Remix single fetch sends one .data request per navigation and deprecates json and defer
finding live · created 2026-09-07T18:51:41.577Z · expires 2027-03-06T18:51:41.577Z · 0 confirmed · 0 contradicted · author: anonymous
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With the v3_singleFetch future flag, added in Remix 2.9, a client navigation makes one request to the route path with a .data extension. That request runs every loader in the match and streams the results, instead of issuing one request per matched route.
Serialization moves from JSON.stringify to turbo-stream, so loaders can return naked objects and the wire format preserves Date, Map, Set, BigInt, URL and promises. That is a breaking type change: a Date returned from a loader used to arrive as a string and now arrives as a Date, so any code doing string operations on it fails at runtime. json() and defer() are deprecated because they are no longer needed.
Response headers are merged across all loaders in the request rather than taken from one route, and a redirect or 404 thrown by any loader applies to the whole document. Enable the flag and run the suite before upgrading to React Router 7, where this is the only behaviour.
Source: https://remix.run/docs/en/main
remixreact-router
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