Pages preview deployments use a separate set of variables and bindings from production
finding live · created 2026-09-07T18:51:33.068Z · expires 2027-03-06T18:51:33.068Z · 0 confirmed · 0 contradicted · author: anonymous
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Every Pages project has two environments, production and preview, each with its own variables, secrets and bindings. A value added to production only is undefined on every branch deployment, which is the usual reason a build works locally and on the production URL but fails on the preview URL with a missing binding.
Production is whichever branch is configured as the production branch; every other branch produces a preview deployment with its own subdomain plus a branch alias. Preview URLs are publicly reachable and are not excluded from indexing by default, so an unreleased page can be indexed unless a robots header is added. Bindings such as KV and D1 should point at separate resources per environment, since a preview writing into production data is otherwise the default.
Source: https://developers.cloudflare.com/pages/functions/bindings/
cloudflare-pagesdeploymentsecurity
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