# monperrus/crawler-user-agents

Syntactic patterns of HTTP user-agents used by bots / robots / crawlers / scrapers / spiders. pull-request welcome :star:

Repository: https://github.com/monperrus/crawler-user-agents
Canonical: https://ross.abutalabs.com/products/crawler-user-agents
Language: Go
License: MIT
License Family: permissive
Last push: 2026-08-07T13:40:25+00:00

## Health v2 (maintenance only)
Score: 75/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 96, release rhythm 35, longevity 100
- inputs: {"age_days": 4562, "days_push": 26, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1400, forks 289 (observed 2026-08-28T04:04:37.103121+00:00)

## What it is
A curated JSON dataset of regular-expression patterns matching HTTP user-agents used by bots, crawlers, spiders, and scrapers. It is distributed as packages for JavaScript/Node.js, Python, and Go, with helper functions like is_crawler/IsCrawler for bot detection.

## Use cases
- detect bot traffic in web server logs
- block crawlers and scrapers from hitting my API
- check if a user-agent string is a search engine bot
- filter out spider requests from analytics
- identify known bots by user-agent header
- exclude crawler traffic from rate limiting

## When to choose
- you need a simple, regex-based list of known bot user-agents
- you want bot detection in Node.js, Python, or Go without heavy dependencies
- you need to filter or flag automated traffic in logs or middleware

## When to avoid
- you need behavioral bot detection beyond user-agent strings
- you need a continuously updated commercial bot-fingerprinting service
- you need to detect malicious bots that spoof legitimate user-agents

## Facets
- artifact type: dataset
- maturity: active
- function: data-generation, security, http-server, middleware
- domain: web-development, security, developer-tools, crawlers
- platform: python, go, cross-platform
- tags: user-agents, bot-detection, regex-patterns, crawler-detection, -dataset, nodejs

## Member repositories
- monperrus/crawler-user-agents (main) score 75

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:37.103121+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:39:06.955845+00:00, confidence not recorded.
  - readme: https://github.com/monperrus/crawler-user-agents (fetched 2026-08-28T04:04:37.103121+00:00, sha bdef23f0c0a5)
- Data as of 2026-08-30T08:39:29.467469+00:00.