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The exact version used in the SEO Spider can be viewed within the app (‘Help > Debug’ on the ‘Chrome Version’ line). Like Google we use Chrome for our web rendering service (WRS) and keep this updated to be as close to ‘evergreen’. This means pages are fully rendered in a headless browser first, and the rendered HTML after JavaScript has been executed is crawled. Traditionally website crawlers were not able to crawl JavaScript websites either, until we launched the first ever JavaScript rendering functionality into our Screaming Frog SEO Spider software. While Google are generally able to crawl and index most JavaScript content, they still advise using server-side rendering or pre-rendering, rather than relying on a client-side approach as its ‘difficult to process JavaScript, and not all search engine crawlers are able to process it successfully or immediately’.ĭue to this growth and search engine advancements, it’s essential to be able to read the DOM after JavaScript has been executed to understand the differences to the original response HTML when evaluating websites. Google evolved and deprecated their old AJAX crawling scheme, and now renders web pages like a modern-day browser before indexing them. However with growth in JavaScript rich websites and frameworks such as Angular, React, Vue.JS, single page applications (SPAs) and progressive web apps (PWAs) this changed. ![]() Historically search engine bots such as Googlebot didn’t crawl and index content created dynamically using JavaScript and were only able to see what was in the static HTML source code.
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