Create & Sign JSON Web Tokens (JWT)
Build custom JWT headers and payload claims, set expiration timestamps, and sign tokens with secret keys.
About This Tool
JWT Token Generator & Signer allows developers to create standard RFC 7519 JSON Web Tokens (header.payload.signature) with custom claims (sub, name, admin, iat, exp) and HMAC-SHA256 signatures.
Key Features
Customizable JSON header and payload claims
Quick expiration presets (+1h, +24h, +7d)
HMAC-SHA256 cryptographic signing
Color-coded 3-part token breakdown
How to Use This Tool
- Edit the Header JSON and Payload Claims JSON.
- Use the quick expiration buttons (+1h, +24h, +7d) to set valid exp timestamps.
- Enter your HMAC secret key.
- Click 'Sign & Generate JWT Token' to copy the signed token string.
Why Use This Tool
- Ideal for mocking authentication tokens, testing API endpoints, and debugging microservices.
- Provides color-coded visual breakdowns of the header, payload, and signature.
Pro Tips
- Standard JWT tokens consist of three Base64URL parts separated by dots: header.payload.signature
Frequently Asked Questions
What algorithm is used to sign the token?
This tool uses HMAC-SHA256 (HS256) running via the browser's native Web Crypto API.