ToolHub
Open Tool

JWT Generator

Generate JSON Web Tokens for testing

Developer Tools
Launch Tool All Tools

About This Tool

The JWT Generator is an online tool for quickly creating JSON Web Tokens, supporting HS256, HS384, and HS512 HMAC signing algorithms. Users can customize Header and Payload content, specify a signing secret, and leverage the Web Crypto API for cryptographically secure signature computation. All operations are performed locally in your browser — secrets and tokens are never uploaded to any server.

Key Features

Quick Preview

Use Cases

json security generator

Frequently Asked Questions

Which signing algorithms does the JWT Generator support?

It currently supports HS256, HS384, and HS512 HMAC symmetric signing algorithms. These use SHA-256, SHA-384, and SHA-512 hash functions respectively, suitable for most testing and development scenarios.

Can the generated JWT tokens be used in production?

This tool is primarily intended for development and testing purposes. For production environments, it is recommended to use server-side JWT libraries with asymmetric algorithms like RS256 for better security.

Will the signing secret be uploaded to a server?

No. All signature computation is performed locally using the browser's built-in Web Crypto API. Your secret and token content never leave your device, ensuring data security.

How do I customize the JWT Payload?

Simply edit the JSON object in the Payload input field. You can add standard claims (such as sub, iat, exp) and custom fields. The tool automatically validates the JSON format.

What do the three parts of a JWT token represent?

A JWT token consists of three dot-separated parts: Header, Payload, and Signature. The Header specifies the token type and signing algorithm, the Payload carries the claim data, and the Signature verifies the token's integrity and authenticity.