Step-by-step Guide to Build a Web Crawler for Beginners

Octoparse
5 min readNov 13, 2023

Originally published as https://reurl.cc/dmoZQM

As a newbie, I built a web crawler and successfully extracted 20k data from the Amazon Careers website. Want to know how to make a web crawler and create a database that eventually turns into your asset at no cost? This article will share with you the different ways including coding and no-coding ways step by step.

What Is A Web Crawler

A web crawler is an internet bot that indexes the content of websites (read the detailed definition on Wikipedia). It can automatically extract target information and data from websites and export data into structured formats (list/table/database). Here is a video that explains the web crawler and the difference between web crawlers and web scrapers.

You may be curious about is web crawler legal or not, well, it depends. But generally speaking, it’s totally legal in most countries to crawl public data on a website.

Why Do You Need A Web Crawler

Imagine a world without Google Search. How long do you think it will take to get a recipe for chicken nuggets from the Internet? There are 2.5 quintillion bytes of data being created online each day. Without search engines like Google, it will be like looking for a needle in a haystack.

From Hackernoon by Ethan Jarrell

A search engine is a unique kind of web crawler that indexes websites and finds web pages for us. Besides search engines, you can also build a customized web crawler to help you achieve:

1. Content aggregation: It works by compiling information on niche subjects from various resources into one single platform. As such, it is necessary to crawl popular websites to fuel your platform in time.

2. Sentiment analysis: It is also called opinion mining. As the name indicates, it is the process of analyzing public attitudes toward one product or service. It requires a monotonic set…

--

--

Octoparse

Web scraping at a large scale without coding. Start simple, for free. www.octoparse.com