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HS256 (HMAC-SHA256)
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All ToolsGenerate JWT Token
Generate JWT Token
Generate HS256-signed JWT tokens from a JSON payload and secret key using the Web Crypto API.
What is Generate JWT Token?
Generate JWT Token is a free online tool that creates valid HS256-signed JSON Web Tokens. Enter your JSON payload and a secret key, and get a signed JWT token ready to use in your API.
How It Works
The tool constructs the standard JWT header {"alg":"HS256","typ":"JWT"}, Base64URL-encodes both header and payload, then signs the result using the HMAC-SHA256 algorithm via the Web Crypto API (SubtleCrypto). The three parts are joined with dots.
How to Use
- 1
Enter payload
Type or paste the JSON payload (claims) you want to encode into the JWT.
- 2
Set secret key
Enter an HMAC secret key for HS256/HS384/HS512, or provide RSA/EC keys for asymmetric algorithms.
- 3
Choose algorithm
Select the signing algorithm: HS256 is standard for most APIs; RS256 is used for public-key scenarios.
- 4
Generate token
Click "Generate JWT". The signed token is produced instantly in the browser.
- 5
Copy and use
Copy the JWT to use in API Authorization headers, OAuth flows, or testing environments.
Who Uses This Tool
🔐
API Authentication Testing
Generate test JWT tokens for local development and staging environments without needing a running auth server.
🧪
Unit Test Fixtures
Create signed tokens with custom claims to use as fixtures in automated tests for your middleware.
📚
JWT Learning
Experiment with different payload claims and secrets to understand how JWT structure and signing works.
🛠️
Postman / Insomnia Setup
Quickly generate a token with the correct claims to paste into API client Authorization headers.
⚙️
Microservice Simulation
Simulate tokens from different services by changing the iss, sub, and aud claims to test authorization logic.
⏰
Expiry Testing
Create tokens with specific exp timestamps to test token refresh flows and expiry-handling code paths.
Why Choose This Tool
Web Crypto API Signing
Uses SubtleCrypto HMAC-SHA256 for signing, the same standard used by production JWT libraries.
Color-Coded Token Parts
Header, payload, and signature are displayed in distinct colors so you can visually identify each section.
Pre-Filled Payload
A sensible default payload with sub, name, iat, and exp claims is provided so you can generate a token in one click.
Standards Compliant
Output follows RFC 7519 exactly — Base64URL encoding, dot-separated parts, and correct HS256 algorithm header.
No Server Required
Token generation is 100% client-side so your secret key is never exposed to any external server.
Instant Copy
Copy the complete JWT token to your clipboard with a single click for immediate use in requests.
Key Benefits
- Generates standards-compliant HS256 JWT tokens
- Uses the browser's Web Crypto API for signing
- Color-coded token parts: header, payload, signature
- Pre-filled payload with common claims
- No data sent to any server
Frequently Asked Questions
Also Known As
jwt generator online freegenerate jwt token onlinehs256 jwt generator browsercreate json web token onlinejwt token builder toolonline jwt creator with secretgenerate jwt for api testingfree jwt token generator no login
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