Decode and inspect JSON Web Tokens (JWT). View header, payload, and signature without verification.
This free JWT decoder decodes and inspects JSON Web Tokens without verification. View the header (algorithm and token type), payload (claims and data), and signature. Perfect for debugging authentication issues and understanding JWT structure.
What is JWT? JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: Header (algorithm), Payload (claims), and Signature (verification).
Standard Claims: iss (issuer), sub (subject), aud (audience), exp (expiration time), nbf (not before), iat (issued at), jti (JWT ID). These are registered claims defined in RFC 7519.
Security Note: This tool only decodes JWTs. It does NOT verify signatures or validate tokens. Never paste sensitive production tokens into online tools. Use for development and debugging only.
Use Cases: Debugging authentication, inspecting token claims, understanding JWT structure, API development, OAuth/OpenID debugging, token expiration checking.