What is JWT Decoder?
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. JWTs consist of three parts separated by dots: Header, Payload, and Signature. Decoding parses the Base64URL-encoded Header and Payload objects.
How to use this tool
- Paste your encoded JWT string (eyJhbG...) into the input box.
- Review the automatically decoded Header and Payload JSON structures.
- Check token status, issued date (iat), and expiration timestamp (exp).
Common Use Cases
- Debugging authorization headers and OAuth user scopes.
- Checking token expiration dates during frontend auth integration.
- Inspecting custom claims and user roles attached to bearer tokens.
Frequently Asked Questions
Does decoding a JWT verify its signature?
No. Decoding simply parses the Base64URL string into readable JSON. To verify signature authenticity, the token must be validated against the issuer secret or public RSA key.
Is it safe to paste sensitive JWTs into DevForge?
Yes. DevForge runs 100% in your local browser window. Tokens are never stored, logged, or sent across network requests.