JSON to ENV Converter
Convert JSON objects to environment variable (.env) format. Flattens nested objects, handles arrays, and generates clean ENV files ready for deployment. Perfect for configuration management, Docker environments, and application settings.
Conversion Options
Convert all keys to UPPERCASE
Use KEY_0, KEY_1 format
Exclude null and undefined values
Quote only when necessary
Add # comments above keys
Flatten nested objects with underscores
Recommended Settings
ENV File Best Practices
- •Use UPPERCASE_WITH_UNDERSCORES for environment variable names (standard convention)
- •Never commit .env files with sensitive data to version control - use .env.example instead
- •Group related variables with common prefixes (DATABASE_, API_, CACHE_) for organization
- •Quote values that contain spaces, special characters, or start/end with whitespace
- •Keep .env files simple - avoid deeply nested structures, flatten when possible
Common Use Cases
- •Docker & Docker Compose: Convert JSON config to .env for container environments
- •Cloud deployments: Generate ENV files for Heroku, AWS, Azure, or Google Cloud
- •CI/CD pipelines: Create environment-specific configs from JSON templates
- •Application settings: Store database connections, API keys, feature flags as ENV vars
- •12-factor apps: Follow twelve-factor methodology by storing config in environment
Pro Tips
- •Paste JSON and it auto-validates - conversion happens automatically when valid
- •Nested objects flatten with underscores: database.host becomes DATABASE_HOST
- •Arrays convert to indexed keys: hosts[0] becomes HOSTS_0, hosts[1] becomes HOSTS_1
- •All processing happens in your browser - your data never leaves your device
Most Popular
Most users enable uppercase keys, flatten nested objects, and use index-based arrays
When to Use This Tool
Convert JSON configuration to .env files for Docker containers and Docker Compose. ENV files are the standard way to pass configuration to containerized applications. Flatten your JSON config to environment variables that can be easily mounted or injected into containers.
Generate ENV files for cloud platforms like Heroku, AWS Elastic Beanstalk, Azure App Service, or Google Cloud Run. These platforms use environment variables for application configuration. Convert your JSON settings to the ENV format required by cloud providers.
Create environment-specific configurations from JSON templates in your CI/CD workflows. Generate .env files for development, staging, and production environments. Automate config generation as part of your deployment pipeline using JSON sources.
Store application settings as environment variables following the twelve-factor app methodology. Convert JSON configs containing database connections, API endpoints, feature flags, and secrets to ENV format for secure configuration management.
How It Works
Paste your JSON configuration object into the input field on the left side
The tool automatically validates JSON syntax to ensure proper formatting
Click 'Convert to ENV' or paste valid JSON to trigger automatic conversion
JSON is recursively flattened - nested objects become underscore-separated keys
Arrays are converted to indexed keys (KEY_0, KEY_1) or comma-separated values
Keys are converted to UPPERCASE following ENV naming conventions
Values are intelligently quoted when they contain spaces or special characters
Copy the ENV output to clipboard or download as .env file
All processing happens in your browser - your JSON never leaves your device
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Files never leave your device. All processing happens locally in your browser.
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Frequently Asked Questions
What is an ENV file?
An ENV file (.env) is a plain text file that stores environment variables in KEY=value format. It's commonly used to configure applications without hardcoding settings in source code. ENV files follow the twelve-factor app methodology for separating config from code.
How are nested JSON objects converted to ENV format?
Nested objects are flattened using underscores to join key paths. For example, {"database": {"host": "localhost", "port": 5432}} becomes DATABASE_HOST=localhost and DATABASE_PORT=5432. This creates a flat structure compatible with ENV files.
How are arrays handled in the conversion?
By default, arrays use index-based keys. For example, {"hosts": ["localhost", "example.com"]} becomes HOSTS_0=localhost and HOSTS_1=example.com. You can disable "Index-based Arrays" to use comma-separated values instead (HOSTS=localhost,example.com).
When should I quote environment variable values?
Enable "Smart Quoting" (default) to automatically quote values with spaces, special characters, or leading/trailing whitespace. For example, DATABASE_NAME="My Database" gets quoted, but DATABASE_HOST=localhost does not. This ensures proper parsing by ENV file readers.
What happens to null and undefined values?
By default, null and undefined values are skipped (excluded from output). Disable "Skip Null/Undefined" to include them - null becomes KEY=null and undefined becomes KEY= (empty value). Most applications handle missing ENV vars gracefully.
Should ENV variable names be uppercase?
Yes, uppercase is the standard convention for environment variables across all operating systems and platforms. Enable "Uppercase Keys" (default) to follow this convention. While lowercase works technically, uppercase improves readability and follows industry best practices.
Can I convert ENV files back to JSON?
Yes! Use our ENV to JSON converter tool to reverse the conversion. However, note that flattening loses the original nested structure. The reverse conversion creates a flat JSON object unless you manually reconstruct nesting from key patterns.
Is it safe to use this tool with sensitive data?
Your data is private - all conversion happens entirely in your browser using JavaScript. Nothing is sent to any server. However, remember that ENV files often contain secrets (API keys, passwords). Never commit .env files to version control - use .env.example templates instead.