JWT Decoder

About JWT Decoder

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This tool helps you decode and inspect JWT tokens without verification.

JWT Structure

• Header: Contains token type (JWT) and signing algorithm (HS256, RS256, etc.)
• Payload: Contains claims (user data, expiration, issuer, etc.)
• Signature: Verifies the token hasn't been tampered with

Common Use Cases

• User authentication and authorization
• API authentication (Bearer tokens)
• Single Sign-On (SSO) systems
• Secure data exchange between services
• OAuth 2.0 and OpenID Connect

Security Note

This tool only decodes JWT tokens - it does not verify signatures. Never share your secret keys publicly. JWT tokens should be transmitted over HTTPS and stored securely.