Before React 18, server-rendered React markup marked its root element for hydration.
About 62,648 websites in the PageSourceSearch index contain the code that reveals it; the 39 highest-ranked are listed below.
How is React (server-rendered, up to 17) detected?
React 16 and 17 renderToString stamps the root element with a data-reactroot attribute, which stays in the served HTML. The discovery keyword is the exact bytes PageSourceSearch looks for in every stored page and script:
A literal is matched byte for byte, case-sensitively. Combine it with another keyword, a domain, a kind or a date filter on the search page to narrow the list. About React (server-rendered, up to 17)
Top 50 websites using React (server-rendered, up to 17)
Ranked by the domain's position in the crawl's ranked list (Common Crawl harmonic centrality), highest first. view source opens the stored page or script with the match highlighted. Computed 2026-10-04 15:20:13 UTC; the list stopped short of 50 because the search's budget ran out.
Questions about finding React (server-rendered, up to 17)
How does PageSourceSearch know a website uses React (server-rendered, up to 17)?
By the source itself: React 16 and 17 renderToString stamps the root element with a data-reactroot attribute, which stays in the served HTML. PageSourceSearch stores the raw HTML and first-party JavaScript of each crawled site and matches the keyword byte for byte, so every listed site's stored source contains it.
Is this a complete list of websites using React (server-rendered, up to 17)?
No. The page lists the 50 highest-ranked sites in the index whose source holds the keyword, out of about 62,648 websites that do; the count is the index's estimate at the time the list was computed. Run the keyword as a search to page through all of them, or add a kind or date filter.
How do I find websites that use React (server-rendered, up to 17) together with another technology?
Search for both keywords at once: several terms separated by spaces must all be found on the same site, or with the Same page toggle in the same page. For example data-reactroot with wp-content/plugins/ lists the WordPress sites that use React (server-rendered, up to 17).