What is a .env file?
A .env file stores environment variables and configuration values used by an application.
Developer
Dotenv Validator
Validate .env files, environment variables and configuration syntax directly in your browser.
Tool
Dotenv Validator
Validate .env files, environment variables and configuration syntax directly in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free dotenv validator to verify .env files, detect formatting errors and review environment variable definitions before deployment.
Examples
- NODE_ENV=production
- DATABASE_URL=postgres://localhost/app
- API_KEY=sk-example-key
Frequently Asked Questions
Why validate a .env file?
Validation helps identify syntax issues, duplicate keys and formatting mistakes.
Can secrets be validated locally?
Yes. Validation can run entirely in the browser without uploading sensitive data.