serp

This module allows to get the result of a Google search based on a keyword.

It provides different options for scraping the google results called SERP (Search Engine Result Page) :

• delay between requests
• retry if error
• with or without proxy, proxies or scrape API.

Installation

$ npm install serp -S

Simple usage

const serp = require("serp");

var options = {
  host : "google.be",
  qs : {
    q : "test",
    filter : 0,
    pws : 0
  },
  num : 100
};

const links = await serp.search(options);

Understanding the options structure :

• For google.com, the param host is not necessary.
• qs can contain the usual Google search parameters : https://moz.com/ugc/the-ultimate-guide-to-the-google-search-parameters.
• options.qs.q is the keyword
• num is the number of desired results (defaut is 10).
• The options object can also contain all request options like http headers, ... . SERP is using the request module : https://github.com/request/request
• The user agent is not mandatory. Default value will be : 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.1'

Delay between requests

It is possible to add a delay between each request made on Google with the option delay (value in ms). The delay is also applied when the tool read the next result page on Google.

const serp = require("serp");

var options = {

  qs : {
    q : "test"
  },
  num : 100,
  delay : 2000 // in ms
};

const links = await serp.search(options);

Retry if error

If an error occurs (timeout, network issue, invalid HTTP status, ...), it is possible to retry the same request on Google. If a proxyList is set into the options, another proxy will be used.

const serp = require("serp");

var options = {

  qs : {
    q : "test"
  },
  num : 100,
  retry : 3,
  proxyList : proxyList
};

const links = serp.search(options);

Get the number of results

You can get the number of indexed pages in Google by using the following code.

const serp = require("serp");

var options = {
  host : "google.fr",
  numberOfResults : true,
  qs : {
    q   : "site:yoursite.com"
  },
  proxyList : proxyList
};

const numberOfResults = await serp.search(options);

With proxy

You can add the proxy reference in the options

const serp = require("serp");

var options = {
  qs : {
    q : "test",
  },
  proxy : "http://username:[email protected]:port"  
};


const links = await serp.search(options);

With multiple proxies

You can also use the module simple proxy if you have several proxies (see : https://github.com/christophebe/simple-proxies). In this case, a different proxies (choose randomly) will be used of each serp.search call.

See this unit test to get the complete code.

const  serp = require("serp");

var options = {
  qs : {
    q : "test",
  },
  proxyList : proxyList
};

const links = await serp.search(options);

with a scrape API

This module can use a scrape API instead of a list of proxies.

This is an example with scrapeapi.com

const options = {
      num: 10,
      qs: {
        q: 'test'
      },
      scrapeApiUrl: `http://api.scraperapi.com/?api_key=${ accessKey }`
    };

    try {
      const links = await serp.search(options);

      // console.log(links);
      expect(links).to.have.lengthOf(10);
    } catch (e) {
      console.log('Error', e);
      expect(e).be.null;
    }

Proxies or Scrape API ?

If you make many requests at the same time or over a limited period of time, Google may ban your IP address. This can happen even faster if you use particular search commands such as: intitle, inurl, site:, ...

It is therefore recommended to use proxies. The SERP module supports two solutions:

• Datacenter proxies like for example those proposed by Mexela. Shared proxies are more than enough.

• Scrape APIs such as scrapeapi.com

What to choose? Datacenter proxies or Scrape API ?

It all depends on what you are looking for. Datacenter proxies will provide the best performance and are generally very reliable. You can use the "retry" option to guarantee even more reliability. It's also a solution that offers a good quality/price ratio but it will require more effort in terms of development, especially for the rotation of proxies. If you want to use rotation with datacenter proxies, see this unit test.

Although slower, the scrape APIs offer other features such as the geolocation of IP addresses over a larger number of countries and the ability to scrape dynamic pages. Using such an API can also simplify the code. Unfortunately, this solution is often more expensive than data center proxies. So, scrape APIs becomes interesting if you have other scrape needs.