Security Tools

JWT Generator

Generate, decode, and verify JSON Web Tokens. Customize the header, payload, and signing algorithm.

Generation Options

No keys generated

Algorithm Recommendations

HS256: 256-bit key. Suitable for most applications. Good balance of security and performance.
HS384: 384-bit key. Higher security for sensitive applications.
HS512: 512-bit key. Maximum security. Recommended for high-security environments.

Best Practices

  • Never share your secret key publicly
  • Store keys in environment variables, not in code
  • Use different keys for different environments
  • Rotate keys periodically for enhanced security
  • Use HS512 for maximum security requirements

About JSON Web Tokens

JSON Web Tokens (JWT) are a compact, URL-safe format for representing claims between two parties. Defined by RFC 7519, JWTs consist of three Base64-encoded sections: a header specifying the algorithm and token type, a payload containing claims (user identity, permissions, expiration), and a signature that verifies the token has not been tampered with.

JWTs are widely used for authentication in web applications, API authorization, and single sign-on (SSO) systems. This tool helps you generate tokens for testing, decode existing tokens to inspect their contents, and verify signatures against a known secret or public key.

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