JWT Decoder

This free online JWT (JSON Web Token) decoder allows you to decode and inspect JWT tokens instantly in your browser. Paste any JWT token to view its header, payload, and signature components with syntax highlighting and detailed claim information.

The decoder automatically validates the token structure, checks expiration status, and provides a comprehensive breakdown of all claims. Standard JWT claims like issuer (iss), subject (sub), audience (aud), expiration (exp), not before (nbf), issued at (iat), and JWT ID (jti) are automatically identified with descriptions. Timestamp claims are displayed in both Unix format and human-readable dates.

Perfect for developers debugging authentication issues, inspecting access tokens, validating JWT structure, or understanding token contents. All decoding happens entirely in your browser using native JavaScript - no server requests, no data storage, completely private and secure. Note: This tool only decodes JWTs; it does not verify signatures (signature verification requires the secret key).