JavaScript web scraping libraries are essential tools designed to extract data from online pages efficiently, offering capabilities like sending HTTP requests, parsing HTML, and rendering JavaScript-based content. These libraries can be categorized into types such as HTTP clients, all-in-one frameworks, and headless browser tools, with popular examples including Playwright, Cheerio, Axios, Puppeteer, Crawlee, and node-curl-impersonate. Playwright is renowned for its advanced capabilities, including support for multiple browsers and dynamic websites, while Cheerio is appreciated for its lightweight, jQuery-like syntax for HTML parsing. Axios stands out as the most popular for making HTTP requests, though it requires pairing with other tools for HTML parsing. Puppeteer and Crawlee offer robust automation for dynamic pages, with Crawlee providing additional solutions for common web scraping challenges. Despite their utility, these libraries face challenges such as IP blocks and CAPTCHAs, which can be mitigated through solutions like Bright Data's proxy and scraping services.