#Web scraping in nodejs code#
Your code will look something like:Ĭonst fetch = require ( 'node-fetch' ) const DATA_URL = '' const loadMessiGoals = async ( ) => ). You can also use the raw HTTP/S module, but it doesn’t even support async, so I’ve picked node-fetch for this task. To load the page from the node environment you will need to use your favorite request library. FetchingĪs an example of this guide, we will scrape a goal data for Messi from Transfermarkt. But all this wouldn’t be covered in the current guide, sorry.
That would be the easiest case for parsing, in sophisticated ones you can bump into some pagination, link navigation, dealing with bot protection (captcha), and even real-time site interaction.
save the data: write it to the database or dump it to the filesystem.process the data: filter it, transform it to your needs, prepare it for the future usage.extract the data from the page markup to some in-language structure (Object, Array, Set).If you are not so lucky and still need to do the scraping, here is the general overview of the process: Here 9gag is providing us all the post data in convenient format If data is not baked in the HTML like it is in half of the modern web applications, there is a good chance that you don’t need to scrape and parse at all. Open developer tools - F12 in most browsers - then switch to the Network tab and reload the page In our case, it would be a direct network request for data. Overview Check if data is available in requestīefore you will start to do any of the programming, always check for the easiest available way. I’ve tried to fill the spot and create ‘the missing doc’. If you would like to use technologies you are more familiar with, like ES2020, node, and browser APIs you will miss the direct guidance. And more importantly, the solution is not native to javascript developers.
The problem is that I’ve seen articles like this 5 years ago and this stack hasn’t mostly changed. Google results for 'web scraping tutorial'
#Web scraping in nodejs how to#
I’ve also seen few articles where they teach you how to parse HTML content with regular expressions, spoiler: don’t do this. The toolkit is pretty standard for these posts: python 3 (hopefully not second) as an engine, requests library for fetching, and Beautiful Soup 4 (which is 6 years old) for web parsing. If you’ll try to google “web scraping tutorial” you’ll get a bunch of tech articles on the subject that tells you how to achieve the result using python.
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