@arltech/api-sign

Deterministic API request signing utility using HMAC-SHA256.

Features

• Canonical payload sorting
• Stable signature generation
• HMAC-SHA256 signing
• Base64 output
• Fintech / API integration friendly

Installation

npm install @arltech/api-sign

Usage

const { generateSignature } = require("@arltech/api-sign");

const payload = { amount: 100, currency: "USD", reference: "TX123" };

const signature = generateSignature(payload, "secret123");

console.log(signature);

Signature Process

1. Sort payload keys alphabetically
2. Build canonical string: key=value&key2=value2
3. HMAC-SHA256 sign
4. Hex → uppercase → Base64

License

MIT