JWT Decode & Key Inspect
Decode JWT locally and inspect PEM, JWK, or certificate key material without performing signature verification.
Decode JWT headers, payload claims, and timing fields locally in your browser, and inspect PEM, JWK, or certificate key material in the same page.
Useful for API debugging, auth troubleshooting, checking token contents, and reviewing key structure. Signature verification is not performed.
Decode JWT header/payload/time claims for debugging only. Signature is NOT verified.
Paste a PEM public/private key, certificate, JWK, or JWK Set to inspect algorithms, thumbprint, and PEM/JWK structures.
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Common use cases
- Use this page when debugging login flows, API authorization, or third-party callbacks and you need to inspect JWT headers, payloads, and expiry values quickly.
- It is useful when you receive a token and want to see issuer, audience, timestamps, or claims before doing deeper server-side validation.
- If you are checking PEM, JWK, or certificate-related content and just need a fast structural look, this page is a convenient first step.