Paste any JSON Web Token to instantly decode its header, payload claims, and check expiration time — 100% client-side, your token is never sent to any server.
🚀 Launch Free Tool →✅ Decode header, payload & signature
✅ Expiry (exp) date display
✅ iat / nbf timestamp human-readable
✅ Color-coded claim types
✅ 100% client-side — token never sent anywhere
This tool decodes JWTs entirely in your browser — your token is never sent to any server. However, avoid pasting production tokens with sensitive user data unnecessarily.
JWT signature verification requires your server's secret key. This tool decodes the header and payload (which are Base64-encoded, not encrypted) without verifying the signature.
The 'exp' (expiration time) claim is a Unix timestamp indicating when the token expires. Requests made with an expired JWT will be rejected by the server.