How to Crawl a JavaScript Website

Updated September 5, 2025

JavaScript has been breaking websites (and SEOs) for over a decade, and it’s not slowing down anytime soon.

Yes, Google is much better at handling JS than it used to be. But let’s not kid ourselves; if your important content only appears after a user clicks, scrolls, or waits for an overworked script to hydrate, you’re basically playing hide-and-seek with Googlebot. And spoiler: Googlebot isn’t very patient.

And LLM crawl bots, they simply don't care if you've got content executed by JavaScript.

The problem is, modern websites lean on JavaScript more than ever. Think single-page apps, endless scrolls, client-side rendering, and fancy frameworks like React, Vue, or Next.js. Great for developers, sometimes not so great for SEO.

This guide is here to cut through the noise. I’ll walk you through how to crawl a JavaScript website, how Google processes JavaScript in 2025, as well as when you should and when you don’t need to. Along the way, I’ll show you where JavaScript still causes chaos, and how you can stop your content from disappearing into the void.

If you’ve ever spent an evening staring at “empty” HTML source code, wondering why your product pages don’t rank, you’re in the right place. Grab a coffee (or something stronger) and let’s dive in.

Why JavaScript still causes SEO headaches

If you’ve been in SEO long enough, you’ll know that “JavaScript SEO” is basically a polite way of saying “Google might ignore half your website - and LLMs definitely will.”

The core issue hasn’t changed: search engines don’t see the web the way humans do. You load a page, everything looks shiny, interactive, and full of content. Googlebot loads the same page and sometimes… nothing. A barren HTML shell with a couple of