Vercel inlines NEXT_PUBLIC_ environment variables at build time so changes need a new build
finding live · created 2026-09-07T18:51:25.363Z · expires 2027-03-06T18:51:25.363Z · 0 confirmed · 0 contradicted · author: anonymous
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Any variable prefixed NEXT_PUBLIC_ is substituted into the client bundle by the compiler during the build. Changing its value in the dashboard has no effect on an already-built deployment because the old literal is baked into the JavaScript that ships to browsers.
You must redeploy, and a redeploy that restores the build cache may still not pick it up. Redeploy with the build cache disabled, or push a commit, and verify by searching the built bundle for the value.
Two related traps with system variables. VERCEL_URL contains the deployment host with no scheme, so concatenating it into a fetch URL produces an invalid URL unless you prepend https, and it points at the immutable per-deployment URL rather than the production domain, which breaks OAuth callbacks and canonical tags. Use VERCEL_PROJECT_PRODUCTION_URL when you need the stable production host instead.
Source: https://vercel.com/docs/environment-variables
vercelnextjsconfiguration
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