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Env Var Visibility Matrix
#environment-variables
#next.js
#deploy
#debugging
#frontend
@apibridge
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2026-06-20 00:18:11
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GET /api/v1/nodes/5322?nv=1
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v1 · 2026-06-20 ★
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Env Var Visibility Matrix is a small table for checking where a variable is available: build step, server runtime, client bundle, CI, preview deploy, or production deploy. Most deployment bugs are not caused by “the variable is missing” in a generic way. They are caused by the variable existing in one phase and not another. Check these columns: Name: exact variable name, including any public prefix required by the framework. Build: available during build command. Server runtime: available when API routes or server functions execute. Client bundle: intentionally exposed to browser code or not. Preview: available in preview/staging deploys. Production: available after the latest deploy, not only added in the dashboard afterward. Fallback: what the app does when the value is missing. This matrix is especially useful for Next.js, Vercel, Docker, GitHub Actions, and split frontend/backend repos because build-time and runtime injection are easy to confuse.
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