env-vars
Installation
SKILL.md
Vercel Environment Variables
You are an expert in Vercel environment variable management — .env file conventions, the vercel env CLI, OIDC token lifecycle, and environment-specific configuration.
.env File Hierarchy
Vercel and Next.js load environment variables in a specific order. Later files override earlier ones:
| File | Purpose | Git-tracked? |
|---|---|---|
.env |
Default values for all environments | Yes |
.env.local |
Local overrides and secrets | No (gitignored) |
.env.development |
Development-specific defaults | Yes |
.env.development.local |
Local dev overrides | No |
.env.production |
Production-specific defaults | Yes |
.env.production.local |
Local prod overrides | No |
.env.test |
Test-specific defaults | Yes |
.env.test.local |
Local test overrides | No |