.env File Diff & Validator

Compare environment files, find missing variables, and validate your configuration. All processing happens securely in your browser.

Compare .env FilesLearn More

Validate Your Environment Files

Paste your .env files to compare them side-by-side and identify missing or mismatched variables across environments.

Source (.env.example / .env.local)
Target (.env.production / .env)

Common Use Cases

Environment Parity

Ensure your development, staging, and production environments have consistent variable names and avoid deployment issues caused by missing configuration.

Onboarding New Developers

Compare example .env files with deployed versions to help new team members set up their local environment with all required variables.

Migration & Updates

When adding new environment variables, validate that all environments have been updated before deploying to prevent runtime errors.

Security Audits

Review and compare environment configurations to ensure sensitive variables are properly set and no test data leaks into production.

Frequently Asked Questions

Common questions about .env file validation

What is a .env file?

A .env file stores environment variables for your application. It typically contains configuration settings like API keys, database URLs, and feature flags that vary between development, staging, and production environments.

Is it safe to validate .env files in my browser?

Yes, all validation and comparison happens entirely in your browser using JavaScript. Your .env files never leave your device or get sent to any server, ensuring your sensitive configuration remains private.

How do I compare .env files?

Paste your production and development .env files into the comparison tool. It will highlight missing variables, show differences, and help you identify configuration inconsistencies between environments.

Can this tool fix my .env file?

The tool identifies differences and missing variables but doesn't automatically modify files. Use the comparison results to manually update your environment files with the correct values.