How do different authentication libraries compare?

What are the main differences between OAuth and JWT for authentication?

OAuth is an authorization framework, while JWT (JSON Web Token) is a token format. OAuth allows third-party services to exchange information without sharing credentials, whereas JWT is used to securely transmit information between parties as a JSON object.

Which library would you recommend for a Node.js application?

For Node.js, I recommend using Passport.js for its flexibility and support for various authentication strategies, including OAuth and JWT.

Are there any security concerns I should be aware of?

Yes, common concerns include token expiration, secure storage of tokens, and ensuring that your implementation follows best practices to prevent vulnerabilities like token theft.

Can you give me an example of how to implement JWT in a web app?

Sure! You can use libraries like jsonwebtoken in Node.js. First, install it using npm, then create a token with user information and send it to the client after successful login.