JWT Validator
Validate JWT format, decode its header and payload, and inspect common claims such as exp, nbf, and iat.
JWT Validator tool
This tool validates structure and decodes the token locally. It does not verify the signature cryptographically.
| Metric | Value |
|---|
Privacy: JWT decoding runs locally in your browser. No token data is stored or transmitted.
Paste a JWT token and validate it. The tool checks the three-part structure, base64url-decodes the header and payload, and inspects standard claims.
This is useful for local inspection, but real signature verification requires the correct secret or public key.
Examples
- Header → often includes
algandtyp - Payload → may include
sub,iss,aud,exp,iat - Signature → present as the third segment, but not cryptographically verified here
FAQ
- What does this JWT validator check?
It checks JWT structure, decodes the header and payload, and inspects common claims such as exp, nbf, and iat.
- Does it verify the signature cryptographically?
No. This page validates structure and decodes the token but does not verify the JWT signature against a secret or public key.
- What if the token is expired?
The tool will flag the exp claim as expired based on your current browser time.
- Is my token stored?
No. Decoding and validation run locally in your browser.