.env.local Jun 2026

You are on a plane without internet. Your app usually calls a live API via API_URL=https://api.example.com . You drop API_URL=http://localhost:4000 into .env.local to point at a local mock server. Your teammates' configs remain unchanged.

Have a question about .env.local that wasn't covered? The pattern continues to evolve across frameworks, but the core principle remains unchanged: separate your configuration from your code, and keep your secrets out of version control. .env.local

Avoid these frequent missteps when working with .env.local : You are on a plane without internet

Vite uses .env.local similarly, with one crucial difference: variable prefix. with one crucial difference: variable prefix.