Decode and inspect JSON Web Tokens (JWT) with our free JWT Parser. Paste any JWT to see its header, payload, and signature components with proper formatting. Verify token expiration, inspect claims, and debug authentication issues. Essential for developers building OAuth, SSO, and API authentication systems.
Paste your JWT token in the input field.
The header and payload are decoded instantly.
View all claims including expiration time and issuer.
Check if the token is expired based on the exp claim.
A JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and authorization. It contains three Base64-encoded parts: header (algorithm info), payload (claims/data), and signature (verification). It's the standard for modern API authentication.
All decoding happens in your browser - tokens are never sent to any server. However, JWTs often contain sensitive data. In production, never share tokens publicly and always use HTTPS.
This tool decodes and displays JWT contents. Full signature verification requires the secret key (HMAC) or public key (RSA/ECDSA), which would need to be entered separately.