Thread by @csaba_kissi

What is JSON Web Token, and how it works for API authentication? 👇

A JSON-based open standard called JSON Web Token (JWT) is used to create access tokens that make a number of claims.

When using JWT authentication, a token is generated, signed by the server, and sent to the client.

The client then provides this token to the server with each subsequent request to demonstrate user authentication.

How the authentication process works:

The client asks the server to log them in using their credentials (username and password).

If the credentials are legitimate, the server generates a JWT that includes the user's ID, name, and roles, among other assertions.

The JWT is signed with a secret key that only the server knows.

This signature guarantees that the token was not tampered with.

The JWT is then sent to the client.

The client stores the JWT safely, like an HTTP-only cookie or the browser's local storage.

The client sends the JWT in the "Authorization" header of each subsequent request to the server.

If the signature is wrong or the claims are no longer true, the server sends the message "401 Unauthorized."

The server checks that the claims in the JWT are still valid by using the same secret key to verify the JWT's signature.

The server lets the request go through if the signature and the claims are still valid.

Because JWTs are stateless, the server is not required to keep track of a session or save user information.

As a result, it is simple to scale and more secure because session hijacking cannot occur.

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