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JWT Generator

Sign JSON Web Tokens with HMAC SHA-256/384/512

Header JSON
Payload JSON
Algorithm & Secret
Generated JWT
Click "Sign & Generate JWT" to produce a token

About JWT signing

  • HS256/HS384/HS512 are HMAC algorithms — they use a single shared secret for both signing and verification
  • The header's alg field must match the algorithm you pick — this tool auto-syncs it
  • Common payload claims: iat (issued at), exp (expiration), nbf (not before), sub (subject), iss (issuer), aud (audience), jti (JWT ID)
  • All signing runs in your browser via Web Crypto API — secrets never leave your computer

Use cases

  • Generate test tokens for API authentication during development
  • Reproduce a specific token shape for debugging auth issues
  • Create signed tokens for integration tests