237 lines
8.5 KiB
Markdown
237 lines
8.5 KiB
Markdown
# Puppeteer
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[](https://github.com/puppeteer/puppeteer/actions?query=workflow%3ACI)
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[](https://npmjs.org/package/puppeteer)
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<img src="https://user-images.githubusercontent.com/10379601/29446482-04f7036a-841f-11e7-9872-91d1fc2ea683.png" height="200" align="right"/>
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#### [Guides](https://pptr.dev/category/guides) | [API](https://pptr.dev/api) | [FAQ](https://pptr.dev/faq) | [Contributing](https://pptr.dev/contributing) | [Troubleshooting](https://pptr.dev/troubleshooting)
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> Puppeteer is a Node.js library which provides a high-level API to control
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> Chrome/Chromium over the
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> [DevTools Protocol](https://chromedevtools.github.io/devtools-protocol/).
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> Puppeteer runs in
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> [headless](https://developers.google.com/web/updates/2017/04/headless-chrome)
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> mode by default, but can be configured to run in full (non-headless)
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> Chrome/Chromium.
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#### What can I do?
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Most things that you can do manually in the browser can be done using Puppeteer!
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Here are a few examples to get you started:
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- Generate screenshots and PDFs of pages.
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- Crawl a SPA (Single-Page Application) and generate pre-rendered content (i.e.
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"SSR" (Server-Side Rendering)).
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- Automate form submission, UI testing, keyboard input, etc.
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- Create an automated testing environment using the latest JavaScript and
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browser features.
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- Capture a
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[timeline trace](https://developers.google.com/web/tools/chrome-devtools/evaluate-performance/reference)
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of your site to help diagnose performance issues.
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- Test Chrome Extensions.
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## Getting Started
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### Installation
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To use Puppeteer in your project, run:
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```bash
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npm i puppeteer
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# or `yarn add puppeteer`
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# or `pnpm i puppeteer`
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```
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When you install Puppeteer, it automatically downloads a recent version of
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Chromium (~170MB macOS, ~282MB Linux, ~280MB Windows) that is [guaranteed to
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work](https://pptr.dev/faq#q-why-doesnt-puppeteer-vxxx-work-with-chromium-vyyy)
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with Puppeteer. The browser is downloaded to the `$HOME/.cache/puppeteer` folder
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by default (starting with Puppeteer v19.0.0).
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If you deploy a project using Puppeteer to a hosting provider, such as Render or
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Heroku, you might need to reconfigure the location of the cache to be within
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your project folder (see an example below) because not all hosting providers
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include `$HOME/.cache` into the project's deployment.
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For a version of Puppeteer without the browser installation, see
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[`puppeteer-core`](#puppeteer-core).
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#### Configuration
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Puppeteer uses several defaults that can be customized through configuration
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files.
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For example, to change the default cache directory Puppeteer uses to install
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browsers, you can add a `.puppeteerrc.cjs` (or `puppeteer.config.cjs`) at the
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root of your application with the contents
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```js
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const {join} = require('path');
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/**
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* @type {import("puppeteer").Configuration}
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*/
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module.exports = {
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// Changes the cache location for Puppeteer.
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cacheDirectory: join(__dirname, '.cache', 'puppeteer'),
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};
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```
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After adding the configuration file, you will need to remove and reinstall
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`puppeteer` for it to take effect.
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See the [configuration guide](https://pptr.dev/guides/configuration) for more
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information.
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#### `puppeteer-core`
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Every release since v1.7.0 we publish two packages:
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- [`puppeteer`](https://www.npmjs.com/package/puppeteer)
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- [`puppeteer-core`](https://www.npmjs.com/package/puppeteer-core)
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`puppeteer` is a _product_ for browser automation. When installed, it downloads
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a version of Chromium, which it then drives using `puppeteer-core`. Being an
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end-user product, `puppeteer` automates several workflows using reasonable
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defaults [that can be customized](https://pptr.dev/guides/configuration).
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`puppeteer-core` is a _library_ to help drive anything that supports DevTools
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protocol. Being a library, `puppeteer-core` is fully driven through its
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programmatic interface implying no defaults are assumed and `puppeteer-core`
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will not download Chromium when installed.
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You should use `puppeteer-core` if you are
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[connecting to a remote browser](https://pptr.dev/api/puppeteer.puppeteer.connect)
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or [managing browsers yourself](https://pptr.dev/api/puppeteer.browserfetcher).
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If you are managing browsers yourself, you will need to call
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[`puppeteer.launch`](https://pptr.dev/api/puppeteer.puppeteernode.launch) with
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an an explicit
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[`executablePath`](https://pptr.dev/api/puppeteer.launchoptions.executablepath)
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(or [`channel`](https://pptr.dev/api/puppeteer.launchoptions.channel) if it's
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installed in a standard location).
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When using `puppeteer-core`, remember to change the import:
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```ts
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import puppeteer from 'puppeteer-core';
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```
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### Usage
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Puppeteer follows the latest
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[maintenance LTS](https://github.com/nodejs/Release#release-schedule) version of
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Node.
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Puppeteer will be familiar to people using other browser testing frameworks. You
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[launch](https://pptr.dev/api/puppeteer.puppeteernode.launch)/[connect](https://pptr.dev/api/puppeteer.puppeteernode.connect)
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a [browser](https://pptr.dev/api/puppeteer.browser),
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[create](https://pptr.dev/api/puppeteer.browser.newpage) some
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[pages](https://pptr.dev/api/puppeteer.page), and then manipulate them with
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[Puppeteer's API](https://pptr.dev/api).
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For more in-depth usage, check our [guides](https://pptr.dev/category/guides)
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and [examples](https://github.com/puppeteer/puppeteer/tree/main/examples).
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#### Example
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The following example searches [developer.chrome.com](https://developer.chrome.com/) for blog posts with text "automate beyond recorder", click on the first result and print the full title of the blog post.
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```ts
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import puppeteer from 'puppeteer';
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(async () => {
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const browser = await puppeteer.launch();
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const page = await browser.newPage();
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await page.goto('https://developer.chrome.com/');
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// Set screen size
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await page.setViewport({width: 1080, height: 1024});
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// Type into search box
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await page.type('.search-box__input', 'automate beyond recorder');
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// Wait and click on first result
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const searchResultSelector = '.search-box__link';
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await page.waitForSelector(searchResultSelector);
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await page.click(searchResultSelector);
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// Locate the full title with a unique string
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const textSelector = await page.waitForSelector(
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'text/Customize and automate'
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);
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const fullTitle = await textSelector.evaluate(el => el.textContent);
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// Print the full title
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console.log('The title of this blog post is "%s".', fullTitle);
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await browser.close();
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})();
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```
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### Default runtime settings
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**1. Uses Headless mode**
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Puppeteer launches Chromium in
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[headless mode](https://developers.google.com/web/updates/2017/04/headless-chrome).
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To launch a full version of Chromium, set the
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[`headless`](https://pptr.dev/api/puppeteer.browserlaunchargumentoptions.headless)
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option when launching a browser:
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```ts
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const browser = await puppeteer.launch({headless: false}); // default is true
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```
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**2. Runs a bundled version of Chromium**
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By default, Puppeteer downloads and uses a specific version of Chromium so its
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API is guaranteed to work out of the box. To use Puppeteer with a different
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version of Chrome or Chromium, pass in the executable's path when creating a
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`Browser` instance:
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```ts
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const browser = await puppeteer.launch({executablePath: '/path/to/Chrome'});
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```
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You can also use Puppeteer with Firefox Nightly (experimental support). See
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[`Puppeteer.launch`](https://pptr.dev/api/puppeteer.puppeteernode.launch) for
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more information.
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See
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[`this article`](https://www.howtogeek.com/202825/what%E2%80%99s-the-difference-between-chromium-and-chrome/)
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for a description of the differences between Chromium and Chrome.
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[`This article`](https://chromium.googlesource.com/chromium/src/+/refs/heads/main/docs/chromium_browser_vs_google_chrome.md)
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describes some differences for Linux users.
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**3. Creates a fresh user profile**
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Puppeteer creates its own browser user profile which it **cleans up on every
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run**.
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#### Using Docker
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See our [Docker guide](https://pptr.dev/guides/docker).
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#### Using Chrome Extensions
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See our [Chrome extensions guide](https://pptr.dev/guides/chrome-extensions).
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## Resources
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- [API Documentation](https://pptr.dev/api)
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- [Guides](https://pptr.dev/category/guides)
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- [Examples](https://github.com/puppeteer/puppeteer/tree/main/examples)
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- [Community list of Puppeteer resources](https://github.com/transitive-bullshit/awesome-puppeteer)
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## Contributing
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Check out our [contributing guide](https://pptr.dev/contributing) to get an
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overview of Puppeteer development.
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## FAQ
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Our [FAQ](https://pptr.dev/faq) has migrated to
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[our site](https://pptr.dev/faq).
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