JWT Builder
// Encode and build JSON Web Tokens
Header
Algorithm:
{
"alg": "HS256",
"typ": "JWT"
}Payload
Add claim:
Secret
#About JWT Builder
Free online JWT encoder and builder. Create JSON Web Tokens by specifying header, payload, and secret with HMAC-SHA signing using the Web Crypto API. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
#FAQ
What signing algorithms are supported? ▾
The builder supports HMAC-based algorithms: HS256 (HMAC-SHA256), HS384 (HMAC-SHA384), and HS512 (HMAC-SHA512). Signing is done entirely in your browser using the Web Crypto API.
Is this safe for production tokens? ▾
This tool is designed for development and testing. For production JWTs, use your server-side signing infrastructure. Never share your production signing secrets.
</> Embed this tool ▾
Copy this code to embed the tool on your website. Adjust the height to fit your layout.
<iframe src="https://www.browserutils.dev/embed/jwt-builder" width="100%" height="500" frameborder="0" title="JWT Builder"></iframe>