JWT Decoder

Decode, verify, and edit JSON Web Tokens (JWT)

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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 free JWT decoder helps you decode, verify, and understand JWT tokens instantly, making it essential for developers working with authentication, API security, and token-based authentication systems.

JWT Structure:

A JWT consists of three parts separated by dots (.), each Base64Url encoded:

  • Header: Contains metadata about the token, including the signing algorithm (e.g., HS256, RS256) and token type
  • Payload: Contains the claims (data) about the user or entity, including standard claims and custom claims
  • Signature: Used to verify that the token hasn't been tampered with and was issued by a trusted source

Common JWT Claims:

  • exp - Expiration time (Unix timestamp)
  • iat - Issued at time
  • sub - Subject (user ID)
  • iss - Issuer
  • aud - Audience
  • nbf - Not before time

Use Cases:

  • Authentication: Verify user identity and session tokens
  • API Authorization: Secure API endpoints with bearer tokens
  • Single Sign-On (SSO): Share authentication across multiple applications
  • Information Exchange: Securely transmit information between parties
  • Debugging: Inspect token contents during development

Features:

  • Decode JWT tokens instantly
  • View header and payload in formatted JSON
  • Highlight token structure and components
  • Display token expiration and validity
  • Copy decoded information to clipboard
  • No data sent to servers - all processing is local

This JWT decoder is completely free and works entirely in your browser. Your tokens are never sent to any server, ensuring maximum security and privacy.