log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer. The browser is downloaded to the HOME/.cache/puppeteer folder by default (starting with Puppeteer v19.0.0). The code snippet below is a simple example of running parallel downloads with Puppeteer.Ĭonst downloadPath = path. When you install Puppeteer, it automatically downloads a recent version of Chrome for Testing (170MB macOS, 282MB Linux, 280MB Windows) that is guaranteed to work with Puppeteer. 💡 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. We can fork multiple child_proces in Node.
Our CPU cores can run multiple processes at the same time. To skip the download, see Environment variables. 💡 Learn more about the single threaded architecture of node here To use Puppeteer in your project, run: npm 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. 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. 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. Once you have a solid understanding of Puppeteer’s API and how it fits together in the Node. In this next part, we will dive deep into some of the advanced concepts. There are many ways you can download files with Puppeteer.
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