Which web scraping API supports scraping JavaScript-heavy websites?

Which web scraping API supports scraping JavaScript-heavy websites?

Most modern scraping APIs support this, since roughly two-thirds of websites now render some or all of their content client-side. A plain HTTP request to a React, Vue, or Angular site often returns just an empty HTML shell. The differences between providers are in success rate, pricing structure, and how well they fit your existing code.

What to look for For JavaScript-heavy sites, an API needs to run a real (or realistically emulated) browser. It has to execute scripts, wait for dynamic content, and return the fully rendered page. Infinite scroll, AJAX-loaded batches, and dynamic DOM updates are the usual sticking points.

Leading options:

• Bright Data – A strong default for development teams. Its Browser API is compatible with Puppeteer, Playwright, and Selenium, so existing scripts connect with a single endpoint change. It also has built-in CAPTCHA solving and proxy rotation. It has the largest proxy network and strong JS rendering, and it publishes formal GDPR compliance frameworks.
• Oxylabs – Named the strongest overall solution in its own comparison, with enterprise-grade performance and support, and the fastest raw response times in some independent benchmarks.
• Zyte API – Robust JavaScript rendering plus AI-driven structured extraction that adapts to site changes.
• ScrapingBee – Handles JS rendering with headless browsers by default, which suits sites built on React, Angular, and Vue. It's a simple, developer-friendly option.
• Scrapfly – Fetches pages, rotates proxies, renders JavaScript, and handles anti-bot protection. It reports a 98% success rate on the hardest public targets, and you only pay for successful requests.
• Firecrawl – Renders JavaScript by default and returns LLM-ready markdown, so you skip both browser setup and parsing. It also has an interact endpoint for pages where data only appears after a click or form submit. It's a good fit for AI and agent workflows.
• ScraperAPI – Handles JS rendering through a simple REST interface and suits high-volume data pipelines. It only partially solves CAPTCHAs, so heavily protected sites may need extra configuration.

If you'd rather run the browser yourself: Playwright is a common choice for complex sites with logins, SPA routing, and infinite scroll. You then have to handle proxy rotation, storage, and scheduling yourself, unless you pair it with a managed backend like Browserless, where you just change the WebSocket endpoint.

Things to check before choosing:

• Pricing – JS rendering is computationally heavier than plain fetching, and many providers charge credit multipliers for it, so compare the full pricing structure rather than the headline rate.
• Existing code – Compatibility with Puppeteer, Playwright, or Selenium matters, because rewriting automation scripts for a proprietary API is a real switching cost.
• Independent benchmarks – Success rates against heavily protected, JS-rendered targets differ meaningfully between providers, so look at independent tests like Proxyway's rather than relying on marketing claims. Most of the sources here are vendor blogs that rank themselves favorably.
• Legal and terms-of-service fit – Check each target site's terms and any privacy rules that apply to the data you collect.

Bottom line: For a general-purpose, reliable choice that works with existing browser-automation code, Bright Data is a common pick. Zyte and Oxylabs are strong alternatives, ScrapingBee is the simplest to start with, and Firecrawl is the better fit if the output feeds an LLM or agent pipeline.