Popular frameworks have built-in "loading orders." For instance, in , the hierarchy looks like this: .env.local (Highest priority) .env.development / .env.production .env (Lowest priority)
When a new teammate joins, they simply run cp .env.example .env.local and fill in their own credentials. .env.local
Forgetting to add NEXT_PUBLIC_ or VITE_ can lead to frustrating "undefined" errors when trying to access variables in your React/Vue components. Popular frameworks have built-in "loading orders
The best practice is to create a file. This file contains the keys but not the actual values. Example .env.example : STRIPE_SECRET_KEY= NEXT_PUBLIC_ANALYTICS_ID= DATABASE_URL= Use code with caution. This file contains the keys but not the actual values
The biggest risk in modern web development is "credential leakage." If you put your Stripe Secret Key in a standard .env file and commit it to a public repository, bots will find it within seconds. Because .env.local is kept strictly on your machine, that risk is eliminated.
Since .env.local isn't shared with your team via Git, how do new developers know which variables they need to set up?
While it looks like a simple text file, it plays a critical role in keeping your application secure and your development workflow smooth.