JWT Decoder
Decode and verify JWT tokens locally in your browser — nothing is sent.
JWT Token
Verify Signature
Optional. Verification happens in your browser using the Web Crypto API — the secret never leaves your computer.
How it works
- Paste a JWT token (or use the "Sample" button).
- See the decoded header, payload and dates instantly.
- Optional: enter the secret to verify the HMAC signature.
- Everything runs in your browser (atob + Web Crypto API). Tokens and secrets never leave your computer.
Paste a JWT token on the left to decode it. All processing happens on your computer.
Header
Payload
Token Dates
| Claim | Value | Date |
|---|
This token does not contain date claims (iat, nbf, exp).