How can I implement authentication in a TypeScript application?

How can I implement authentication in a TypeScript application?

You can implement authentication in a TypeScript application using libraries like Passport.js or by creating your own JWT-based system.

What is JWT and how does it work for authentication?

JWT, or JSON Web Token, is a compact, URL-safe means of representing claims to be transferred between two parties. It allows you to verify the token's authenticity and the user's identity.

Can you show me a simple example of using JWT in TypeScript?

Sure! First, install the necessary packages: npm install jsonwebtoken @types/jsonwebtoken. Then, you can create a token like this: const token = jwt.sign({ userId: user.id }, 'your_secret_key');.

How do I verify the JWT in my application?

To verify a JWT, use jwt.verify(token, 'your_secret_key', (err, decoded) => { ... }); This checks the token's validity and decodes it.