token;

Answer 1

const jwt = require('jsonwebtoken')
const config = require('../../config/default')
function verifyjwt(req,res,next){
const token = req.headers['authorization']
if(!token) return res.status(401).json('Unauthorize user')
try{
const decoded = jwt.verify(token,config.secret);
req.user = decoded
next()
}catch(e){
res.status(400).json('Token not valid')
}
}
module.exports = verifyjwt

Answer 2

const CONST = require('../../config')
exports.validJWTNeeded = (req, res, next) => {
if (req.headers['authorization']) {
try {
let authorization = req.headers['authorization'].split(' ');
if (authorization[0] !== 'Bearer') {
return res.status(401).send('invalid request'); //invalid request
} else {
req.jwt = jwt.verify(authorization[1], CONST.SECRET);
return next();
}
} catch (err) {
return res.status(403).send(); //invalid token
}
} else {
return res.status(401).send('invalid request');
}
}