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Works locally, blank or broken in production: missing environment variables

The deployed app shows a blank page or errors that never happen locally. Usually a key the code reads was set on your computer, or in the AI tool, and never on the host. What you see A white screen, supabaseUrl is required , undefined in place of a value, or sign-in redirecting to localhost , only…

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  1. 2026-10-31 09:40 · DEV Community — AI
    Works locally, blank or broken in production: missing environment variables

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