What is a JWT Generator?
A JWT (JSON Web Token) Generator is a tool that creates digitally signed tokens for secure information exchange between parties. JWTs are widely used for authentication, authorization, and information exchange in web applications. Our generator allows you to create tokens with custom claims, headers, and multiple HMAC algorithms (HS256, HS384, HS512) entirely in your browser.
How to Generate JWT Tokens Online
Generating JWT tokens with our tool is simple: 1) Choose your algorithm (HS256 recommended for most cases), 2) Configure standard claims like issuer (iss), subject (sub), and audience (aud), 3) Add custom claims for your application needs, 4) Set expiration time and other options, 5) Enter or generate a secure secret key, 6) Click Generate to create your token. All processing happens in your browser for maximum security.
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.
Free JWT Generator Without Registration
Our JWT Generator is completely free to use with no registration required. All token generation happens entirely in your browser using Web Crypto APIs, meaning your secret keys never leave your device. This ensures maximum privacy and security for your authentication workflows. Perfect for developers testing authentication systems, learning about JWT structure, or generating tokens for development environments.
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 settings.
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.