Developer Tools
JWT Decoder
Decode and inspect JWT (JSON Web Token) payloads without verifying signatures. Shows header, payload, and expiry information.
⚠️ Signatures are not verified. Do not use this for security validation.
How to use JWT Decoder
1
Paste your JWT token
Paste the full JWT token (three base64url parts separated by dots) into the input field.
2
View decoded header and payload
The header and payload sections are decoded and displayed as formatted JSON instantly.
3
Check expiry
If the token contains exp, iat, or nbf claims, the tool displays them and shows whether the token is expired.
Frequently Asked Questions
Are JWT signatures verified?
No. This tool only decodes the header and payload. Signature verification requires the secret key and should be done server-side.
Is my token sent to a server?
No. JWT decoding is done entirely in your browser — your token never leaves your device.