![]() log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer. ![]() The code snippet below is a simple example of running parallel downloads with Puppeteer.Ĭonst downloadPath = path. □ If you are not familiar with how child process work in Node I highly encourage you to give this article a read. We can combine the child process module with our Puppeteer script and download files in parallel. Child process is how Node.js handles parallel programming. Puppeteer contains APIs to interact and manage Chrome browser in headless mode or Chromium (following the protocols in DevTools). ![]() We can fork multiple child_proces in Node. Puppeteer is based on the Node.js library and is open-source. Our CPU cores can run multiple processes at the same time. In my case, I’ll name it Puppeteer -Tutorial. ![]() To that end, create a new folder and name it whatever you like. To skip the download, see Environment variables. The next thing to do is to initialize a new node.js project. To use Puppeteer in your project, run: bashnpm i puppeteer or 'yarn add puppeteer' Note: When you install Puppeteer, it downloads a recent version of Chromium (170MB Mac, 282MB Linux, 280MB Win) that is guaranteed to work with the API. Learn how to download Node.js installer and NPM here. □ Learn more about the single threaded architecture of node here Alright, first thing, make sure you have Node and NPM installed Puppeteer relies heavily on those. basics/alerts.js Download file / upload file Find an image by class selector, downloads the image, saves it to disk and read it again. alerts Create an alert dialog and close it again. Therefore if we have to download 10 files each 1 gigabyte in size and each requiring about 3 mins to download then with a single process we will have to wait for 10 x 3 = 30 minutes for the task to finish. Puppeteer is a Node library which provides a high-level API to control headless Chrome or Chromium over the DevTools Protocol. Highlights the basic Puppeteer functions. It can only execute one process at a time. You see Node.js in its core is a single-threaded system. However, if you have to download multiple large files things start to get complicated. In this next part, we will dive deep into some of the advanced concepts. ![]()
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