CODEWITHSUNDEEP
node.jsexpressjwt
David
David

Reputation: 31

JWT ERROR TypeError: Right-hand side of 'instanceof' is not an object

Im trying to create an application with express and JWT (JsonWebToken). It works localy but when i try to use it on my server at home it gives an error. I spend like an hour trying to find a solution but nothing works.

TypeError: Right-hand side of 'instanceof' is not an object
    at Object.module.exports [as sign] (/home/container/node_modules/jsonwebtoken/sign.js:108:58)
    at server.post (/home/container/server.js:51:9)
    at Layer.handle [as handle_request] (/home/container/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/container/node_modules/express/lib/router/route.js:144:13)
    at Route.dispatch (/home/container/node_modules/express/lib/router/route.js:114:3)
    at Layer.handle [as handle_request] (/home/container/node_modules/express/lib/router/layer.js:95:5)
    at /home/container/node_modules/express/lib/router/index.js:284:15
    at Function.process_params (/home/container/node_modules/express/lib/router/index.js:346:12)
    at next (/home/container/node_modules/express/lib/router/index.js:280:10)
    at /home/container/node_modules/body-parser/lib/read.js:137:5

It is a really a simple application but i can't find out why it gives the error above ^^

This is my code:

const cors = require('cors');
const express = require('express');
const bodyParser = require('body-parser');




const server = express();
const port = 3000 || process.env.PORT;

server.options('*', cors());
server.use(bodyParser.json());
server.use(bodyParser.urlencoded({ extended: false }));

const jwt = require('jsonwebtoken');


 server.listen(port, () => {
    console.log(`Server is running on port ${port}`);
});


const posts = [
    {
        user: 'david',
        title: 'post'
    },
    {
        user: 'bryan',
        title: 'post2'
    }
];



server.get('/posts', authenticateToken, (req, response) => {
 response.json(posts.filter(post => post.user === req.user));
});

server.post('/login', (req, res) => {
    const {username, password} = req.body;
    if(username == null) return res.sendStatus(401);

    jwt.sign(username, 'test', (err, token) => {
        if(err) {
            console.log(err);
            return res.sendStatus(403);
        }
    
        console.log(accessToken);
        res.json({accessToken: accessToken});
    });
 });
  
   


function authenticateToken(req, res, next) {
    const authHeader = req.headers['authorization'];
    const token = authHeader && authHeader.split(' ')[1];

    if(token == null) return res.sendStatus(401);
    jwt.verify(token, 'test', (err, user) => {
        if(err) return res.sendStatus(403);
        req.user = user;
        next();
    });
}

I cannot find a solution on any website.

Upvotes: 2

Views: 6438

Answers (3)

92lexus
92lexus

Reputation: 706

I had the same issue. The issue being that version 9.0.0 of the jsonwebtoken package does not support node version 11 and below, so I solved it by downgrading the version of the jsonwebtoken package.

I did so by changing the jsonwebtoken dependency from 9.0.0 to 8.5.1 inside the package.json file, then I ran npm update inside my terminal.

Upgrading your node version might be recommended here, but I haven't quite managed to update my node version because of an npm issue, so this is only a workaround.

Checkout the following article explaining the migration from v8 to v9 of the jsonwebtoken package. https://github.com/auth0/node-jsonwebtoken/wiki/Migration-Notes:-v8-to-v9

Upvotes: 0

David
David

Reputation: 31

I updated the node version on the server and it fixed the error.

Upvotes: 1

Albert Baucells
Albert Baucells

Reputation: 59

I had the same problem. I found out that the problem appeared when running the npm audit fix command to get rid of the vulnerabilities.

The process updated passport module and that seemed to be the cause of the problem. I went back to the settings before applying the fix and everything worked fine again.

Diff:

"passport": "~0.2.0",
"passport": "^0.6.0",

"passport-jwt": "^4.0.0",
"passport-jwt": "^4.0.1",

Fairly old node version: 10.16.0

I hope it helps

Upvotes: 1

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