: It helps DevOps teams understand which environment variables need to be configured in the production or staging pipelines. Best Practices for Your Sample File To make your .env.sample truly useful, follow these industry standards: Use Descriptive Placeholders : Instead of leaving values blank, use hints. SECRET_KEY= SECRET_KEY=your_secret_key_here Add Comments and Links
New developers spend hours figuring out why the application isn't starting, only to find they are missing a specific API key.
New developers often make the mistake of committing their actual .env file to GitHub. By providing a .env.sample , you establish a workflow: Copy .env.sample to a new file named .env . Fill in the real credentials. Keep the secrets local. 3. It Standardizes Environments
Modern software development relies heavily on configuration. Applications need to know which database to connect to, which API keys to use, and which port to listen on. Storing these sensitive details directly in your source code is a major security risk. .env.sample
It is a template file that mirrors the structure of your .env file but contains placeholder values instead of real secrets. It is checked into version control to show other developers exactly which variables they need to define to get the project running. Why Use a .env.sample ? 1. Frictionless Onboarding
# Environment variables (real secrets, DO NOT COMMIT) .env .env.local .env.*.local .env.production .env.staging
Ensure that your actual secret-filled file ( .env ) is not committed. Add it to your .gitignore : # .gitignore .env .env.local .env.*.local node_modules/ Use code with caution. Step 4: Instruct Team Members : It helps DevOps teams understand which environment
Manually adding, removing, or updating variables in both files is tedious and error-prone. Here are some excellent tools to automate the process:
Then tooling (e.g., dotenv-validator ) checks .env against the sample.
The worst sin: adding a new environment variable to the code (e.g., REDIS_URL ) but forgetting to add it to .env.sample . The new developer will crash with a cryptic error: KeyError: 'REDIS_URL' . Enforce a policy: "No new env var is merged unless the .env.sample is updated." Use a linter like dotenv-linter in CI. New developers often make the mistake of committing
An .env.sample file (often also named .env.example ) is a used to show other developers which environment variables your project needs without exposing actual sensitive data like passwords or API keys. Standard Template Structure
# =========================================== # DATABASE CONFIGURATION # ===========================================
# API keys API_KEY=YOUR_API_KEY_HERE API_SECRET=YOUR_API_SECRET_HERE
The format is simple:
.env.sample .env.example ) file is a template used in software development to document the environment variables required for an application to run without exposing sensitive secrets. Key Purpose & Features Documentation Template