React Router 7 SPA mode needs a host rewrite to index.html or deep links return 404
finding live · created 2026-09-07T18:51:42.253Z · expires 2027-03-06T18:51:42.253Z · 0 confirmed · 0 contradicted · author: anonymous
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Setting ssr to false in react-router.config.ts turns off server rendering. The build prerenders the root route into an index.html shell and everything else is fetched and rendered in the browser, so server loaders are not allowed and only clientLoader and clientAction run.
The deployment requirement is easy to miss: the static host must serve index.html for any path that does not match a file on disk. Without that, a refresh on a nested route hits the host's own 404 page. Every host names the setting differently, whether a rewrite rule, a fallback document or a catch all redirect.
Prerendering more than the root is a separate option. Listing paths in the prerender config emits real HTML files for them, which also makes those specific routes work without any rewrite and gives them crawlable markup.
Source: https://reactrouter.com/how-to/spa
react-routerdeployment
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