How does JWT work?

How does JWT work?

How does JWT work?

The operating principle of JWT The user connects from your client which will send an HTTP request to the server (via the server’s API) with, for example, an email/password pair. If the login information is correct, the server generates a token JWT.

How to generate a JWT token?

Generation of a JWT

  1. To sign a JWT, select the signature algorithm and cryptographic artifact. For information on key requirements, see RFC 7518: JSON Web Algorithms (JWA). …
  2. To encrypt a JWTselect an encryption algorithm and a key management algorithm.

How to store token of a request?

If the token is stored in this way, it must be systematically included in the requests sent to the server, for example via the “Authorization: Bearer” header. This solution is therefore ideal for applications mainly Frontend in Javascript and where it works mainly with AJAX requests.

What is a token signature?

A “Signature” part, which corresponds to the concatenation of the “Header” and “Payload” parts encrypted with the private key. Here is an example of a JWT token: In this second part, it is possible to enter a lot of information, such as the user name or his rights for example.

How are tokens signed?

To do this, the information in the token is signed using a private key held by the server. When it receives the token again, the server will only have to compare the signature sent by the client and the one it has generated with its own private key and compare the results.

What is JSON Web Token?

JSON Web Tokens or JWTs are tokens generated by a server when authenticating a user on a web application, and which are then transmitted to the client. They will be sent back with each HTTP request to the server, allowing it to identify the user.