ExpressJS - JWT and Passport Implementation - express

Question

I'm currently trying to learn JWT and Passport for ExpressJS while trying them out but I can't seem to grasp the idea of how Passport works.
Here's what I have done initially in my ExpressJS application.
/api/login POST API
Accepts username and password
/api/login then creates a JWT with the username and password as the payload
The token is then responded to the client
I think my /api/login API simulates the general idea of JWT of hard authenticate once and respond with token.
/api/test GET API on the other hand
Only authenticated users can access
Simply returns "Hello World!"
What is the problem/s?
My code doesn't seem to validate the token (I tried putting the token in Authenticate header.
Where in my request should I include the token returned from /api/login when requesting to /api/test?
Now to my actual code:
app.js
var express = require("express");
var bodyParser = require("body-parser");
var jwt = require("jsonwebtoken");
var passport = require("passport");
var LocalStrategy = require('passport-local').Strategy;
var mySecret = "mySecret";
var app = express();
var port = process.env.PORT || 3000;
app.use(bodyParser.json());
passport.use(new LocalStrategy(
function (token, done) {
var credentials = jwt.verify(token, mySecret);
if (credentials.username == "test" && credentials.password == "test") {
return done(null, credentials);
} else {
return done(null, false);
}
}
));
app.use(passport.initialize());
app.post("/api/login", function (request, response) {
var user = {
"username": request.body.username,
"password": request.body.password
};
response.send(jwt.sign(user, "mySecret"));
});
app.get("/api/test", passport.authenticate("local", {
"session": false
}), function (request, response) {
response.send("Hello World!");
});
app.listen(port, function () {
console.log("Listening on port: " + port);
});

Answer 1

You need to configure jwtStratagy also to authenticate the user.
here is working example: -
const express = require("express");
const bodyParser = require("body-parser");
const jwt = require("jsonwebtoken");
console.log(jwt.verify);
const passport = require("passport"),
LocalStrategy = require("passport-local").Strategy;
const cors = require("cors");
const app = express();
app.use(cors());
app.use(bodyParser.json());
app.use(passport.initialize());
var secret = '11210646';
var JwtStrategy = require('passport-jwt').Strategy,
ExtractJwt = require('passport-jwt').ExtractJwt;
passport.use(new LocalStrategy({
usernameField: 'username',
passwordField: 'password',
passReqToCallback: true
},
function(req, username, password, done) {
console.log('ohh', username, password);
let err = null;
if (err) { return done(err); }
if (username != 'abhi') {
return done(null, false, { message: 'Incorrect username.' });
}
if (password != 'pass') {
return done(null, false, { message: 'Incorrect password.' });
}
return done(null, username);
}
));
app.post('/login', function(req, res, next) {
passport.authenticate('local', function(err, user, info) {
console.log(err, user, info);
if (err) { return next(err); }
if (!user) { res.send({ "status": info.message }); }
res.send({ "status": user });
})(req, res, next);
});
var opts = {
jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
secretOrKey: secret,
issuer: 'jonu',
audience: 'jonu bhai',
passReqToCallback: false
};
app.post('/me2', function(req, res, next) {
passport.authenticate('jwt', { session: false }, function(err,user, info) {
if (err) { return next(err); }
if (!user) { res.send({ "status": info.message }); }
res.send({ "status": user });
})(req, res, next);
});
//jwt
passport.use(new JwtStrategy(opts, function(jwt_payload, done) {
let err = null;
if (err) {
return done(err, false);
}
if (jwt_payload) {
return done(null, jwt_payload);
}
else {
return done(null, false);
// or you could create a new account
}
}));
app.post('/signup', (req, res) => {
let token = jwt.sign({
user: {
id: "idididid",
name: "Abhishek Singh",
username: "abhishek11210646"
}
},
secret, {
algorithm: 'HS256',
expiresIn: '5h',
issuer: 'jonu',
audience: 'jonu bhai'
});
res.send({ "token": token });
});
app.get('/', (req, res) => {
res.send({ "status": "Up and Running..." });
});
app.listen(8080, () => {
console.log('server running');
});