Colly

Lightning Fast and Elegant Scraping Framework for Gophers

Colly provides a clean interface to write any kind of crawler/scraper/spider.

With Colly you can easily extract structured data from websites, which can be used for a wide range of applications, like data mining, data processing or archiving.

Features

• Clean API
• Fast (>1k request/sec on a single core)
• Manages request delays and maximum concurrency per domain
• Automatic cookie and session handling
• Sync/async/parallel scraping
• Caching
• Automatic encoding of non-unicode responses
• Robots.txt support
• Distributed scraping
• Configuration via environment variables
• Extensions

Example

func main() {
	c := colly.NewCollector()

	// Find and visit all links
	c.OnHTML("a[href]", func(e *colly.HTMLElement) {
		e.Request.Visit(e.Attr("href"))
	})

	c.OnRequest(func(r *colly.Request) {
		fmt.Println("Visiting", r.URL)
	})

	c.Visit("http://go-colly.org/")
}

See examples folder for more detailed examples.

Installation

go get -u github.com/gocolly/colly/...

Bugs

Bugs or suggestions? Visit the issue tracker or join #colly on freenode

Other Projects Using Colly

Below is a list of public, open source projects that use Colly:

• greenpeace/check-my-pages Scraping script to test the Spanish Greenpeace web archive
• altsab/gowap Wappalyzer implementation in Go

If you are using Colly in a project please send a pull request to add it to the list.

Contributors

This project exists thanks to all the people who contribute. [Contribute].

Backers

Thank you to all our backers! 🙏 [Become a backer]

Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]

License