JSON → `JSON.stringify` → HMAC-SHA256 (hex)

Matches Node: createHmac('sha256', SECRET).update(JSON.stringify(body)).digest('hex')

UUID generator

Use default secret key (server)

When enabled, the HMAC is computed on the server with your Cloudflare env var SECRET.

Secret key

JSON object

1) Native JSON.stringify(obj)

2) HMAC-SHA256 (hex)