Decode any JSON Web Token and read its claims in plain language: expiry, not-before, issuer and audience. Spot unsigned alg "none" tokens and verify HS*, RS*, PS* and ES256 signatures locally in your browser.
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The JWT Debugger decodes a JSON Web Token and shows what is really inside it. Paste a token and the header and payload appear as readable JSON, followed by the registered claims in plain language: who issued the token, who it is meant for, when it was issued, when it becomes valid and when it expires. Expired tokens, tokens that are not valid yet and tokens without an exp claim are labelled immediately. If the header says alg "none", the tool warns you, because such a token carries no signature at all and anyone can change its payload. With a shared secret or a PEM public key you can also verify HS256/384/512, RS256/384/512, PS256/384/512 and ES256/384/512 signatures. Everything runs in your browser: token and key are never uploaded. The tool does not create or sign tokens and it cannot fetch an issuer key set (JWKS) for you.
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Nutzung auf eigene Gefahr. Diese Tools werden kostenlos und ohne Gewährleistung für Richtigkeit, Vollständigkeit, Verfügbarkeit oder Eignung für einen bestimmten Zweck bereitgestellt; Ergebnisse sind keine professionelle Beratung. Die gesetzliche Haftung — insbesondere für Vorsatz, grobe Fahrlässigkeit sowie für Verletzungen von Leben, Körper oder Gesundheit — bleibt unberührt.
Use at your own risk. These tools are provided free of charge without any warranty of accuracy, completeness, availability or fitness for a particular purpose; results are not professional advice. Statutory liability — in particular for intent, gross negligence and injury to life, body or health — remains unaffected.
Uso bajo su propio riesgo. Estas herramientas se ofrecen de forma gratuita y sin garantía de exactitud, integridad, disponibilidad o idoneidad para un fin determinado; los resultados no constituyen asesoramiento profesional. La responsabilidad legal — en particular por dolo, negligencia grave y daños a la vida, el cuerpo o la salud — no se ve afectada.
Utilisation à vos propres risques. Ces outils sont fournis gratuitement, sans garantie d’exactitude, d’exhaustivité, de disponibilité ou d’adaptation à un usage particulier ; les résultats ne constituent pas un conseil professionnel. La responsabilité légale — notamment en cas de dol, de négligence grave et d’atteinte à la vie, au corps ou à la santé — reste inchangée.