> For the complete documentation index, see [llms.txt](https://docs.helodata.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.helodata.com/integrations/scraping-tools/puppeteer.md).

# Puppeteer

Puppeteer needs two pieces: `--proxy-server` at launch, plus `page.authenticate()` for credentials.

## Basic setup

```js
import puppeteer from "puppeteer";

const browser = await puppeteer.launch({
  args: ["--proxy-server=http://gate.helodata.io:7777"],
});
const page = await browser.newPage();

await page.authenticate({
  username: "helo_s1a2b3c4d5e-type-res-region-us",
  password: "PASSWORD",
});

await page.goto("https://ipv4.icanhazip.com");
console.log(await page.content());
await browser.close();
```

`page.authenticate()` handles the proxy-auth dialog transparently.

## ISP

```js
const browser = await puppeteer.launch({
  args: ["--proxy-server=http://198.51.100.42:8000"],
});
await page.authenticate({ username: "helo_s1a2b3c4d5e", password: "PASSWORD" });
```

## Per-page proxy via `puppeteer-extra-plugin-proxy`

The official Puppeteer can't change proxy mid-session — once Chromium launches with `--proxy-server`, that's it. To rotate per-page, use the `puppeteer-page-proxy` plugin:

```bash
npm i puppeteer-extra puppeteer-extra-plugin-stealth puppeteer-page-proxy
```

```js
import puppeteer from "puppeteer-extra";
import StealthPlugin from "puppeteer-extra-plugin-stealth";
import useProxy from "puppeteer-page-proxy";

puppeteer.use(StealthPlugin());
const browser = await puppeteer.launch();
const page = await browser.newPage();

await useProxy(page, "http://helo_s1a2b3c4d5e-type-res-region-us:PASSWORD@gate.helodata.io:7777");
await page.goto("https://ipv4.icanhazip.com");
```

`useProxy()` can be called repeatedly to switch the page's proxy between requests.

## ISP rotation example

```js
import fs from "node:fs";
const list = fs.readFileSync("isp.txt", "utf8").trim().split("\n");
let i = 0;

async function fetchOne(url) {
  const line = list[i++ % list.length];
  const [ip, port, user, pass] = line.split(":");
  const p = `http://${user}:${pass}@${ip}:${port}`;
  await useProxy(page, p);
  await page.goto(url);
}
```

## Verify

```js
const ip = await page.evaluate(() =>
  fetch("https://ipv4.icanhazip.com").then(r => r.text())
);
console.log(ip.trim());
```

## Common pitfalls

* **`page.authenticate()` not set** before `page.goto()` — the first request will block on the auth dialog. Always call `authenticate()` immediately after `newPage()`.
* **`puppeteer-extra-plugin-stealth` masks the browser fingerprint** but does NOT change IP — combine with helodata for full coverage.
* **Same proxy across all pages** when using `--proxy-server` alone — for per-page proxies use the plugin above.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.helodata.com/integrations/scraping-tools/puppeteer.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.