JWT Generator

Generate JSON Web Tokens with custom header, payload, and secret key.

Demo Tool Warning

This is a simplified JWT generator for educational purposes. For production use, implement proper HMAC-SHA256 signing using a crypto library like jsonwebtoken or jose. Never store secrets in client-side code.

About JWT

Common Claims

  • iss - Issuer
  • sub - Subject
  • aud - Audience
  • exp - Expiration Time
  • nbf - Not Before
  • iat - Issued At
  • jti - JWT ID

Algorithms

  • HS256 - HMAC SHA-256 (symmetric)
  • RS256 - RSA SHA-256 (asymmetric)
  • ES256 - ECDSA SHA-256 (asymmetric)
  • PS256 - RSA-PSS SHA-256

Production Best Practices

  • ✓ Use strong secret keys (at least 256 bits)
  • ✓ Always set expiration time (exp claim)
  • ✓ Store secrets securely (environment variables, not in code)
  • ✓ Use HTTPS for token transmission
  • ✓ Implement token refresh mechanism
  • ✓ Validate tokens on every request
  • ✓ Use libraries like jsonwebtoken (Node.js) or jose (browser)