.env File Validator
Validate .env file format, detect duplicate keys, missing values, and syntax issues. Free online dotenv file checker and linter.
About .env Validator
Validates your .env (environment variable) files for common issues including duplicate keys, empty values, missing quotes around values with spaces, invalid key names, inline comments that some parsers don't support, and more. All validation happens in your browser - your sensitive environment variables never leave your device.
How to Use .env File Validator
Open .env File Validator
Navigate to .env File Validator in your browser — no installation or sign-up required.
Enter your data
Type, paste, or upload the content you want to process into the input area.
Configure options
Adjust any available settings to customize the output to your needs.
Get your result
The result appears instantly. Copy it to your clipboard or download it as a file.
Frequently Asked Questions
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