Browser scripting has never been that easy, up to date and closer to a modern development stack.&10 One thing has been harder to coin though: handling the download of a file and hand it over to Node.js.&10 This blog post documents how to achieve it. log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer. I recently had a go with Headless Chrome and Puppeteer to download bank account statements. 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. □ If you are not familiar with how child process work in Node I highly encourage you to give this article a read. At any rate, I hope someone has made a third-party extension in that case. that is surprising to me, as I can't think of a good reason why they wouldn't implement that. We can combine the child process module with our Puppeteer script and download files in parallel. Puppeteer won't implement this /GoogleChrome/puppeteer/issues/2433 hardkoded at 19:38 Well. Child process is how Node.js handles parallel programming. We can fork multiple child_proces in Node. In my case, I’ll name it Puppeteer -Tutorial. To that end, create a new folder and name it whatever you like. The next thing to do is to initialize a new node.js project. Learn how to download Node.js installer and NPM here. Our CPU cores can run multiple processes at the same time. Alright, first thing, make sure you have Node and NPM installed Puppeteer relies heavily on those. □ 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. 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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