JWT Generator helps you handle security and cryptography tasks quickly and accurately, right in your browser. Whether you need to generate signed jwt tokens for testing with custom headers and payloads, this tool eliminatesexposure of sensitive data and security misconfigurations by giving you instant, reliable results. Every operation runs locally on your device — nothing is uploaded to any server, so your data stays completely private.
Key Features
Custom Payload
Build JWT payloads with standard claims (sub, exp, iat, iss) and custom fields.
Algorithm Selection
HS256, HS384, HS512 signing algorithms with custom secret keys.
Header Customization
Customize header parameters like kid, typ, and cty.
Local Signing
All signing happens in your browser using the Web Crypto API.
Common Use Cases
- Generating JWT tokens for API authentication testing and development
- Creating signed JWTs with custom claims for single sign-on (SSO) systems
- Testing JWT token expiration and claim validation in security testing workflows
JWT Generator
Generate signed JWT tokens for testing with custom headers and payloads.
Frequently Asked Questions
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What is JWT Generator?
JWT Generator is a browser-based security tool that generate signed jwt tokens for testing with custom headers and payloads. It offers Custom Payload, Algorithm Selection, Header Customization — all processed locally on your device. Because no data is ever uploaded, you can handle sensitive information like passwords, tokens, and encryption keys with complete confidence.
Security tools that send data to remote servers introduce unnecessary risk. JWT Generator takes a different approach: every cryptographic operation, token inspection, and password generation happens right in your browser using JavaScript. This means your secrets never leave your computer, making the tool suitable for handling production credentials, personal encryption keys, and sensitive authentication tokens.
Frequently Asked Questions
What algorithms are supported for JWT signing?
HS256, HS384, and HS512 are supported. These are HMAC-based symmetric signing algorithms using SHA-256, SHA-384, and SHA-512 respectively.
Is my secret key sent to a server?
No. All signing is done locally using the Web Crypto API. Your secret key and JWT payload never leave your browser.
What standard claims can I include?
Standard claims include sub (subject), exp (expiration), iat (issued at), iss (issuer), aud (audience), and custom claims can be added to the payload.
Can I customize the JWT header?
Yes. You can customize header parameters like kid (key ID), typ (type), and cty (content type) in the advanced options.
How does the Custom Payload feature work?
The Custom Payload feature build jwt payloads with standard claims (sub, exp, iat, iss) and custom fields. It is designed to be intuitive and responsive, giving you immediate feedback as you interact with the tool. All processing happens locally in your browser.
What is the benefit of algorithm selection?
Algorithm Selection hs256, hs384, hs512 signing algorithms with custom secret keys. This capability sets JWT Generator apart from basic alternatives by providing more comprehensive functionality while maintaining the privacy and speed of local processing.
Is JWT Generator really free to use?
Yes, JWT Generator is completely free with no hidden charges, no sign-up requirements, and no usage limits. You can use it as often as you need, for any purpose — personal projects, commercial work, or educational use. There are no premium tiers or paid features.
Does JWT Generator work on mobile devices?
Yes, it works on any device with a modern web browser — desktop, tablet, or phone. The interface is responsive and adapts to your screen size. Since all processing is done locally, you get the same performance regardless of your device.
What happens to my data when I use JWT Generator?
Your data never leaves your device. Every operation is performed locally in your browser using JavaScript. No information is uploaded, stored, logged, or shared with any server. This privacy-first approach means you can work with sensitive data — passwords, API keys, personal information — without any risk of exposure.
Key Features
Custom Payload
Build JWT payloads with standard claims (sub, exp, iat, iss) and custom fields.
Algorithm Selection
HS256, HS384, HS512 signing algorithms with custom secret keys.
Header Customization
Customize header parameters like kid, typ, and cty.
Local Signing
All signing happens in your browser using the Web Crypto API.
Common Use Cases
JWT Generator is useful in a variety of scenarios across different workflows:
Generating JWT tokens for API authentication testing and development
Creating signed JWTs with custom claims for single sign-on (SSO) systems
Testing JWT token expiration and claim validation in security testing workflows
Tips & Best Practices
Use strong secret keys
Use at least 256-bit (32-byte) secrets for HS256. Weak secrets can be brute-forced to forge tokens.
Set reasonable expiration
Always include an exp (expiration) claim. Short-lived tokens (15-60 minutes) reduce the risk of token theft.
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AES Encrypt
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Password Generator
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UUID Generator
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Related Guides & Articles
Deepen your knowledge with these security guides and tutorials:
Common Errors & Fixes
Learn how to fix common errors related to JWT Generator:
JWT Malformed Error
Fix 'jwt malformed' errors when decoding or verifying JWT tokens. Learn the correct JWT format and how to debug invalid tokens.
JWT Token Expired Error
Fix 'jwt expired' errors. Learn how JWT expiration works, how to check the exp claim, and implement token refresh flows.
JWT Invalid Signature Error
Fix 'invalid signature' JWT errors. Learn how JWT signatures work, why they fail, and how to use the correct secret key.