JWT Generator
Create secure, signed JSON Web Tokens for authentication testing and development
📈 Averaging 16 uses per day
Start Generating
Create custom JWT tokens with your own headers, payloads, and secrets
JWT Header
JWT Payload
Secret Key
🔐 Security Notes
- • All processing happens in your browser - secrets never leave your device
- • Use strong, unique secrets for production tokens
- • Always set expiration times (exp) for security
- • Consider using RS256 for production applications
How to Use JWT Generator
- 1
Configure JWT Header
Set the algorithm (HS256 recommended) and token type. The header defines how the token will be signed and processed by authentication systems.
Tip:Use HS256 for symmetric key signing or RS256 for asymmetric public/private key pairs in production. - 2
Create Token Payload
Add your claims including user information, permissions, and timestamps. Include 'sub' (subject), 'iat' (issued at), and 'exp' (expiration) for standard compliance.
Tip:Keep payloads minimal - avoid sensitive data as JWTs are easily decoded. Use short expiration times for security. - 3
Set Secret Key
Provide a strong secret key for token signing. This key will be used to verify token authenticity and should be kept secure on your server.
Tip:Use at least 256-bit secrets in production. Consider using environment variables to store keys securely. - 4
Generate and Test Token
Click generate to create your signed JWT token. Copy the token and test it in your application's authentication flow or debugging tools.
Tip:Test tokens immediately in your JWT debugger to verify structure and signature before deployment. - 5
Implement in Authentication Flow
Use the generated token in your API calls, store it securely in your application, and implement proper token validation on your backend.
Tip:Always validate tokens server-side and implement proper error handling for expired or invalid tokens.
Security & Privacy
- Signing happens 100% in your browser; nothing is uploaded.
- Keep secrets secure; they never leave your device.
- Use test tokens in shared devices; rotate keys regularly.
Features & Benefits
Secure Token Generation
Generate cryptographically signed JWT tokens with HMAC-SHA256 algorithm support, ensuring token authenticity and preventing tampering in authentication systems.
Custom Payload Builder
Create flexible JWT payloads with custom claims, user information, permissions, and timestamps for precise authentication and authorization control.
Real-time Token Preview
Instantly preview generated tokens with clear header-payload-signature structure visualization for immediate validation and debugging.
Client-side Processing
Generate tokens entirely in your browser with no server communication, ensuring complete privacy and security for sensitive authentication data.
Sample Token Templates
Quick-start with pre-configured authentication templates including common claims, expiration times, and standard JWT structure patterns.
One-click Token Export
Instantly copy generated tokens to clipboard for immediate testing in applications, APIs, or authentication debugging workflows.
Frequently Asked Questions
What's the difference between JWT Generator and JWT Debugger?
JWT Generator creates new signed tokens from custom headers, payloads, and secrets, while JWT Debugger decodes and validates existing tokens. Use the generator for creating test tokens and authentication development, and the debugger for analyzing and troubleshooting existing JWT tokens.
Is it safe to use this tool with production secrets?
All processing happens entirely in your browser with no data sent to servers, making it safe for development and testing. However, for production secrets, consider using server-side generation or dedicated development keys to maintain security best practices.
Which signing algorithm should I choose for my application?
HS256 (HMAC-SHA256) is suitable for most applications where the same system generates and validates tokens. For distributed systems or when you need public key verification, consider RS256. The tool currently supports HS256 and 'none' for testing purposes.
How do I set proper token expiration times?
Use short expiration times (15-60 minutes) for access tokens and longer times (days/weeks) for refresh tokens. The tool includes an 'Add Expiration' button that sets tokens to expire in 1 hour. Always include 'exp' claim for security.
Can I use these tokens directly in production applications?
Generated tokens are valid and properly signed, but ensure you're using production-grade secrets, appropriate expiration times, and proper claims for your use case. Test thoroughly and validate all security requirements before production deployment.
What claims should I include in my JWT payload?
Include standard claims like 'sub' (user ID), 'iat' (issued at), 'exp' (expiration), and custom claims for your application (roles, permissions, etc.). Avoid sensitive data as JWTs are easily decoded - they provide integrity, not confidentiality.
Technical Specifications
Use Cases & Applications
API Authentication Testing
Generate test tokens with specific user roles and permissions to validate API endpoints, test authorization logic, and debug authentication flows.
Microservices Communication
Create service-to-service authentication tokens for secure inter-service communication, ensuring proper authorization between distributed components.
Frontend Development Setup
Generate tokens for frontend testing without backend dependencies, enabling UI development and authentication flow testing in isolation.
OAuth Integration Testing
Create custom JWT tokens to simulate OAuth provider responses, test token handling, and validate third-party authentication integration.
Session Management Prototyping
Experiment with different token structures, expiration strategies, and claim combinations to design optimal session management systems.
Security Testing Scenarios
Generate tokens with various configurations to test security boundaries, token validation logic, and authentication error handling.