Categories > Web Browsers > Puppeteer Suggest Alternative Stars 2,377 License apache-2. log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer. Puppeteer Examples Puppeteer example scripts for running Headless Chrome from Node. 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. as Puppeteer will need to download and install Chromium in the background. We can combine the child process module with our Puppeteer script and download files in parallel. Specifically, well see a Puppeteer tutorial that goes through a few examples. Child process is how Node.js handles parallel programming. We can fork multiple child_proces in Node. let uri 'data:text/csv charsetutf-8,' + encodeURIComponent(content) window. Our CPU cores can run multiple processes at the same time. This page downloads a csv by creating a comma delimited string and forcing the browser to download it by setting the data type like so. We then queue two jobs and wait for the cluster to finish. Much like the /function API, the /download API allows you to POST a module to run that will return the file the browser downloads. In our prior example, we didn't care about the file-system in any capacity, however that changes if you wish to continue to use puppeteer in your code-base and call it programatically. Then a task is defined which includes going to the URL and taking a screenshot. The /workspace API allows for users to manually upload and download files that browserless (and thus Chrome) can access. ![]() A cluster is created with 2 concurrent workers. □ Learn more about the single threaded architecture of node here yarn add puppeteer puppeteer-cluster Usage The following is a typical example of using puppeteer-cluster. ![]() 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. In this next part, we will dive deep into some of the advanced concepts.
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