JWT Generator

Generate custom JSON Web Tokens with comprehensive algorithm support, custom claims configuration, and secret key management for authentication and authorization systems. This security tool supports multiple JWT algorithms, payload customization, expiration settings, and token validation with decoding capabilities. Perfect for API authentication, security testing, JWT learning, and developing token-based authentication systems that provide secure user authentication and authorization.
Multiple JWT Algorithms Custom Claims Expiration Settings Token Validation
SECURE
Protected Connection
{ "sub": "1234567890", "name": "John Doe" }
{ "exp": 1719999999, "iat": 1719913599 }
{ "role": "admin", "permissions": ["read", "write"] }
Trust Score
5.0

JWT Generator Guide

What is JWT?

JSON Web Tokens (JWT) are a secure way to transmit information between parties as a JSON object. They're commonly used for authentication and information exchange in web applications.

How to Use:
  • Choose an algorithm (HS256 recommended)
  • Enter a secret key for signing
  • Add claims (key-value pairs)
  • Generate your JWT token
Common Claims:
iss
Issuer
sub
Subject
exp
Expiration
iat
Issued At
Token Configuration
HS256 is the most widely supported algorithm
Keep this secret safe! It's used to sign and verify your tokens
Generated Token & Preview
Click "Generate JWT Token" to create your token...
No token generated yet
No token generated yet
Token Structure

A JWT consists of three parts separated by dots (.):

Header
Algorithm & Type
Payload
Claims & Data
Signature
Verification
Implementation Examples
JavaScript Usage
// Send token in Authorization header
fetch('/api/protected', {
  headers: {
    'Authorization': 'Bearer ' + yourJwtToken
  }
});
PHP Usage
// Get token from header
$token = $_SERVER['HTTP_AUTHORIZATION'];
$token = str_replace('Bearer ', '', $token);

// Verify token (use JWT library)
$decoded = JWT::decode($token, $secret, ['HS256']);

Practical Applications & Use Cases

API Development & Testing

Generate test tokens for API development

  • Create tokens with custom claims
  • Test different user roles
  • Simulate expired tokens
  • Generate refresh tokens
Pro Tip: Create a set of test tokens for different user scenarios

Authentication System Setup

Configure and test JWT-based auth systems

  • Define claim structure
  • Set expiration policies
  • Configure algorithms
  • Test token validation
Pro Tip: Start with HS256 for development, use RS256 for production

Microservices Authentication

Implement service-to-service authentication

  • Generate service tokens
  • Set appropriate audiences
  • Configure token scopes
  • Implement token rotation
Pro Tip: Use short-lived tokens with refresh mechanisms for better security

Industry-Specific Applications

api providers:

API key management, rate limiting, usage tracking

mobile apps:

User authentication, offline access, session management

iot:

Device authentication, secure communication, firmware updates

cloud:

Service mesh auth, container security, API gateways

blockchain:

Wallet access, transaction signing, identity verification

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What signing algorithms are supported?
The generator typically supports common algorithms including HS256 (symmetric), RS256 (asymmetric), and other HMAC and RSA variants. Choose based on your security requirements and implementation constraints.
Can I add custom claims to my JWT tokens?
Yes, you can add custom payload claims beyond the standard ones (iss, exp, sub, etc.). Custom claims allow you to include application-specific data like user roles, permissions, or other relevant information.
How do I validate the generated JWT tokens?
The tool often includes validation functionality to verify token signatures and decode payloads. You can test tokens before implementation to ensure they work correctly with your authentication system.
Should I use JWT tokens for session management?
JWTs are excellent for stateless authentication and API authorization. However, consider the trade-offs: they can't be easily revoked and may become large with many claims. Evaluate based on your specific security and scalability needs.
Are the generated tokens secure for production use?
The tokens are cryptographically secure if you use strong secrets and appropriate algorithms. However, always protect your signing keys, use HTTPS, and follow JWT security best practices in production environments.

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