Understanding JWT: A Guide for Developers

JSON Web Tokens (JWT) are an open, industry standard RFC 7519 method for representing claims securely between two parties.

Structure of a JWT

A JWT typically consists of three parts separated by dots:

1. Header: Contains the type of token and the hashing algorithm.
2. Payload: Contains the claims (user data, permissions, etc.).
3. Signature: Used to verify that the sender of the JWT is who it says it is.

Decoding JWTs

You can use our JWT Decoder to inspect the contents of any token without needing a secret key. This is incredibly useful for debugging authentication issues.

Security Tip

Never store sensitive information like passwords in the JWT payload, as it is only Base64 encoded and can be easily decoded by anyone.