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gocolly/colly

This system is a Go-based web scraping and crawling framework that provides a flexible API for extracting data from websites. It supports concurrent and parallelized crawling through request queues and controlled concurrency, while offering robust configuration options like rate limiting, proxy rotation, and URL filtering. The library also includes utilities for debugging, caching, and handling authenticated or multipart requests, enabling users to build scalable scrapers for diverse content types.

64.3

Adequate · 1 August 2026

5k

lines of production code

Go

primary language

3

bus factor · 138 authors in all

3

measurements over time

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How it got here

2017 · API modernization and example expansion

This period focused on modernizing the Colly API by introducing functional options for collector initialization and adding comprehensive examples for various scraping scenarios. Key features included HTTP tracing, round-robin proxy switching, and debuggers, alongside a significant expansion of the examples directory to demonstrate best practices.

20 changes

2018–2019 · Scraping examples and concurrency support

This period focused on expanding the library's capabilities for concurrent crawling by introducing a request queue and an in-memory storage backend. The team also added several new scraping examples for platforms like Reddit, Shopify, and local files, while updating Go dependencies to support modern module management.

9 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 1 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit 20d31482af — the exact code this score is about.
  • Scored under rubric rubric-2026.08.18. Score the same commit under that rubric and you get the same number.
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