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
- 1Edit the Header JSON and Payload Claims JSON.
- 2Use the quick expiration buttons (+1h, +24h, +7d) to set valid exp timestamps.
- 3Enter your HMAC secret key.
- 4Click 'Sign & Generate JWT Token' to copy the signed token string.
Why Use ToolSnippet JWT Token Generator & Signer?
Ideal for mocking authentication tokens, testing API endpoints, and debugging microservices.
Provides color-coded visual breakdowns of the header, payload, and signature.
Tips for Best Results
- 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.
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