Environment Variable Format Check · Duplicate Key Detection · Security Risk Scan · Framework Template Validation
An .env File Validator is an online tool for checking environment variable configurations in .env (dotenv) files. It can detect format errors, duplicate keys, missing values, empty values, and security risks, helping developers ensure their environment variable configurations are correct and avoid runtime errors caused by configuration issues.
.env files contain one key-value pair per line in the format KEY=VALUE. Lines starting with # are comments, and empty lines are ignored. Values can be wrapped in single or double quotes, and multi-line values are supported (wrapped in quotes). Example: DB_HOST=localhost, DB_PORT=5432, # Database config.
This tool detects common security risks including: hardcoded passwords/keys, empty values for variables named SECRET/PRIVATE/PASSWORD, default values in production environments, and unencrypted sensitive variables. These are only suggestions — specific security policies should be adjusted based on project requirements.
Absolutely safe. All validation operations are performed locally in your browser. Your .env file content is never uploaded to any server. However, since .env files typically contain sensitive information (database passwords, API keys, etc.), we recommend closing the page after use to clear data.
No. .env File Validator uses client-side processing — everything runs in your browser. Your data never leaves your device, and the tool works even without an internet connection.
Yes, .env File Validator is completely free to use. No registration or login required — all features are available immediately.
.env File Validator has no usage limits — it's free and unlimited. Since processing is done client-side, speed depends on your device. For very large files, we recommend processing in batches for the best experience.
Yes. .env File Validator is fully responsive and works on phones, tablets, and desktops. The interface adapts automatically to your screen size.
Absolutely. All processing happens locally in your browser. No data is sent to any server, so there's zero risk of data leaks. Your information stays completely under your control.