What is JWT authentication and how it works?

In short, JWTs are used as a secure way to authenticate users and share information . Typically, a private key, or secret, is used by the issuer to sign the JWT. The receiver of the JWT will verify the signature to ensure that the token hasn’t been altered after it was signed by the issuer.

To authenticate a user, a client application must send a JSON Web Token (JWT) in the authorization header of the HTTP request to your backend API . API Gateway validates the token on behalf of your API, so you don’t have to add any code in your API to process the authentication.

JWTs can be used as an authentication mechanism that does not require a database . The server can avoid using a database because the data store in the JWT sent to the client is safe.17 Haz 2021