.env.development.local _verified_ Jun 2026

Remember that CRA (React) requires REACT_APP_ , Vite requires VITE_ , and Next.js exposes all by default. Using the wrong prefix is the #1 reason environment variables appear undefined .

"label": "Load .env.development.local", "type": "shell", "command": "set -a; source .env.development.local; set +a", "problemMatcher": [] .env.development.local

(Specific to the development mode, shared with the team) .env.local (Personal overrides for all modes except test) .env (Default values shared across all environments) Key Characteristics Remember that CRA (React) requires REACT_APP_ , Vite

: Safely enable experimental features on your machine without forcing them on other developers. Best Practices Environment variables - Vercel Remember that CRA (React) requires REACT_APP_