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express-jwt

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express-jwt

JWT authentication middleware.


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398K
decreased by-8.56%
Maintainers
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What is express-jwt?

The express-jwt package is a middleware for Express.js that allows you to validate JSON Web Tokens (JWTs) in your HTTP requests. It is commonly used for securing routes and ensuring that only authenticated users can access certain endpoints.

What are express-jwt's main functionalities?

JWT Validation

This feature allows you to validate JWTs in incoming requests. The middleware checks the token's validity and ensures it is signed with the correct secret key and algorithm.

const express = require('express');
const jwt = require('express-jwt');
const app = express();

const jwtMiddleware = jwt({
  secret: 'your-secret-key',
  algorithms: ['HS256']
});

app.use('/protected', jwtMiddleware, (req, res) => {
  res.send('This is a protected route');
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Error Handling

This feature allows you to handle errors that occur during JWT validation. For example, you can send a 401 Unauthorized response if the token is invalid.

const express = require('express');
const jwt = require('express-jwt');
const app = express();

const jwtMiddleware = jwt({
  secret: 'your-secret-key',
  algorithms: ['HS256']
});

app.use('/protected', jwtMiddleware, (err, req, res, next) => {
  if (err.name === 'UnauthorizedError') {
    res.status(401).send('Invalid token');
  } else {
    next(err);
  }
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Token Decoding

This feature allows you to decode the JWT and attach the payload to the request object. You can then access the decoded information in your route handlers.

const express = require('express');
const jwt = require('express-jwt');
const app = express();

const jwtMiddleware = jwt({
  secret: 'your-secret-key',
  algorithms: ['HS256'],
  requestProperty: 'auth'
});

app.use('/protected', jwtMiddleware, (req, res) => {
  res.send(`Hello, ${req.auth.name}`);
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

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Package last updated on 06 Feb 2023

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