JWT Decoder

Decode and analyze JSON Web Tokens (JWT) to inspect header, payload, and claims.

JWT Token Input
Paste your JWT token to decode and analyze
About JWT (JSON Web Token)

JWT Token Structure

A JWT (JSON Web Token) is composed of three Base64URL-encoded segments separated by dots: Header.Payload.Signature. This compact format enables secure, URL-safe transmission of claims between parties.

JWT Security & Verification

This free online JWT decoder tool only parses and displays token contents. Full signature verification requires the secret key or public certificate used to sign the JWT, ensuring end-to-end trust.

Privacy-First JWT Decoder

All decoding happens locally in your browser—no JWT data is transmitted to external servers. Use this client-side utility to inspect JWT claims safely and privately.

JWT Use Cases & Applications

JWTs power modern authentication (OAuth 2.0, OpenID Connect), API authorization, single sign-on (SSO), and secure information exchange across microservices and SPAs.