API Testing: JSON Web Token (JWT)

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According to RFC Standard 7519, JSON Web Token is pronounced as "Jot".

JWT is used to represent as self-contained session of authenticated user and the roles of the user.

It has set of claims that encodes users identity, users permission and digitally signed to protect the content.


Example of JSON Web Token:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

It has three parts and separated by two dots.

First Part:  Header

Second Part: Payload

Third Part: Signature

JSON Web Token Decoder: https://jwt.io/  


Understanding the Decoded Information:

Header: Algorithm and Token Type
Payload: Data 
    Sub is compulsory: To whom the token refers to
    iat    : Issued at Time.






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