Headless browsers

A headless browser is a real web browser run by code, with no window on screen. Many sites now build their pages with JavaScript, so a plain HTTP request returns an empty shell. A headless browser loads the page as a visitor's browser would, runs its scripts and lets your code read the finished page, click buttons, scroll and fill forms.

There are two kinds of tool here. Automation libraries let you script browsers on your own machines, in several programming languages. Hosted browser services run those browsers in the cloud and let your script connect to them over the network, which saves you managing browser versions, memory and crashes on your own servers.

Use a browser only where you need one. A quick test is to open the page with JavaScript turned off. If the data is there, a plain request is faster and cheaper. If it is missing, check whether the page loads its data from a JSON endpoint you can see in the browser's network tab, since calling that directly is often simpler, as long as the site allows it.

When you compare libraries, look at language support, which browser engines they drive, how they wait for elements to be ready and how easy they are to debug. For hosted services, look at session limits, how long a session can live, where browsers run, and tools for watching recordings of failed runs.

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6 AI web scraping tools in headless browsers

Browserless

Hosted headless Chrome you connect to from Puppeteer or Playwright, with REST endpoints for content, PDFs and screenshots.

  • Developer API

Browserbase

Cloud headless browsers for automation and AI agents, with session recordings and debugging tools.

  • Developer API

Steel

Browser API for AI agents and automations, available as a hosted service and an open-source browser server.

  • Developer API
  • Open source

Playwright

by Microsoft

Browser automation library for Chromium, Firefox and WebKit, with APIs for Node.js, Python, Java and .NET.

  • Open source

Puppeteer

by Google Chrome team

Node.js library that controls Chrome or Firefox through a high-level API, often used for rendering and screenshots.

  • Open source

Selenium

by Selenium project

Long-standing browser automation project with WebDriver bindings in many languages and Grid for running browsers at scale.

  • Open source

Browsers are heavy. Each one uses much more memory and CPU than an HTTP client, so measure how many you can run at once and close sessions you no longer need. Block images and fonts when you only need text, which lightens the load on you and on the site.

The same rules apply as for any crawler. A browser makes your requests look like a visitor's, which is a reason to be more careful about pace and permissions, not less. Follow site terms and robots.txt, and keep personal data out unless you have a lawful basis.

Store screenshots or page snapshots for failed runs. When a script breaks, a picture of what the browser actually saw usually explains the problem faster than logs, whether it is a cookie banner, a changed button or a page that never finished loading.

Keep browser versions current. Sites test against recent browsers, and an old one can render pages wrongly.

Questions about headless browsers

How do I know whether a page needs a headless browser?

Load it with JavaScript turned off, or fetch it with a plain HTTP client. If the content you need is missing, the page builds it in the browser and you need rendering, or the data endpoint the page calls.

Should I run browsers myself or use a hosted service?

Running them yourself costs less at steady volume and keeps data local. A hosted service saves you managing versions, memory and crashes, and scales quickly. Many teams start hosted and move steady work in-house.

Why are my browser scripts flaky?

Usually the script reads the page before it finishes loading. Wait for the specific element or network response you need instead of a fixed delay, and add retries for pages that are slow.

Can I make a headless browser load faster?

Block images, fonts and media when you only need text, reuse browser contexts where safe, and skip pages that a plain request can handle. That also reduces load on the target site.

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