How to Generate JWT Tokens Online Free
Our JWT Generator allows you to create JSON Web Tokens with custom claims, headers, and signatures. Perfect for developers working on authentication systems, API security, and token-based authorization. Generate tokens with various HMAC algorithms and customize every aspect of your JWT structure.
Advanced JWT Generation Features
Multiple HMAC Algorithms
Support for HS256, HS384, and HS512 algorithms using secure Web Crypto APIs. Choose the right algorithm based on your security requirements and compatibility needs.
Custom Claims & Headers
Add standard JWT claims (iss, sub, aud, exp) and custom claims with any data type. Customize headers with additional properties for enhanced token metadata.
Template System
Pre-built templates for common use cases: authentication tokens, API access tokens, refresh tokens, and email verification tokens. Quick start with best practices.
Secure Key Generation
Built-in secure random key generator using crypto.getRandomValues(). Generate strong secret keys with proper entropy for production use.
JWT Token Management
Control token expiration with flexible time formats, automatic timestamp generation, and validity checking. View detailed token information including size, algorithm, and expiration status. Export tokens in multiple formats and manage generation history for efficient development workflow.
Why Choose Our JWT Generator?
- 100% Client-Side Generation: All token creation happens in your browser using Web Crypto APIs
- Industry Standard Algorithms: Support for HMAC SHA-256, SHA-384, and SHA-512 algorithms
- Flexible Expiration: Set custom expiration times from minutes to years, or create non-expiring tokens
- Template Library: Quick setup with authentication, API access, refresh, and verification token templates
- Real-time Validation: Instant token validation with expiration checking and metadata display
- Development History: Track recent generations and reuse successful configurations
Frequently Asked Questions
What JWT algorithms are supported?
We support HMAC-based algorithms: HS256 (SHA-256), HS384 (SHA-384), and HS512 (SHA-512). These provide symmetric key signing suitable for most authentication scenarios.
Is my secret key secure during generation?
Yes! All JWT generation happens entirely in your browser using Web Crypto APIs. Your secret keys never leave your device and are not transmitted to any server.
Can I create tokens without expiration?
Yes, you can generate tokens without expiration dates. However, for security best practices, we recommend setting appropriate expiration times based on your use case.
What's the difference between the JWT templates?
Templates provide pre-configured JWT structures: Authentication (user login), API Access (service auth), Refresh (long-lived), and Email Verification (action-based). Each has appropriate claims and expiration.
How do I validate the generated tokens?
Use our JWT Decoder tool to parse and validate your generated tokens. You can also verify the signature using the same secret key in your application's JWT validation logic.
Can I add custom claims to my JWT?
Absolutely! Add any custom claims with string, number, boolean, or JSON object values. Standard claims (iss, sub, aud, exp, iat, nbf, jti) are also fully supported.