Convert YAML config files to dotenv format with nested flattening and prefix customization
Zero Dependencies · Works OfflineThe YAML to .env Converter is a free online tool that transforms YAML configuration files into dotenv (.env) format with one click. It automatically flattens nested objects, converting database.host to DATABASE_HOST. Supports custom separators, key uppercase, prefix addition, and value quoting. Ideal for migrating from YAML configs to environment variables. All conversion runs locally in your browser with no server uploads.
1. Paste YAML configuration content in the input box, or click "Load Example" to try it out.
2. Configure options: separator, uppercase keys, prefix, value quoting as needed.
3. Click "Convert" to generate the .env content in the result area.
4. Click "Copy Result" to copy to clipboard, or "Download .env" to save as a file.
5. For Docker Compose format, click "Docker Format".
Migrate from YAML config files to environment variables with one click, avoiding manual variable creation.
Convert YAML configs to .env files for use with docker-compose, separating configuration from code.
Quickly generate environment variable lists from YAML for GitHub Actions or GitLab CI configuration.
Convert different environment YAML configs to separate .env files for easy switching between dev/staging/production.
Dotenv (.env files) is a popular configuration management approach popularized by the Node.js dotenv library. Its core principle is storing configuration in environment variables, following the twelve-factor app methodology. YAML is a human-readable data serialization format widely used in config files (Docker Compose, Kubernetes, CI/CD). When converting YAML to .env, nested objects must be flattened: typically by joining hierarchical keys with underscores and converting to uppercase to follow environment variable naming conventions. For example, database.connection.host becomes DATABASE_CONNECTION_HOST. Note that .env files should never be committed to version control — always add them to .gitignore.
Nested object flattening, array indexing, string/number/boolean types, comments, and multi-level nesting.
Automatically flattened with the chosen separator. database.host becomes DATABASE_HOST. Choose underscore or double-underscore and toggle uppercase.
No. Pure frontend technology — all conversion happens locally in your browser. Your data never leaves your device.
Yes. Enter a prefix (e.g., APP_) and all keys will be prefixed. database.host becomes APP_DATABASE_HOST.
Yes. Click "Docker Format" to generate YAML environment list format for docker-compose.yml.
Null values default to empty strings. Check "Skip nulls" to exclude null and empty values from output.