We live in an era when making data-driven business decisions is the number one priority for many companies. To fuel these decisions, companies track, monitor, and record relevant data 24/7. Fortunately, there is a lot of public data stored on servers across websites that can help businesses to stay sharp in the competitive market.
It has become common for various companies to extract data for their business purposes. However, this is not one of those processes that you can implement in your day to day operations before getting informed. For this reason, in this article, we shall go through how web data extraction works, its main challenges, and introduce you to several solutions that can help you as you go further up the data scraping path.
How data extraction works
If you are a not-that-tech-savvy person, data extraction can seem like a very complex and incomprehensible matter. However, it is not that complicated to comprehend the entire process.
The process of extracting data from websites is called web scraping. Sometimes you can find it referred to as web harvesting as well. The term typically refers to an automated data extraction process using a bot or a web crawler. Sometimes the concept of web scraping is confused with web crawling. For this reason, we have covered this issue in our other blog post about the main differences between web crawling and web scraping.
Now, we will discuss the whole process to fully understand how data extraction works.
What makes data extraction possible
Nowadays, the data we scrape is mostly represented in HTML, a text-based mark-up language. It defines the structure of the website’s content via various components, including tags such as <p>, <table>, and <title>. Developers are able to come up with scripts that pull data from any manner of data structures.
Building data extraction scripts
Everything starts with building data extraction scripts. Programmers skilled in programming languages like Python can develop data extraction scripts, so-called scraper bots. Python advantages such as diverse libraries, simplicity, and active community make it the most popular programming language for writing web scraping scripts. These scripts can automate data extraction completely. They send a request to a server, visit the chosen URL, go through every previously defined page, HTML tag, and components. Then they pull data from them.
Developing various data crawling patterns
Data extraction scripts can be custom-tailored to extract data from only specific HTML components. The data you need to get extracted depends on your business goals and objectives. There is no need to extract everything when you can specifically target just the data you need. This will also put less strain on your servers, reduce storage space requirements, and make data processing easier.
Setting up the server environment
To continually run your web scrapers, you need a server. So the next step in this process is investing in server infrastructure or renting servers from an established company. Servers are a must-have as they allow you to run your data extraction scripts 24/7 and streamline data recording and storing.
Ensuring there is enough storage space
The deliverable of data extraction scripts is data. Large scale operations come with high storage capacity requirements. Extracting data from several websites translates into thousands of web pages. Since the process is continuous, you will end up with huge amounts of data. Ensuring there is enough storage space to sustain your scraping operation is very important.
Acquired data comes in raw form and may be hard to comprehend to the human eye. Therefore, parsing and creating well-structured results is the next important part of any data gathering process.
Data extraction tools
There are several ways to extract public data from a webpage – building an in-house tool or using a ready-to-use web scraping solution such as Oxylabs Real-Time Crawler.
Building an in-house data extraction tool might be a good choice if your company has a dedicated team of experienced developers and resources. However, most websites or search engines are not eager to give their data away and have built algorithms detecting bot-like activity, thus making scraping more challenging.
Here are the main stages of how to extract data from a web:
1. Decide the type of data you want to fetch and process.
2. Find where the data is displayed and build a scraping path.
3. Import and install the required prerequisites.
4. Write a data extraction script and implement it.
Imitating the behavior of a regular internet user is essential in order to avoid IP blocks. This is where proxies step in and make the entire process of any data harvesting task easier. We will come back to this later.
One of the main benefits of tools like Real-Time Crawler is its ability to help you extract public data from challenging targets without additional resources. Large search engines or e-commerce web pages make use of sophisticated anti-bot algorithms. Therefore, scraping them requires extra development time.
In-house solutions would have to create workarounds through trial and error, which means inevitable slowdowns, blocked IP addresses, and an unreliable flow of pricing data. With Real-Time Crawler, the process is entirely automatic. Instead of endlessly copy-pasting, your employees will be able to focus on more pressing matters and move straight to data analysis.
Benefits of web data extraction
Big data is a new buzz word in the business world. It encompasses various processes done on data sets with a few goals – gaining meaningful insights, identifying trends and patterns, and forecasting economic conditions. For example, web scraping real estate data helps to analyze essential influences in this industry. Also, web scraping can be useful in the automotive industry. Businesses collect automotive industry data such as users and auto parts reviews, and much more.
Various companies extract data from websites to make their data sets more relevant and up-to-date. This practice often extends to other websites as well, so that the data set can be complete. The more data, the better, as it provides more reference points and renders the entire data set more valid.
Which data do businesses target for extraction?
As we mentioned earlier, it is understandable that not all online data is the target of extraction. Your business goals, needs, and objectives should serve as main guidelines when deciding which data to pull.
There can be loads of data targets that could be of interest to you. You can extract product descriptions, prices, customer reviews and ratings, FAQ pages, how-to guides, and more. You can also custom-tailor data extraction scripts to target new products and services. Just make sure that you are scraping public data and not breaching any third party rights before conducting any scraping activities.
Common data extraction challenges
Website data extraction doesn’t come without challenges. The most common ones are:
- Resources and knowledge. Data gathering requires a lot of resources and professional skills. If companies decide to start web scraping, they need to develop a particular infrastructure, write scraper code, and oversee the entire process. It requires a team of developers, system administrators, and other specialists.
- Maintaining data quality. Maintaining data quality across the board is of vital importance. At the same time, it becomes challenging in large-scale operations due to data amounts and different data types.
- Anti-scraping technologies. To ensure the best shopping experience for their consumers, e-commerce websites implement various anti-scraping solutions. In web scraping, one of the most important parts is to mimic organic user behavior. If you send too many requests in a short time interval or forget to handle HTTP cookies, there is a chance that servers will detect the bots and block your IP.
- Large-scale scraping operations. E-commerce websites regularly update their structure, requiring you to update data extraction scripts constantly. Prices and inventory are also subject to constant change, and you need to keep the data extraction scripts going always running.
Best practices of data scraping
The challenges related directly to data extraction can be solved with a sophisticated data extraction script developed by experienced professionals. However, this still leaves you exposed to the risk of getting picked up and blocked by anti-scraping technologies. This calls for a game-changing solution – proxies. More precisely, rotating proxies.
Rotating proxies will provide you with access to a large pool of IP addresses. Sending requests from IPs located in different geo regions will trick servers and prevent blocking. Additionally, you can use a proxy rotator. Instead of manually assigning different IPs, the proxy rotator will use the IPs in the proxy data center pool and automatically assign them.
If you do not have the resources and team of experienced developers to start web scraping, it is time to consider a ready-to-use solution such as a Real-Time Crawler. It ensures 100% delivery from search engines and e-commerce websites, and streamlines data management, and aggregates data so that you can understand it easily.
Is it legal to extract data from websites?
While many businesses rely on big data, the demand has grown significantly. According to research by Statista, the big data market is increasing enormously every year and is forecasted to reach 103 billion U.S. dollars by 2027. It leads to more and more businesses adopting web scraping as one of the most common data collection methods. Such popularity evokes a widely discussed question of whether web scraping is legal.
Since this complex topic has no definite answer, one must ensure that any carried out web scraping does not breach any laws surrounding the said data. It is important to note that before engaging in any scraping activity, we firmly suggest seeking professional legal consultation regarding the specific situation.
Also, we strongly urge you to stay away from scraping any data that is non-public unless you have explicit permission from the target website. For clarity, nothing that was written in this article should be interpreted as advice of scraping any non-public data.
If you want to learn more about web scraping legality, read our article Is web scraping legal? where we have covered the topic in detail from the ethical and technical side.
To sum it up, you will need a data extraction script to extract data from a website. As you can see, building those scripts can be challenging due to the scope of operation, complexity, and changing website structures. Since web scraping has to be done in real-time to get the most recent data, you will have to avoid getting blocked. This is why major scraping operations run on rotating proxies.
If you feel that your business requires an all-in-all solution that makes data extraction effortless, you can register and start using Oxylabs’ Real-Time Crawler right away. However, if you have some unanswered questions, feel free to discuss your case with our sales team by clicking here and booking a call.