Validating a JWT token from Auth0 with Next.js backend involves a few steps:

Step 1.  You will need to install the following dependencies:

jwks-rsa to retrieve the public key from Auth0

You can install these dependencies using the following command:

Create a middleware function that will handle the validation of the JWT token. This middleware function will verify the JWT token using the public key provided by Auth0.

  jwksUri: 'https://your-auth0-domain.auth0.com/.well-known/jwks.json'

  client.getSigningKey(header.kid, function(err, key) {

    const signingKey = key.publicKey || key.rsaPublicKey;

  const token = req.headers.authorization?.split(' ')[1];

    return res.status(401).send({ message: 'Missing token' });

  jwt.verify(token, getKey, {}, (err, decoded) => {

      return res.status(401).send({ message: 'Invalid token' });

Now, you can use the middleware function in your Next.js backend to protect routes that require authentication.

const authMiddleware = require('./authMiddleware');

app.get('/api/protected', authMiddleware, (req, res) => {

  res.send({ message: 'This route is protected' });

In this example, the authMiddleware function will be called before the route handler. If the JWT token is valid, the middleware function will set the decoded token in the req.user property, which can then be accessed by the route handler.

Note that you will need to replace https://your-auth0-domain.auth0.com with your actual Auth0 domain. You can find your domain in your Auth0 dashboard.

To obtain the JWT token, your front-end application will need to authenticate with Auth0 and receive a token in response. This can be done using one of the Auth0 SDKs or by manually making an HTTP request to the Auth0 API.

Assuming that you are using the Auth0 SDK for JavaScript, you can obtain the JWT token as follows:

import createAuth0Client from '@auth0/auth0-spa-js';

const token = await auth0.getTokenSilently();

In this example, createAuth0Client is used to create an instance of the Auth0 SDK, and getTokenSilently is used to obtain the JWT token.

Step 5. Include the JWT token in the request:

To include the JWT token in the request to the Next.js backend, you will need to add it to the Authorization header. You can do this using the fetch API or any other HTTP client of your choice.

const response = await fetch('/api/protected', {

In this example, the fetch API is used to make a request to the /api/protected route, and the JWT token is included in the Authorization header as a Bearer token.

That's it! With these steps, you should now be able to validate a JWT token from Auth0 with your Next.js backend.

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