JWT Decoder
Paste a JSON Web Token and instantly decode its header and payload into readable JSON, with timestamp claims like exp and iat translated into human dates. Decoding happens entirely in your browser — your token is never sent anywhere, so it's safe for real tokens.
- Decoded header & payload JSON
- Human-readable exp / iat / nbf
- Token expiry status
- 100% local — token never uploaded
How to use the JWT Decoder
- 01
Paste a token
Drop in your JWT (header.payload.signature).
- 02
Inspect claims
Read the decoded header and payload.
- 03
Check expiry
See whether the token is still valid.
- 04
Copy
Copy the decoded JSON if you need it.
Frequently asked questions
Does this verify the token's signature?+
No. This tool decodes the token so you can read its claims; it does not verify the signature, which requires the secret or public key. Never trust a decoded token's contents without verifying it server-side.
Is it safe to paste a real token here?+
Yes. Decoding runs entirely in your browser with no network requests, so your token never leaves your device. That said, treat live tokens carefully and avoid sharing your screen.
Need a custom tool or a mobile app? Let’s build it.
I’m a React Native & web developer in Karachi. These free tools are built with the same care I bring to client work.