JWT Decoder

Decode and analyze JSON Web Tokens with detailed payload inspection, security validation, and expiration checking.

JWT Token Input

Enter your JSON Web Token to decode and analyze its contents

0 characters

Standard JWT Claims

Common claims found in JWT tokens and their meanings

issIssuer
The issuer of the JWT
subSubject
The subject of the JWT
audAudience
The recipients that the JWT is intended for
expExpiration Time
The expiration time on or after which the JWT must not be accepted
nbfNot Before
The time before which the JWT must not be accepted
iatIssued At
The time at which the JWT was issued
jtiJWT ID
A unique identifier for the JWT

JWT Security

  • • Tokens are decoded client-side for security
  • • No sensitive data is sent to external servers
  • • Signature verification requires the secret key
  • • Always validate tokens on your server
  • • Check expiration times before using tokens
  • • Use HTTPS for token transmission

Use Cases

  • • API authentication and authorization
  • • Debugging JWT-based authentication issues
  • • Inspecting token claims and metadata
  • • Verifying token expiration and timing
  • • Development and testing workflows
  • • Security auditing and token analysis

Professional JWT Token Analysis and Security Validation

JWT decoding tools are essential for API development, authentication debugging, and security analysis workflows. Professional JWT decoders enable developers to inspect token contents, validate claims, and troubleshoot authentication issues while maintaining security best practices for token handling and validation in modern web applications.

Security Applications:

  • API authentication debugging and token inspection workflows
  • Security auditing and vulnerability assessment for JWT implementations
  • Token claim validation and authorization rule verification
  • Development and testing of JWT-based authentication systems
  • Integration testing for OAuth 2.0 and OpenID Connect flows
  • Token lifecycle management and expiration monitoring

Professional Features:

  • Client-side decoding for maximum security and privacy
  • Comprehensive token validation including expiration checking
  • Detailed claim analysis with standard JWT claim reference
  • Algorithm and signature format identification
  • Time-based claim validation with human-readable formatting
  • Copy-to-clipboard functionality for development workflows

This tool provides enterprise-grade JWT analysis with professional security standards for developers, security engineers, and system administrators requiring reliable token inspection and validation for authentication system development and maintenance.