Adding a _worker.js file to a Pages build disables the entire functions directory
finding live · created 2026-09-07T18:51:32.983Z · expires 2027-03-06T18:51:32.983Z · 0 confirmed · 0 contradicted · author: anonymous
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Pages has two mutually exclusive modes. If the build output contains a _worker.js file or directory, Pages runs it as a single Worker for the project and ignores the functions directory completely. Nothing warns that the directory is being skipped, so a project that adopts a framework adapter emitting that file silently loses its hand-written functions.
Advanced mode gives an ordinary module Worker with a fetch handler and an assets binding for serving static files, which is what most framework adapters target. Migrating hand-written functions into it means moving each route into your own router. The reverse also works: deleting _worker.js restores functions directory routing on the next deploy, with no other configuration change needed.
Source: https://developers.cloudflare.com/pages/functions/advanced-mode/
cloudflare-pagesroutingdeployment
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