About JWT Decoder
JWT Decoder is a simple, free tool to decode JSON Web Tokens (JWTs). Whether you're a developer debugging authentication tokens or a security professional analyzing claims, this tool makes it easy to decode and understand JWTs in seconds.
How to Use
- Paste Your JWT: Copy and paste your token into the input box.
- Click Decode: Hit the "Decode JWT" button to see the decoded header and payload.
- Analyze: Review the decoded information in a clear, readable format.
Why Use JWT Decoder?
- Fast & Easy: Decode JWTs instantly with no setup required.
- Secure: Your data stays in your browser—no server-side processing.
- Free Forever: No sign-ups, no fees, just a simple tool for everyone.
What is a JWT?
A JSON Web Token (JWT) is a compact way to securely transmit information between parties. It consists of three parts:
- Header: Contains the token type and signing algorithm.
- Payload: Holds the claims (e.g., user data, permissions).
- Signature: Ensures the token hasn't been tampered with.