The Node.js web scraping tutorial provides a comprehensive guide on building a web crawler using Node.js to scrape websites and store data in a Firebase database. It explains the use of Node.js worker threads to optimize CPU-intensive operations and introduces tools such as Axios for HTTP requests and Cheerio for DOM manipulation. The tutorial outlines the creation of a web crawler to extract currency exchange rates, demonstrating how to format and store this data efficiently using worker threads. Additionally, it discusses the use of node-crawler, an alternative tool that offers advanced features like rate limiting and maximum connection settings, to enhance the web scraping process. The article also compares various open-source web crawlers, highlighting their capabilities in different programming languages, and touches on the legal considerations of web scraping, emphasizing the importance of adhering to website policies.