02 / Node.js

Price monitoring with Node.js

Schedule bounded fetches and reuse a sticky session when several steps belong together.

You will build

A measurable monitor job with one exit per run

E-commerceSticky

Node.js

import { ProxyAgent } from "undici";

const key = process.env.PROXYAPI_KEY;
if (!key) throw new Error("PROXYAPI_KEY is required");

const runId = Date.now().toString(36);
const dispatcher = new ProxyAgent(
  `https://${key}-country-se-type-isp-session-price${runId}:@proxy.proxyapi.se:443`,
);

const response = await fetch("https://example.com/product", {
  dispatcher,
  signal: AbortSignal.timeout(20_000),
  headers: { "user-agent": "YourCompanyPriceMonitor/1.0" },
});
if (!response.ok) throw new Error(`Target returned ${response.status}`);
const html = await response.text();
console.log({ bytes: html.length, status: response.status });

Before production

✓Identify your client where appropriate and keep frequency proportionate.
✓Start with datacenter exits; change type only when measurements show it is needed.

Open documentation → More examples