Categories

← View All Tools

JWT Generator

Generate JWT tokens with custom claims and algorithms

Key Facts

Category
Security
Input Types
text, select, number, textarea, checkbox
Output Type
text
Sample Coverage
4
API Ready
Yes

Overview

The JWT Generator is a secure utility designed to create JSON Web Tokens (JWT) for authentication and data exchange. It allows developers to define custom claims, select signing algorithms, and set token expiration times, ensuring precise control over your application's security credentials.

When to Use

  • •Testing authentication flows in your web or mobile applications.
  • •Generating temporary access tokens for API development and debugging.
  • •Creating secure tokens with specific claims for microservices communication.

How It Works

  • •Enter a strong secret key to sign your token securely.
  • •Select your preferred HMAC algorithm (HS256, HS384, or HS512).
  • •Define standard claims like issuer, audience, and subject, or add custom JSON claims.
  • •Configure optional settings like expiration time and standard timestamps, then generate the encoded token.

Use Cases

Simulating user authentication states during frontend development.
Verifying backend API endpoints that require valid Bearer tokens.
Generating short-lived tokens for secure inter-service authorization.

Examples

1. API Development Auth Token

Backend Developer
Background
A developer needs to test a protected API endpoint that requires a valid JWT with a specific user ID.
Problem
Manually constructing a signed JWT is error-prone and time-consuming.
How to Use
Input a secure secret, set the subject to the user ID, and add a custom role claim.
Example Config
Secret: 'my-super-secret-key', Subject: 'user_123', Custom Claims: '{"role": "admin"}'
Outcome
A fully signed JWT is generated, ready to be used in the Authorization header for API testing.

2. Token Expiration Testing

QA Engineer
Background
The QA team needs to verify that the application correctly rejects expired tokens.
Problem
Need a token that expires in exactly one minute to test the timeout logic.
How to Use
Set the 'Expires In' field to 60 seconds and generate the token.
Example Config
Expires In: 60, Algorithm: HS256
Outcome
A valid token is produced that will automatically fail validation after 60 seconds, allowing for quick verification of expiration handling.

Try with Samples

json
JWT Samples
Comprehensive JWT examples from basic token structure to advanced security implementations
title token jwt
json
PDF Samples
Generated PDF samples from tools dated 2026-02-01 to 2026-02-10
preferred input family json
json
Hex/Unicode Encoding Format Samples
Examples of hex (\xXX) and unicode (\uXXXX) escape sequence encoding formats
preferred input family json
json
WebRTC Real-Time Communication Samples
Comprehensive WebRTC samples for peer-to-peer audio/video communication, data channels, screen sharing, and signaling server implementation
preferred input family json
json

Related Hubs

Json Generate Tools
Explore 33 json tools for generate workflows and compare closely related utilities quickly.
Json Convert Tools
Explore 100 json tools for convert workflows and compare closely related utilities quickly.
Json Tools
Explore 43 json tools for utility workflows and compare closely related utilities quickly.
Json Format Tools
Explore 6 json tools for format workflows and compare closely related utilities quickly.

FAQ

Is my secret key stored on your servers?

No, this tool operates locally in your browser. Your secret key and token data are never transmitted or stored.

Which algorithms are supported?

The generator supports HMAC SHA-256 (HS256), HMAC SHA-384 (HS384), and HMAC SHA-512 (HS512).

Can I add custom data to the token?

Yes, you can include additional information in the 'Custom Claims' field using valid JSON format.

What is the purpose of the 'Expires In' field?

It sets the 'exp' claim, defining the duration in seconds after which the token will be considered invalid.

Are these tokens production-ready?

While the tokens are cryptographically valid, ensure you use a sufficiently long and complex secret key for production environments.

API Documentation

Request Endpoint

POST /en/api/tools/jwt-generator

Request Parameters

Parameter Name Type Required Description
secret text Yes -
algorithm select No -
issuer text No -
audience text No -
subject text No -
expiresIn number No -
customClaims textarea No -
includeJti checkbox No -
includeIat checkbox No -
includeNbf checkbox No -

Response Format

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}
Text: Text

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-jwt-generator": {
      "name": "jwt-generator",
      "description": "Generate JWT tokens with custom claims and algorithms",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=jwt-generator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]