JWT Décodeur
Decode a JSON Web Token’s header and payload locally.
Decoding is not verification: anyone can read a JWT, only its signature proves it wasn’t tampered with. Signature verification requires the secret or public key and is deliberately not attempted here — never paste production tokens from a live site into any web tool.
Comment utiliser
- Tout s’exécute localement dans votre navigateur : aucune donnée n’est envoyée, aucun compte requis.
À propos
Paste a JWT to see its decoded header and payload, with exp/iat timestamps shown as readable dates and a live “valid for X” status.
Decoding only reveals claims — it does not verify the signature. Never rely on a decoded token without signature verification on your server, and never paste a production token from a live system into a web tool.
Tout s’exécute localement dans votre navigateur : aucune donnée n’est envoyée, aucun compte requis.
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