Developer
Dotenv Validator
Validate .env files, environment variables and configuration syntax directly in your browser.
Tool
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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
What is a .env file?
A .env file stores environment variables and configuration values used by an application.
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.