JWT Decoder
Decode and inspect JWT tokens instantly. No server-side processing.
Privacy & Security
This tool decodes JWTs locally in your browser. Tokens are never sent to a server.
What is a JWT Decoder?
A JWT (JSON Web Token) Decoder is a tool that decodes and displays the contents of a JWT token. JWTs are commonly used for authentication and information exchange in web applications. Our decoder splits the token into its three parts: header, payload, and signature.
This tool performs all decoding locally in your browser, ensuring your tokens remain private and secure. No data is ever sent to our servers.
Who Should Use This Tool?
- Developers debugging authentication issues
- Security professionals inspecting JWT tokens
- API developers testing token-based authentication
- Anyone learning about JWT structure and format
Common Use Cases
- Debugging authentication errors in web applications
- Inspecting token expiration times and claims
- Verifying token structure and format
- Understanding JWT anatomy for educational purposes
- Checking token permissions and user roles
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