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. Learn how to set up and run automated tests with code. We can combine the child process module with our Puppeteer script and download files in parallel. Use the download method in your next Puppeteer project with LambdaTest Automation Testing Advisor. Child process is how Node.js handles parallel programming. Now, let’s check out these examples : Puppeteer examples : 1.Visit a website : The first basic thing is to visit a website with Puppeteer. We can fork multiple child_proces in Node. You want to learn what is Puppeteer and how to install it Check the end of this post. ![]() Here are the steps to do it: Next, set the download behavior to enable automatic downloads: In the above code, the behavior option is set to 'allow' to enable automatic downloads. Our CPU cores can run multiple processes at the same time. To download a file with Puppeteer using headless mode, you can set the download behavior using the () method. □ Learn more about the single threaded architecture of node here 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. Output from some of the examples: codecoverage. You see Node.js in its core is a single-threaded system. Examples for using Puppeteer to do big, bold things. ![]() 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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