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What is YAML to ENV Converter?
YAML (YAML Ain't Markup Language) is a human-readable configuration format using indentation and key: value syntax. .env files store environment variables in flat KEY=VALUE format, commonly used by Node.js (dotenv), Python, Docker, and many other frameworks. This converter flattens nested YAML structures into .env format, joining nested keys with configurable separators and applying case conversion for standard environment variable naming.
How to Use
- Paste your YAML content in the input area on the left
- Configure options: key separator, case, array handling, and quoting
- Click 'Convert' to flatten the YAML into .env format
- Review the generated KEY=VALUE pairs in the output area
- Copy the result to your .env file
Why Use This Tool?
Tips & Best Practices
- Uppercase with underscore separator is the .env convention
- Use double underscore separator when keys contain underscores
- Indexed keys work better when array order matters
- Quote all values for maximum compatibility with .env parsers
- Comments in YAML (#) are automatically stripped from output
- Values with spaces or special characters are auto-quoted
Frequently Asked Questions
Why convert YAML to .env format?
Many applications use .env files for environment variables (Node.js, Python, Docker). YAML configs are human-friendly but .env is the standard for environment variable injection. Converting YAML configs to .env lets you use the same configuration across different deployment tools and frameworks.
How are nested YAML keys handled?
Nested keys are flattened by joining them with a separator. For example, database.host with underscore separator becomes DATABASE_HOST. With dot separator it becomes database.host. This preserves the hierarchy while creating flat KEY=VALUE pairs that .env files require.
Is my data secure?
Yes. All processing happens entirely in your browser. Your YAML content is never sent to any server. No data is collected, stored, or transmitted. You can safely convert configs containing sensitive values like API keys and database passwords.
How are YAML arrays handled?
Arrays can be handled in two ways: comma-separated values (FEATURES=authentication,logging,metrics) or indexed keys (FEATURES_0=authentication, FEATURES_1=logging, FEATURES_2=metrics). Choose the option that best fits your application's needs.
What separator options are available?
You can choose between underscore (_), double underscore (__), or dot (.) as the key separator. Underscore is the most common for environment variables. Double underscore is useful when keys themselves contain underscores. Dot separator creates namespace-style keys like database.host.
Can I convert .env back to YAML?
Not with this tool, but you can use our Dotenv to YAML converter for the reverse operation. That tool parses .env KEY=VALUE pairs and reconstructs nested YAML structure based on key separators.