![]() ![]() Close the Browser Method 2: Making a PDF from an HTML File Step 1. Create a Browser Instance and a New Page Step 2. Here we generate a CSV file and have the browser download it await page. Import Puppeteer Method 1: Making a PDF from a Web Page Using URL Step 1. log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer.Const puppeteer = require ( 'puppeteer' ) Ĭonst browser = await puppeteer.launch() The code snippet below is a simple example of running parallel downloads with Puppeteer.Ĭonst downloadPath = path. Chrome defaults to downloading files in various places, depending on the operating system. Once you have a solid understanding of Puppeteer’s API and how it fits together in the Node. □ If you are not familiar with how child process work in Node I highly encourage you to give this article a read. There are many ways you can download files with Puppeteer. 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. □ Learn more about the single threaded architecture of node here npm ERR Tell the author that this fails on your system: npm ERR node install. ![]() npm ERR This is most likely a problem with the puppeteer package, npm ERR not with npm itself. 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. Exit status 127 npm ERR npm ERR Failed at the puppeteer1.12.2 install script. 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. This API takes remote control of the headless Chromium instances and uses them as a portal for accessing a browser's (chrome) ability to render a webpage and its JavaScript elements. In this next part, we will dive deep into some of the advanced concepts. Puppeteer is a Node.js library that provides a high-level API to control headless Chrome or Chromium over the DevTools Protocol. ![]()
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