Web Scraping & API Glossary

BackendNodeId is exposed in the a11y snapshot. Each node in the snapshot includes a backendNodeId that lets you map acce...

This feature allows opening a page in a tab or a window. newPage() can now be called with window options to choose where...

The CDP message ID generator can be configured by passing a custom idGenerator to the Connection constructor. This enabl...

To stop the xdg-open popup in Puppeteer, configure a Chrome policy URLAllowlist and use a Chrome binary that reads that ...

How to expose the url property for links If you need the full URL of a link in Puppeteer, use the url property that was ...

Fetch.enable wasn't found is raised when trying to enable the Fetch domain for a worker. The fix is to ignore this error...

Puppeteer now dispatches each CDP message in its own JavaScript task by scheduling dispatch with setTimeout. This ensure...

To open DevTools for a page in Puppeteer, use the new Page.openDevTools() method. It calls the DevTools interface for th...

Use the ignoreCache option with Page.reload to reload while ignoring the browser cache. ``js await page.reload({ ignoreC...

Fixes Puppeteer not waiting for all targets when connecting by only awaiting child targets for tab targets. When connect...

Summary The pageerror event may emit not only Error objects but also values of unknown type. Treat the payload as unknow...

The test server was removed from the release-please workflow to simplify the release process and remove an unnecessary e...

Answer Avoid blocks by scraping politely and limiting request rates. Respect robots.txt, identify your user agent, and s...

Answer Clean scraped data by trimming whitespace, normalizing formats, and removing duplicates. Validate fields with sch...

Answer Handle pagination by identifying the next page link, page parameter, or API cursor. Start from the first page and...

Answer Use a headless browser to render the page before extracting data. Wait for key selectors to appear or for network...

Answer Web crawling is about discovering and fetching pages, while web scraping is about extracting data from those page...

Answer Web scraping legality depends on the site terms, the data collected, and local laws. Public data may be allowed, ...

Answer Common tools include Beautiful Soup, Scrapy, Playwright, Puppeteer, and Selenium. Lightweight parsers are great f...

Answer Ethical scraping means minimizing harm and respecting site owners and users. Follow robots.txt, terms of service,...

Answer The best format depends on how you plan to use the data. CSV is simple and works well for tabular data and quick ...

Answer Web scraping is the process of extracting specific data from web pages and converting it into structured formats....

Answer Web crawling focuses on discovering and retrieving pages, while web scraping extracts specific data from those pa...

Answer Match crawl frequency to how often content changes and how quickly you need updates. High‑change sites may need m...

Answer To avoid getting blocked, crawl politely and predictably. Respect robots.txt, use reasonable rate limits, and ide...

Answer To crawl JavaScript‑heavy sites, use a headless browser to render pages before extracting content. Wait for criti...

Answer Web crawling legality depends on the website, the data you collect, and the laws in your jurisdiction. Many sites...

Answer Common web crawling tools include Scrapy, Apache Nutch, Playwright, Puppeteer, and managed crawler platforms. Scr...

Answer Common crawler data includes URLs, status codes, headers, page content, metadata, links, and timestamps. Many sys...

Answer Crawl budget is the number of pages a crawler can fetch within time and resource constraints. It is limited by yo...

Answer robots.txt is a file at a site root that tells crawlers which paths they may or may not access. It uses a simple ...

Answer Web crawling is the automated process of discovering and fetching web pages by following links so you can build a...