JWT Decoder
Decode JWT (JSON Web Token) tokens to inspect their header, payload, and signature. All processing happens locally in your browser for maximum security.
Privacy FirstNo Server Required
JWT Token
About JWT Tokens
What is a JWT?
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.
JWT Structure
JWTs consist of three parts separated by dots: Header.Payload.Signature. Each part is Base64URL encoded.
Common Use Cases
- • Authentication and Authorization
- • Secure Information Exchange
- • Single Sign-On (SSO)
- • API Access Control
Privacy & Security
This tool processes JWTs entirely in your browser. No data is sent to any server, ensuring your tokens remain private and secure.
⚠️ Security Note
JWTs are not encrypted by default - they are only encoded. Never include sensitive information in JWT payloads unless properly encrypted. Always validate JWTs on the server side.