is-web-crawler

A javascript based library to check if the current user agent is a web crawler. It uses the list of known web crawlers using the package crawler-user-agents.

Get started

npm install is-web-crawler

Usage

Quick Usage

If you want to know if the current user agent is a web crawler.

import { isCrawlerUserAgent } from 'is-web-crawler';

const isCurrentUserAgentABot = isCrawlerUserAgent();

NOTE: The regex pattern matching under the hood is cached, so calling this method multiple times will not affect performance.

Only use the top X known crawlers

If you only want to tackle the top X web crawlers (from the list provided by crawler-user-agents), then simply pass in the number as an argument:

const topCrawlers = 10;
const isCurrentUserAgentABot = isCrawlerUserAgent(topCrawlers);

Checking a custom user agent string

There might a scenario where you want to check a custom user agent string, instead of the current user agent. In this case, you can use the isCrawler method instead.

import { isCrawlerUserAgent } from 'is-web-crawler';

const myUserAgent = ... get user agent ...;
const topCrawlers = 10;

// the second argument is optional
const isCurrentUserAgentABot = isCrawler(myUserAgent, topCrawlers);

NOTE: This method by passes the caching, so it if you need to cache the value, you need to implement this in your application.