Semalt Provides A Comparison Of Javascript With Other Languages For Web Scraping

JavaScript (abbreviated as JS) is a dynamic, multi-paradigm and high-level programming language. Just like Python, HTML, CSS, and Ruby, JavaScript is used to make websites interactive and scrape data from the net. Almost all websites and blogs employ JavaScript, and the modern web browsers support it due to its built-in engines.

Role of JavaScript in web scraping:

As a multi-paradigm language, JavaScript supports different web scraping and data extraction projects. It uses an API for scraping text and images and for working with regular expressions. The JavaScript engines are embedded in different types of scraping software and help download readable and scalable data to your hard drive instantly.

Java and JavaScript – The best language for web scraping:

There are various similarities between Java and JavaScript, including language names, standard libraries, and syntax. Still, JavaScript is far better than Java and is widely used to build web scraping and screen scraping software. Sometimes the data we want to scrape is not present in the organized form. It may be generated dynamically (using AJAX, cookies, and redirects). It is possible to transform unorganized and raw data into the structured and organized form using specific JavaScript codes. Compared to this, Java provides a limited number of features and options and makes it difficult for us to organize data properly.

JavaScript and Python:

Unfortunately, JavaScript is not as effective as Python. The Python libraries play a significant role in web scraping. For instance, BeautifulSoup and Scrapy are widely used to extract data from dynamic sites, HTML and XML files, PDF documents and private blogs. Plus, Python works with your favorite parser and provides idiomatic ways of navigating, searching, and modifying a parse tree. It saves your time and energy and ensures the provision of well-scraped data. Unlike JavaScript, Python helps undertake complex data scraping projects, and we can accomplish multiple tasks at a time.

Comparison of JS and Ruby:

Ruby is good at production deployments, and string manipulations in Ruby are far better than JavaScript. Also, Ruby helps analyze the web pages appropriately and makes it easy for us to scrape content. It can deal with broken HTML files and can scrape data from them instantly. Unfortunately, JavaScript is not capable of scraping data from broken XML and HTML files. Ruby also has various extensions, such as Loofah and Sanitize, which help clean up the broken HTML codes. The only disadvantage of Ruby is that it lacks machine learning and NLP toolkits.


If you want to scrape data from dynamic or complex sites on a regular basis, JavaScript is not the right language for you. However, you can use JavaScript-based traffic-tracking tools (like Google Analytics) to accomplish other tasks. In this data-driven world, you need to be constantly vigilant, as information keeps changing all the while. With JavaScript, it is not possible to get readable and scalable data efficiently. It means both Ruby and Python are far better than JavaScript and help scrape information from multiple web pages. JS is good only for building basic web crawlers and data scrapers. It is easy to code and allows us to index our web pages without blocking any part of our code.