JWT Decoder
Paste a JSON Web Token to decode and inspect its header, payload, and signature. Everything runs client-side.
Header
Payload
Signature
How to Use
1. Paste your JWT token into the input
field above. The decoder accepts tokens in the standard
header.payload.signature format.
2. Inspect the decoded output. The header shows the algorithm and token type. The payload contains claims like issuer, subject, audience, and expiration.
3. Check token validity. If the token has
an exp claim, the decoder shows whether
it is expired, valid, or not yet valid. Timestamps are converted to human-readable
dates.
4. Copy individual sections using the Copy buttons next to each decoded section.
This tool does not verify JWT signatures — it only decodes the Base64url-encoded content. No data leaves your browser.