Siren SDK for Node.js

Record affiliate and incentive events, and verify signed webhooks, in a few lines of TypeScript.

What is Siren?

Siren is headless affiliate and incentive tracking for any commerce stack. It tracks the full lifecycle from customer interaction to payout — clicks, sales, signups, course completions — and computes rewards from flexible rules you define. Affiliate programs, referral programs, partner and reseller commissions, creator royalties, sales commissions, and loyalty rewards all run on the same engine.

What this SDK does

This SDK is the Node.js and TypeScript integration point for Siren. In a few lines you can:

• Record events (events.sale, events.refund, events.siteVisited) so conversions and payouts compute.
• Verify signed webhooks (webhooks.constructEvent) so you can trust inbound deliveries.

It runs on Node 18+ with zero runtime dependencies (it uses the global fetch), and ships ESM, CJS, and full type declarations.

Install

npm install @novatorius/siren

Quickstart: record a sale

Mint an API key in the Siren dashboard (Settings → API Keys), then:

import { Siren } from '@novatorius/siren';

const siren = new Siren({ apiKey: process.env.SIREN_API_KEY! });

// Record a completed sale so conversions and payouts compute.
// `total` is in MAJOR currency units: 49.99 means $49.99.
const { opportunityId } = await siren.events.sale({
  source: 'stripe',                 // your commerce source
  externalId: 'cs_test_a1b2c3',     // your order id — used to match refunds later
  total: 49.99,
  trackingId: 4021,                 // opportunity id from the Siren tracking cookie
});

console.log(`Recorded against opportunity ${opportunityId}`);

With line items (per-unit amount; a missing quantity defaults to 1):

await siren.events.sale({
  source: 'woocommerce',
  externalId: 'order-88',
  total: 159.97,
  trackingId: 4021,
  items: [
    { name: 'Pro Plan (annual)', amount: 49.99 },                 // quantity defaults to 1
    { externalId: 'sku-2', name: 'Add-on seat', quantity: 3, amount: 36.66 },
  ],
});

Refunds and referred visits work the same way:

await siren.events.refund({ source: 'stripe', externalId: 'cs_test_a1b2c3' });
await siren.events.siteVisited({ collaboratorId: 88, userId: 12345 });
await siren.events.ingest('loyalty-points-earned', { userId: 42, points: 100 });

Quickstart: verify a webhook

Siren signs every delivery with X-Siren-Signature: sha256=<hmac> — an HMAC-SHA256 of the raw request body keyed by your subscription's signing secret. constructEvent verifies the signature (constant-time) and parses the event in one call.

⚠️ You MUST pass the RAW request body bytes to constructEvent. Body parsers like express.json() re-serialize the payload, and the HMAC will never match a re-serialized body. Use express.raw() (or your framework's raw-body equivalent) on the webhook route so you hand constructEvent the exact bytes Siren sent.

import express from 'express';
import { Siren, SignatureVerificationError } from '@novatorius/siren';

const siren = new Siren({ apiKey: process.env.SIREN_API_KEY! });
const app = express();

app.post('/webhooks/siren', express.raw({ type: 'application/json' }), (req, res) => {
  let event;
  try {
    event = siren.webhooks.constructEvent(
      req.body,                              // raw Buffer — exact bytes received
      req.header('X-Siren-Signature'),
      process.env.SIREN_WEBHOOK_SECRET!,
    );
  } catch (err) {
    if (err instanceof SignatureVerificationError) {
      return res.status(400).send('invalid signature');
    }
    throw err;
  }

  switch (event.type) {
    case 'conversion.approved':
      // ...
      break;
    case 'payout.paid':
      // ...
      break;
  }

  res.sendStatus(200);
});

Create the subscription (the signingSecret is returned once — store it):

import { WebhookEventType } from '@novatorius/siren';

const sub = await siren.webhooks.subscriptions.create({
  targetUrl: 'https://example.com/webhooks/siren',
  events: [WebhookEventType.ConversionApproved, WebhookEventType.PayoutPaid],
  // or: events: [WebhookEventType.All]
});
await saveSecretSomewhereSafe(sub.signingSecret);

Features

• Event ingestion — record sales, refunds, referred visits, and custom event types (events.sale, events.refund, events.siteVisited, events.ingest). Ingestion is auto-retried on network errors and 429/5xx.
• Signed-webhook verification and subscriptions — constant-time signature checks (webhooks.constructEvent, webhooks.verifySignature) plus subscription management (webhooks.subscriptions.create / list / delete).
• API keys — mint, list, and revoke keys (apiKeys.create / list / revoke). The raw key is returned once and cannot be retrieved later.
• Reconciliation reads — thin paginated readers over Siren's ledger for conversions, transactions, obligations, and payouts.
• Typed errors — every failure throws a typed subclass of SirenError carrying message, code, and statusCode (NotFoundError, RateLimitError, ValidationError, and more).

const conversions = await siren.conversions.list({ page: 1, perPage: 50 });
console.log(conversions.estimatedCount); // total across all pages, if known

const key = await siren.apiKeys.create({ label: 'Production server' });
// key.rawKey (sk_live_...) is returned ONCE and cannot be retrieved later.

Configuration

const siren = new Siren({
  apiKey: 'sk_live_...',                                 // required
  baseUrl: 'https://api.sirenaffiliates.com/siren/v1',   // default; point at staging/local as needed
  timeout: 30_000,                                       // ms, default 30s
  maxRetries: 2,                                         // default 2
});

Idempotent reads and event ingestion automatically retry network errors and 429/5xx responses with exponential backoff (honoring Retry-After). Management writes — apiKeys.create and webhooks.subscriptions.create — are never auto-retried, so a flaky connection can't mint duplicate credentials.

Other SDKs

Siren ships official SDKs in three languages, all built against the same API:

• Node.js / TypeScript — this repository
• Python — https://github.com/Novatorius/siren-python
• PHP — https://github.com/Novatorius/siren-php

Links

• Siren — https://sirenaffiliates.com
• OpenAPI specification — ./openapi.yaml
• Issues — https://github.com/Novatorius/siren-node/issues

Contributing

Contributions are welcome. See CONTRIBUTING.md for how to clone, build, test, and open a pull request. Please also review our Code of Conduct.

Error handling

API and network failures throw a typed subclass of SirenError. Catch the base class to handle any SDK error, or branch on a specific subclass. Every error has a message; code (the API's machine-readable error code) and statusCode (the HTTP status) are set when the failing response provides them — ConnectionError and SignatureVerificationError, for example, carry no statusCode:

Error	When it's thrown
AuthenticationError	Missing or invalid API key (401)
PermissionError	Key lacks permission for the operation (403)
NotFoundError	The requested resource does not exist (404)
ValidationError	Request payload failed validation (422)
BadRequestError	Malformed request (400)
ConflictError	Conflicting state, e.g. a duplicate (409)
RateLimitError	Rate limit exceeded (429); honors Retry-After
ApiError	Unexpected server error (5xx)
ConnectionError	Network failure reaching Siren
SignatureVerificationError	A webhook signature did not verify

Two exceptions to the subclass rule: constructing a client without an apiKey throws the base SirenError itself, and webhooks.constructEvent throws a native SyntaxError — not a SirenError — when a correctly signed body is not valid JSON.

import {
  Siren,
  SirenError,
  RateLimitError,
  ValidationError,
  NotFoundError,
} from '@novatorius/siren';

const siren = new Siren({ apiKey: process.env.SIREN_API_KEY! });

try {
  await siren.events.sale({
    source: 'stripe',
    externalId: 'cs_test_a1b2c3',
    total: 49.99,
    trackingId: 4021,
  });
} catch (err) {
  if (err instanceof RateLimitError) {
    // already retried with backoff; back off further or queue for later
  } else if (err instanceof ValidationError) {
    console.error('Invalid payload:', err.message, err.code);
  } else if (err instanceof NotFoundError) {
    // nothing matched — e.g. a refund for a sale Siren never recorded
  } else if (err instanceof SirenError) {
    // statusCode/code are set when the API produced the failure
    console.error(`Siren error ${err.statusCode ?? 'n/a'} (${err.name}):`, err.message);
  } else {
    throw err; // not a Siren error
  }
}

Resources

• Siren homepage
• npm package
• GitHub repository

License

MIT © 2026 Novatorius LLC