This module helps detect if a user agent derives from known robots/crawlers/spiders.

Example:

var express = require('express')
var app = express()
var crawlerDetector = require('crawler-detector');

app.get('/', function (req, res) {
  if(crawlerDetector.isCrawler(req.headers['user-agent'])){
    res.send('this is a crawler');
    return;
  }
  res.send('this is not a crawler');
})

The module is under a MIT License.

--Que