JWT Token

ℹ️ Enter a JWT token to decode

🔐 JWT Decoding Tips

📋 JWT Basics

  • Three parts: Header, Payload, Signature separated by dots
  • Base64URL encoded: Each part is encoded separately
  • JSON format: Header and payload contain JSON data
  • Stateless: Self-contained tokens with all necessary information
  • Compact: Designed for URL-safe transmission

🛡️ Security Considerations

  • Signature verification: Always verify JWT signatures on server
  • Algorithm validation: Ensure expected algorithm is used
  • Expiration checks: Validate exp claim to prevent replay attacks
  • Audience validation: Check aud claim matches your application
  • Secure transmission: Use HTTPS to prevent token interception

🎯 Best Practices

  • Short expiration: Use reasonable exp times (15-60 minutes)
  • Refresh tokens: Implement refresh token rotation
  • Minimal payload: Keep payload small and avoid sensitive data
  • Strong algorithms: Use RS256 or ES256 for production
  • Token revocation: Implement blacklisting for compromised tokens