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Inspect header and payload from a JSON Web Token (JWS). Decoding runs locally in your browser. Signatures are never verified here - use your auth library with the correct secret or JWKS on the server.
Paste a Bearer token or raw JWT. We only Base64URL-decode segments; we do not call the network or store your token.
Enter a JWT to see the decoded header, payload, and signature material.
Everything runs locally. Nothing is uploaded.