Configuration

Best practices and patterns for using JSON in configuration files. Learn how to structure, validate, and secure your app configs.

Why Use JSON for Configuration?

Readability: Easy to read and understand
Structure: Hierarchical data organization
Validation: Can be validated against schemas
Support: Native support in most languages
Tooling: Rich ecosystem of tools and editors

Common Configuration Patterns

1. Environment-based Configuration

{
  "environment": "development",
  "debug": true,
  "logLevel": "debug"
}

2. Feature Flags

{
  "features": {
    "enableNotifications": true,
    "enableAnalytics": false,
    "maintenanceMode": false
  }
}

3. Service Configuration

{
  "server": {
    "host": "localhost",
    "port": 3000,
    "timeout": 30000
  }
}

Best Practices

Use Comments: Add comments to explain complex settings
Group Related Settings: Organize settings logically
Use Defaults: Provide sensible default values
Environment Separation: Keep different environments in separate files
Validation: Use JSON Schema to validate configurations
Security: Never store sensitive data in JSON configs

Example: Application Configuration

Here's a comprehensive example of an application configuration:

{
  "app": {
    "name": "MyApp",
    "version": "1.0.0",
    "environment": "production"
  },
  "server": {
    "host": "0.0.0.0",
    "port": 3000
  },
  "database": {
    "type": "postgresql",
    "host": "localhost",
    "port": 5432
  }
}

Environment-specific Configurations

It's common to have different configurations for different environments:

config.json - Base configuration
config.dev.json - Development settings
config.prod.json - Production settings
config.test.json - Testing settings

Security Considerations

Never store secrets in JSON config files
Use environment variables for sensitive data
Consider using a secrets management service
Validate configuration values at startup
Use different configs for different environments

Try It Yourself

Check out our example configuration files: