Fix: a setting shows as "undefined" in the browser of your Next.js app (NEXT_PUBLIC_ environment variable, tested repro, Next 16 + React 19.3)
This story is from 2026-10-24. It is preserved in the archive; the latest stories are on the live feed.
A setting such as a booking link works on the server but shows up as undefined in the browser, with no error message and a passing build. In an AI-built (or hand-built) Next.js app, the usual causes are a variable name without the NEXT_PUBLIC_ prefix, or a variable added after the app was built. We…
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- 2026-10-24 13:32 · DEV Community — AI
Fix: a setting shows as "undefined" in the browser of your Next.js app (NEXT_PUBLIC_ environment variable, tested repro, Next 16 + React 19.3)