expressjsHow do I use Express.js and JWT to authenticate users?

To use Express.js and JWT to authenticate users, you will need to do the following steps:

1. Install the jsonwebtoken and express-jwt packages:

$ npm install jsonwebtoken express-jwt

2. Create a JWT secret key:

const jwtSecret = 'your_secret_key';

3. Create a middleware to check the JWT:

const jwtCheck = expressJwt({
    secret: jwtSecret
});

4. Use the middleware to protect routes:

app.get('/protected', jwtCheck, (req, res) => {
    res.send('Protected route');
});

5. Generate a JWT token:

const token = jwt.sign({ userId: 123 }, jwtSecret);

6. Pass the token to the client:

res.send({
    token: token
});

7. On subsequent requests, the client should include the token in the Authorization header:

Authorization: Bearer <token>

Helpful links

• jsonwebtoken
• express-jwt

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