Security & Auth

JWT Debugger

Inspect JWT header and payload content, verify structure, and speed up authentication debugging without leaving your browser workflow.

Interactive JWT Debugger

Decode header and payload instantly. Add an HMAC secret to verify HS256 signatures.

Common use cases

  • Read token claims while testing login flows.
  • Check token expiration and issuer values quickly.
  • Validate token structure before backend integration tests.

Quick start

  1. Paste a JWT token string.
  2. Review decoded header and payload.
  3. Verify expiry and critical claims before deployment.

Related guides

Understanding JWT: How to Safely Decode and Verify Your TokensSecure Your Web App: Essential Security Checklists for Developers

FAQ

Does this tool verify JWT signatures?

Yes. HS256 signatures can be verified by providing the shared secret in the debugger.

Can I use it for expired tokens?

Yes. Decoding still works for expired tokens so you can inspect claims and troubleshoot auth issues.

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