JWT Token Decoder
Decode JWT Tokens
Decode and inspect JSON Web Tokens to debug authentication issues and understand token structure. All decoding happens in your browser.
Frequently Asked Questions
Is it safe to decode JWTs here?
Yes, all JWT decoding happens in your browser - no data is sent to our servers. However, never paste production tokens with sensitive data. For production debugging, use our API testing tools in a secure environment.
Can this tool verify JWT signatures?
No, this tool only decodes JWT tokens to view their contents. Signature verification requires the secret key and should be done server-side. Learn more about JWT security best practices.
What JWT claims are commonly used?
Common claims include 'iss' (issuer), 'sub' (subject), 'aud' (audience), 'exp' (expiration), 'iat' (issued at), and 'nbf' (not before). Custom claims are also supported for application-specific data.