7/13/2023 0 Comments Web scraping using javascript![]() ![]() In this section, you will learn how to scrape a web page using cheerio. How to Scrape a Web Page in Node Using Cheerio ![]() If you want to use cheerio for scraping a web page, you need to first fetch the markup using packages like axios or node-fetch among others. That explains why it is also very fast - cheerio documentation. It simply parses markup and provides an API for manipulating the resulting data structure. The major difference between cheerio and a web browser is that cheerio does not produce visual rendering, load CSS, load external resources or execute JavaScript. Since it implements a subset of JQuery, it's easy to start using Cheerio if you're already familiar with JQuery.Īccording to the documentation, Cheerio parses markup and provides an API for manipulating the resulting data structure but does not interpret the result like a web browser. What is Cheerio?Ĭheerio is a tool for parsing HTML and XML in Node.js, and is very popular with over 23k stars on GitHub. Though you can do web scraping manually, the term usually refers to automated data extraction from websites - Wikipedia. Web scraping is the process of extracting data from a web page. Feel free to ask questions on the freeCodeCamp forum if you get stuck But you can still follow along even if you are a total beginner with these technologies. You should have at least a basic understanding of JavaScript, Node.js, and the Document Object Model (DOM).You need to have a text editor like VSCode or Atom installed on your machine.If you don't have Node, just make sure you download it for your system from the Node.js downloads page Here are some things you'll need for this tutorial: The sites used in the examples throughout this article all allow scraping, so feel free to follow along. It's your responsibility to make sure that it's okay to scrape a site before doing so. In this article, I'll go over how to scrape websites with Node.js and Cheerio.īefore we start, you should be aware that there are some legal and ethical issues you should consider before scraping a site. To get the data, you'll have to resort to web scraping. The data can be is delivered via our REST API or uploaded to your, Amazon S3, Dropbox, Box or FTP account, depending on your preferred method.There might be times when a website has data you want to analyze but the site doesn't expose an API for accessing those data. The data delivery formats and methods are just as customizable and you can choose between XML, JSON and CSV for data formats. The only task left for you to do would be to plug it into your data analytics system or database. We take complete ownership of the extraction process and deliver the data in a ready to use format. If your company doesn’t have the necessary resources to carry out the data extraction process, it’s better to outsource it to a DaaS (Data as a Service) provider like PromptCloud. Even more so if the page you need to crawl uses dynamic coding practices like JavaScript. Why use PromptCloud to crawl JavaScript rendered webpagesĮxtracting data from the web is a niche process that demands high end technical skills and an extensive tech stack. The method used for different webpages varies according to the requirement, like the frequency of crawl, use case, latency and other similar factors. This is significantly complicated than the browser method, but the extraction is smoother and faster without errors. Other methods include extracting the data by using a custom program written specifically to render and extract data from the specific page to be scraped. This method is however, not that efficient and there is a possibility of errors and bottlenecks every now and then. The browser is then controlled by an automation tool like Selenium to navigate to different pages. ![]() In this method, the web crawler is equipped with a browser that can do the rendering part before it can extract the data. There are different ways to tackle the JavaScript rendered webpages issue and the easiest is to employ a web browser to render the page first. ![]()
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