node-crawlervscolly

MIT 30 6 6,790

15.3 thousand (month) Sep 10 2012 2.0.2(2025-05-28 09:36:01 ago)

25,231 7 187 Apache-2.0

May 14 2018 v2.2.0(2025-03-27 10:47:28 ago)

node-crawler is a popular web scraping library for Node.js that allows you to easily navigate and extract data from websites. It has a simple API and supports concurrency, making it efficient for scraping large numbers of pages.

Features:

Server-side DOM & automatic jQuery insertion with Cheerio (default) or JSDOM,
Configurable pool size and retries,
Control rate limit,
Priority queue of requests,
forceUTF8 mode to let crawler deal for you with charset detection and conversion,
Compatible with 4.x or newer version.
Http2 support
Proxy support

Colly is a popular web scraping library for the Go programming language. It's designed to be fast and easy to use, and it provides a simple and flexible API for traversing and extracting information from websites.

Colly supports:

Concurrent scraping with a simple API
Automatic handling of cookies and sessions
Automatic handling of redirects
Support for parsing HTML and XML
Support for parsing JSON and binary data
Support for custom storage (e.g. scraping results to a database)
Simple JavaScript rendering with Colly's built-in rendering engine.

Colly also provides several optional features, such as support for user-agents, delay between requests, rate-limiting and proxy usage.

Colly's API is quite simple, and it is easy to get started with basic web scraping tasks. It's a good choice for scraping moderate to heavy sites, and it can be useful for a wide range of use cases, such as data mining, content extraction, and more.

Additionally, you can use it together with Goquery, a library that allow you to make jquery like queries on HTML documents and it is often used together with Colly to ease the way of parsing the HTML.

Highlights

popularcss-selectorsxpath-selectorscommunity-toolsoutput-pipelinesmiddlewaresasyncproductionlarge-scale

Example Use

```javascript const Crawler = require('crawler'); const c = new Crawler({ maxConnections: 10, // This will be called for each crawled page callback: (error, res, done) => { if (error) { console.log(error); } else { const $ = res.$; // $ is Cheerio by default //a lean implementation of core jQuery designed specifically for the server console.log($('title').text()); } done(); } }); // Queue just one URL, with default callback c.queue('http://www.amazon.com'); // Queue a list of URLs c.queue(['http://www.google.com/','http://www.yahoo.com']); // Queue URLs with custom callbacks & parameters c.queue([{ uri: 'http://parishackers.org/', jQuery: false, // The global callback won't be called callback: (error, res, done) => { if (error) { console.log(error); } else { console.log('Grabbed', res.body.length, 'bytes'); } done(); } }]); // Queue some HTML code directly without grabbing (mostly for tests) c.queue([{ html: '

This is a test

' }]); ```

```go package main import ( "fmt" "github.com/gocolly/colly/v2" ) func main() { // Instantiate default collector c := colly.NewCollector( // Visit only domains: hackerspaces.org, wiki.hackerspaces.org colly.AllowedDomains("hackerspaces.org", "wiki.hackerspaces.org"), ) // On every a element which has href attribute call callback c.OnHTML("a[href]", func(e *colly.HTMLElement) { link := e.Attr("href") // Print link fmt.Printf("Link found: %q -> %s\n", e.Text, link) // Visit link found on page // Only those links are visited which are in AllowedDomains c.Visit(e.Request.AbsoluteURL(link)) }) // Before making a request print "Visiting ..." c.OnRequest(func(r *colly.Request) { fmt.Println("Visiting", r.URL.String()) }) // Start scraping on https://hackerspaces.org c.Visit("https://hackerspaces.org/") } ```

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