Decode JWT Tokens
Decode and inspect JWT tokens locally. See claims, expiry, and header.
What is a JWT Token?
JWTs are compact JSON payloads used for authentication and authorization. This tool decodes the header and payload so you can inspect claims, algorithms, and expiry without sending the token anywhere.
Benefits: Decode JWTs instantly, inspect header and payload claims, check expiry timestamps, local-only processing.
Best for: API auth debugging, OAuth token inspection, JWT structure checks, and expiry verification.
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Browse Developer toolsQuestions before you use it
Is it safe to paste my JWT here?
Yes. This tool runs entirely in your browser, so your token is never transmitted to any server.
Can this tool verify JWT signatures?
This tool decodes the header and payload for inspection only. Signature verification requires the secret key, which should stay on your backend.
What is the difference between header, payload, and signature?
The header contains the algorithm and token type. The payload contains the claims (user data, expiry). The signature verifies the token has not been tampered with.