yasserg/crawler4j
Open Source Web Crawler for Java observed · 2026-08-28
Health v2 · maintenance only
23/100
- Activity 0
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5359
- days_rel: n/a
- days_push: 1763
- n_releases_24m: 0
Adoption not part of the score
4618 stars · 1897 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
crawler4j is an open-source web crawler library for Java that provides a simple interface for building multi-threaded web crawlers in minutes. Users extend a WebCrawler class to decide which URLs to visit and how to process fetched pages.
Use cases
- crawl a website and extract all pages
- build a multi-threaded web crawler in Java
- scrape HTML content and extract links from pages
- collect data from websites for indexing or analysis
- filter which URLs the crawler should visit
- download and parse web pages at scale
When to choose
- you need a simple, ready-to-use crawler on the JVM
- you want multi-threaded crawling with minimal setup
- you need URL filtering and HTML parsing out of the box
When to avoid
- you need a JavaScript-rendered (headless browser) crawler
- you need a distributed or highly scalable crawling system
- you're not working on the JVM platform
- you need actively maintained software with recent releases
Facets
library · maturity maintenance
web-scraping http-client parser crawlers web-development developer-tools jvm cross-platform web-crawler java multi-threaded html-parsing
1 source
- readme: https://github.com/yasserg/crawler4j · fetched 2026-08-28 · 1df6c1609c45
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| yasserg/crawler4j | main | 23 |
For agents
markdown · JSON · MCP: product_card(name="yasserg/crawler4j")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem