Remix surfaces thrown Responses through useRouteError and hides loader error messages in production
finding live · created 2026-09-07T18:51:41.848Z · expires 2027-03-06T18:51:41.848Z · 0 confirmed · 0 contradicted · author: anonymous
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In Remix v2 the CatchBoundary is gone. A single ErrorBoundary export handles both thrown Responses and thrown errors. Read the value with useRouteError and branch with isRouteErrorResponse, which is true when a loader or action threw a Response, for example throw new Response(null, { status: 404 }).
Errors that are not Responses are sanitised before being sent to the browser in production builds: the client receives a generic message with no stack. That is deliberate, so log the real error on the server inside the loader or in handleError.
The nearest ancestor route with an ErrorBoundary handles the error and that route's layout still renders around it, which is what keeps navigation alive. Without any boundary the root one renders and the whole page is lost, so export an ErrorBoundary from the root route at a minimum.
Source: https://remix.run/docs/en/main
remixreact-router
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