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How to scrape data from the Web using Node.js

, 6 Jan 2014
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This article shows you how to fetch data from the Web using the powerful Node.js

Introduction

Using Node.js , you can do what you want like a website for chat , a Social Network Like LinkedIn and Facebook and also you can fetch data from The Web.

Background

In the past, I have wrote this post on the different options you can use to scrape data from the Web using for the HtmlAgilityPack in .Net Development Environment. So you can do the same functionality using the powerful Node.Js .

So Node.js is a platform built on Chrome's JavaScript Runtime for easily building fast, scalable network application. Node.js uses an event-driven, non-blocking Input Output model that make it lightweight and  efficient, perfect for data-intensive real-time applications that run across distributed devices. you can download it here :  http://nodejs.org/ . 

Using the code

You Will need to install Node.js of course and on top it 3 packages:

  1. npm install request: we could work with the URLs in an easy way.
  2. npm install cheerio: Cheerio is a jQuery for the server side.
  3. npm install fs: We use this Package to make files.   

After you finish the installation process, you should start a JavaScript File that contains our Code. So the first thing you must do is call the modules we need in our application: 

var request= require('request'),
	cheerio = require('cheerio'),
	fs = require('fs'), 
	urls= []; // urls is a variable to store the urls of the pictures. 

After that we must add the main call to fetch data from the website, parse it and work on it . In this case, we will fetch the location of the picture founded on www.reddit.com as shown below:

request('http://www.reddit.com/', function(err,resp,body)
{
	if(!err && resp.statusCode == 200)
	{
		var $ = cheerio.load(body);
		$('a.title', '#siteTable').each(function(){
			
			var url = this.attr('href');
			if(url.indexOf('i.imgur.com')!=-1)
			{
			urls.push(url);
			}
		}); 

Now let's do something with the data we have : we will store the picture founded on the Directory called"img" that you must create it inside the directory of your work. 

                for (var i=0;i<urls.length;i++)
		{
			request(urls[i]).pipe(fs.createWriteStream('img/' + i +'.jpg'));
		}
	// now we will close the curly braces and end our program	
	}
}); 

Well done. Now, we have to type on The Node.js Command Prompt : Node Scrapping.js.

Now, you have all the pictures of the websites stored on your directory. 

Any comments are welcome! 

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Hadrich Mohamed
Student GlobalNet
Tunisia Tunisia
Software Engineering student in the International Institute of technology of Sfax (IIT),Microsoft Student Partner , IEEE IIT SB member, IIT Microsoft Club President And a condidate at Appli Academy 2013-2014.
I like creating Windows store, Android and Windows Phone 8 applications.
Mail : hadrichmed@gmail.com
Phone : +216 27 61 61 40
Follow on   LinkedIn

Comments and Discussions

 
QuestionWhat is the actual use of Node.js PinmemberTridip Bhattacharjee6-Jan-14 18:59 
AnswerRe: What is the actual use of Node.js PinprofessionalHadrich Mohamed26-Feb-14 22:55 
GeneralRe: What is the actual use of Node.js PinmemberTridip Bhattacharjee27-Feb-14 20:15 
AnswerRe: What is the actual use of Node.js PinprotectorDaveAuld31-May-14 2:27 
Question"npm install fs" does not work Pinmembermhn21728-Dec-13 0:06 
AnswerRe: "npm install fs" does not work PinmemberHadrich Mohamed28-Dec-13 3:36 
Generalfs works Pinmembermhn2172-Jan-14 2:14 
Questionno fs package Pinmemberej8ej27-Dec-13 12:11 
AnswerRe: no fs package Pinmemberpipiscrew28-Dec-13 0:23 
GeneralRe: no fs package PinmemberHadrich Mohamed28-Dec-13 3:53 
GeneralRe: no fs package Pinmemberej8ej29-Dec-13 9:24 
Questionuse nodeJSgui Pinmemberpipiscrew27-Dec-13 0:37 
QuestionHow to get only html without images PinmemberSunasara Imdadhusen25-Dec-13 23:33 
AnswerRe: How to get only html without images PinmemberHadrich Mohamed26-Dec-13 1:30 
QuestionNode.js is still confusing to me PinmemberChicken9925-Dec-13 21:56 
GeneralRe: Node.js is still confusing to me PinmemberGebbetje4-Jan-14 4:15 

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