Developer Utility

JWT Generator

Enter Header, Payload, and Secret values to generate an HS256 JWT token and inspect its Header, Payload, and Signature structure at a glance.

Create JWT Enter Header and Payload JSON to generate a test JWT token.

HS256 Support Supports the HMAC SHA-256 signing method commonly used in development testing.

Token Structure Check the generated token separated into Header, Payload, and Signature sections.

Algorithm HS256

Header Waiting

Payload Waiting

Secret Waiting

JWT Input

Enter Header JSON, Payload JSON, and Secret Key, then generate a JWT.

Security Notice

This page is a JWT generation tool for development testing. Do not enter production Secret Keys, admin tokens, or Payloads containing personal information.

Header JSON Header waiting

Payload JSON Payload waiting

Secret Key Secret waiting

Enter only a test Secret. Real production secret keys should be managed securely on the server.

Common Payload Claims

sub: User or subject identifier
name: User name or display name
iat: Token issued time
exp: Token expiration time

Warning

JWT Payload can be easily decoded, so avoid including sensitive values such as passwords, resident numbers, or API keys.

Generated Result

Check the generated JWT token and its Header, Payload, and Signature structure.

Ready

JWT Token

JWT generation result will appear here.

Header

Payload

Signature

Help

What is a JWT Generator?

A JWT Generator is a developer utility that creates a JSON Web Token from Header, Payload, and Secret values. It can be used for API authentication testing, learning login token structure, and checking authentication flows between frontend and backend.

How is a JWT structured?

A JWT consists of three parts: Header, Payload, and Signature. The Header contains the algorithm and token type, the Payload contains claim information such as user ID, issued time, and expiration time, and the Signature is generated by signing the Header and Payload with the Secret Key.

Supported Features

Generate HS256 JWT
Enter and format Header JSON
Enter and format Payload JSON
Generate random Secret
Display JWT Header, Payload, and Signature separately
Copy generated token

Important Notes

This tool is provided for development testing and learning. Do not enter production Secret Keys, admin tokens, or Payloads containing personal information. Security-sensitive tokens should be generated and managed safely in a server environment.

Is the JWT Payload encrypted?

A typical JWT Payload is not encrypted. It is Base64URL encoded, so anyone can decode and read it. Avoid putting sensitive information in the Payload.

What is HS256?

HS256 is a JWT algorithm that signs the Header and Payload with a Secret Key using HMAC SHA-256. It is commonly used for testing and single-server environments.