In this basic example, we create a visible browser instance, start a new tab, go to webpage and print its contents. This setting allows us to scrape non-https websites easier for development lets keep this to true so we can see what's going on but in Headless option allows us to disable visible GUI, so the browser runs in the 'background' First, we must launch a browser instance We'll start a headless Chrome web browser (headless mode meaning a special version of the browser that has no GUI elements), tell it to go to some websites, wait for it to load and retrieve the HTML page source: // import puppeteer library Now with our package ready let's start with the most basic example. If you're unfamiliar with async await syntax in Javascript, we recommend this quick introduction article by MDN. This means we'll be working in the context of Promises and async/await programming. The first thing we should note is that Puppeteer is an asynchronous node library. Puppeteer node js library can be installed through NodeJS package manager npm with these terminal commands: $ mkdir myproject & cd myproject Now, let's take a look at this in greater detail. The easiest way to experiment and get the hang of Puppeteer is to use nodejs REPL and try Puppeteer out real-time. In turn, more complexity also requires more developer diligence and maintenance. That being said, there are some negatives.īrowsers are complex software projects and are very resource intensive. Since we look like normal website users, we are much harder to identify as robots. Web Browser based scrapers are harder to detect and block.making web scraper development much easier. In other words, the browser renders all scripts, images, etc. Web Browser based scrapers see what users see.CDP translates program commands to web browser commandsĪs you can imagine, Puppeteer is a brilliant tool for web scraping! Automating a web browser gives our web scraper several advantages: In other words, Puppeteer allows us to create web scrapers in Chrome or Firefox browsers. In particular, Chrome Devtools Protocol (aka CDP) - is a high-level API protocol that allows programs to control Chrome or Firefox web browser instances through socket connections. Modern web browsers now contain special access tools for automation and cross-program communication.

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