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JWT Decoder

Decode and analyze JSON Web Tokens with advanced security insights and comprehensive token validation

🔒 Security Notice

⚠️ NEVER paste production tokens or tokens with real data

  • This tool runs entirely in your browser - no data is sent to servers
  • JWT tokens may contain sensitive information
  • Tokens are automatically cleared after 5 minutes for security
  • Only use for development/testing purposes

JWT Token Input

Paste your JWT token for secure decoding and analysis

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About JSON Web Tokens (JWT)

JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims between two parties. They're widely used for authentication, authorization, and secure information exchange in modern web applications.

JWT Structure

Header
Algorithm & token type metadata
Payload
Claims and user data
Signature
Cryptographic verification

Standard Claims

issToken issuer
subToken subject
expExpiration time
iatIssued at time
nbfNot before time

Common Algorithms

HS256HMAC SHA-256
RS256RSA SHA-256
ES256ECDSA SHA-256
PS256RSA-PSS SHA-256

Use Cases

  • • Authentication and session management
  • • API authorization and access control
  • • Secure information exchange
  • • Single sign-on (SSO) implementations
  • • Stateless application architectures

Security Best Practices

  • • Always verify tokens server-side
  • • Use strong secret keys and rotate regularly
  • • Set appropriate expiration times
  • • Never store sensitive data in tokens
  • • Implement proper token revocation