How do I implement JWT in a Node.js application?

How do I implement JWT in a Node.js application?

To implement JWT in a Node.js application, you can use the 'jsonwebtoken' package. First, install it using npm.

What are the steps to create a JWT?

You need to create a payload, sign it with a secret key, and then send the token to the client.

How do I verify the JWT on the server?

You can verify the JWT using the 'verify' method from the 'jsonwebtoken' package, passing the token and the secret key.

Can you show me a code example?

Sure! Here's a simple example:

const jwt = require('jsonwebtoken');

// Create a token
const token = jwt.sign({ userId: 123 }, 'your_secret_key');

// Verify a token
jwt.verify(token, 'your_secret_key', (err, decoded) => {
  if (err) {
    console.log('Token is invalid');
  } else {
    console.log('Decoded payload:', decoded);
  }
});