JWT Encoder

Create and sign JWT tokens with custom payload and secret

⚠️ Keep your secret key secure. Never share it publicly.

⚠️ Note: This is a simplified JWT encoder for demonstration. For production use, implement proper HMAC signing with a crypto library like crypto-js or use a backend service.

What is a JWT Encoder?

A JWT Encoder is a tool that creates and signs JSON Web Tokens (JWT) with a custom payload and secret key. JWTs are used for authentication and secure information exchange between parties. This encoder allows you to generate tokens with custom claims and sign them using HMAC algorithms (HS256, HS384, HS512).

How to Use the JWT Encoder

  1. Select the signing algorithm (HS256, HS384, or HS512)
  2. Customize the header if needed (algorithm and type)
  3. Add your payload data (user info, permissions, expiration)
  4. Enter your secret key for signing
  5. The JWT token is generated automatically
  6. Copy the token for use in your application

Common JWT Claims

  • sub (Subject): User ID or identifier
  • exp (Expiration): Token expiration timestamp
  • iat (Issued At): Token creation timestamp
  • nbf (Not Before): Token valid from timestamp
  • iss (Issuer): Who created the token
  • aud (Audience): Who the token is for

Benefits

  • ✅ Create JWT tokens instantly
  • ✅ Support for multiple HMAC algorithms
  • ✅ Add standard claims with one click
  • ✅ View token structure (header, payload, signature)
  • ✅ Copy tokens easily
  • ✅ Test authentication flows

🔧 Related Tools

→ JWT Decoder→ Base64 Converter→ Hash Generator