JWT Decoder OnlineDecode JWTs instantly in your browser with private, client-side processing.
JWT Token
0 charactersOverview
Decode JSON Web Tokens instantly with a free, online JWT decoder that runs entirely in your browser. Inspect the header and payload, read claims, and understand token structure without sending data to a server.
Developers use JWTs for authentication and authorization, and decoding them quickly is essential when debugging login flows or API access. This tool keeps everything client-side for privacy, so sensitive tokens never leave your device and results appear instantly with no registration.
Use it to sanity-check claims, compare token contents across environments, or understand which algorithm and key ID a service is using. It is a fast way to validate token shape before you move on to server-side signature verification.
- Decode header and payload with readable JSON output.
- View base64url segments and signature structure.
- Copy decoded JSON or raw segments instantly.
- Runs fully in-browser for private inspection.
How to Use
Decoding lets you quickly understand token contents before verifying signatures in your backend.
- Paste a JWT into the input field.
- Review the decoded header and payload sections.
- Copy JSON or individual segments as needed.
- Verify signatures separately in your backend.
Common Use Cases
JWT inspection helps validate claims and troubleshoot auth issues without extra tooling.
- Debugging authentication and authorization flows.
- Inspecting claims like exp, iat, and aud.
- Validating token structure during API testing.
- Reviewing issued tokens in staging environments.
FAQ
Does this verify JWT signatures?
No. It only decodes tokens. Always verify signatures on the server to ensure authenticity.
Is my token sent anywhere?
No. Decoding happens locally in your browser. The token never leaves your device.
Why do I see base64url?
JWT segments are base64url-encoded for safe transport in headers. That makes them URL-safe.