EnvPro

A powerful and flexible .env file manager for Node.js applications with type conversion, comments support, and structured environment variable management.

Features

• 📝 Parse, read, update, and write .env files with ease
• 🔄 Automatic type conversion (strings, numbers, booleans, arrays, JSON objects)
• 💬 Support for comments (standalone and inline)
• 🔍 Smart detection of data types
• 🧩 Structured organization of variables with comments
• 🚀 Simple and intuitive API
• 🔒 Preserves file structure and formatting
• 🛠️ Built with TypeScript for type safety

📦 Installation

Using npm:

npm install env-pro

Using yarn:

yarn add env-pro

Using bun:

bun add env-pro

Quick Start

import { Env } from 'env-pro';

// Initialize env-pro (defaults to .env in current directory)
const env = Env();

// Add variables
env.add('PORT', '3000');
env.add('DEBUG', 'true');
env.add('API_URL', 'https://api.example.com');
env.add('ALLOWED_ORIGINS', 'http://localhost:3000,https://example.com');

// Read variables (with automatic type conversion)
const port = env.get('PORT');  // Returns number: 3000
const debug = env.get('DEBUG');  // Returns boolean: true
const origins = env.get('ALLOWED_ORIGINS');  // Returns array: ['http://localhost:3000', 'https://example.com']

// Update variables
env.update('PORT', '8080');

// Check if variable exists
if (env.has('DATABASE_URL')) {
  // Do something
}

// Delete variables
env.delete('TEMP_VAR');

// Clear all variables
env.clear();

// Save changes to file (done automatically by default)
env.save();

API Reference

Initialization

// Default options
const env = Env();

// Custom options
const env = Env({
  path: './config/.env.production',
  autoSave: true,
  createIfNotExist: true,
  defaults: {
    NODE_ENV: 'development',
    PORT: '3000'
  }
});

Options

| Option | Type | Default | Description | |--------|------|---------|-------------| | path | string | ./.env | Path to the .env file | | autoSave | boolean | true | Automatically save changes to file | | createIfNotExist | boolean | true | Create the file if it doesn't exist | | autoSync | boolean | false | Auto-sync with process.env | | defaults | object | {} | Default values to set when initializing |

Methods

Basic Operations

• add(name, value, comment?) - Add a new variable
• get(name) - Get a variable's value (with type conversion)
• update(name, value, comment?) - Update an existing variable
• delete(name) - Delete a variable
• has(name) - Check if a variable exists
• clear() - Clear all variables, comments, and empty lines

Comments

• addComment(comment) - Add a standalone comment
• getComment(name) - Get a comment for a variable
• updateComment(lineNum, comment) - Update a comment
• deleteComment(lineNum) - Delete a comment
• getAllComments() - Get all comments

Empty Lines

• addEmpty() - Add an empty line
• deleteEmpty(lineNum) - Delete an empty line

File Operations

• save() - Save changes to file
• parse() - Parse the .env file
• getAll() - Get all items (variables, comments, empty lines)
• reindex() - Reindex all items

Input Formats

env-pro supports multiple input formats for adding variables:

// Simple key-value
env.add('PORT', '3000');

// Key-value with comment
env.add('PORT', '3000', 'Server port');

// Array format
env.add(['PORT', '3000']);
env.add(['PORT', '3000', 'Server port']);

// Object format
env.add({ name: 'PORT', value: '3000' });
env.add({ name: 'PORT', value: '3000', comment: 'Server port' });

// Raw line (advanced)
env.add('PORT=3000 # Server port');

Type Conversion

env-pro automatically converts values to appropriate types:

| Input | Converted Value | |-------|-----------------| | '3000' | 3000 (number) | | '3.14' | 3.14 (number) | | 'true', 'yes', 'on' | true (boolean) | | 'false', 'no', 'off' | false (boolean) | | 'item1,item2,item3' | ['item1', 'item2', 'item3'] (array) | | '{"key":"value"}' | {key: 'value'} (object) | | '[1,2,3]' | [1, 2, 3] (array) |

Examples

Web Server Configuration

// Load .env file
const env = Env();

// Create a server config
const serverConfig = {
  port: env.get('PORT') || 3000,
  host: env.get('HOST') || 'localhost',
  env: env.get('NODE_ENV') || 'development',
  corsOrigin: env.get('CORS_ORIGIN') || '*'
};

// Use in Express.js
const app = express();
app.listen(serverConfig.port, serverConfig.host, () => {
  console.log(`Server running at http://${serverConfig.host}:${serverConfig.port}`);
});

Database Configuration

// Load .env file
const env = Env();

// Create database config
const dbConfig = {
  host: env.get('DB_HOST'),
  port: env.get('DB_PORT'),
  user: env.get('DB_USER'),
  password: env.get('DB_PASS'),
  database: env.get('DB_NAME'),
  ssl: env.get('DB_SSL'),
  pool: {
    min: env.get('DB_POOL_MIN'),
    max: env.get('DB_POOL_MAX')
  }
};

// Connect to database
const db = createConnection(dbConfig);

Feature Flags

// Load .env file
const env = Env();

// Configure feature flags
const features = {
  newUI: env.get('ENABLE_NEW_UI'),
  analytics: env.get('ENABLE_ANALYTICS'),
  notifications: env.get('ENABLE_NOTIFICATIONS')
};

// Use in application
if (features.newUI) {
  app.use(newUIMiddleware());
}

Advanced Usage

Working with Comments

// Add a section comment
env.add('# API Configuration');

// Add variable with inline comment
env.add('API_URL', 'https://api.example.com', 'Production API endpoint');

// Add an empty line for readability
env.addEmpty();

// Add another section
env.add('# Database Configuration');
env.add('DB_HOST', 'localhost');

Structured Configuration

// Define sections
const sections = [
  {
    title: 'Server Configuration',
    variables: [
      { name: 'PORT', value: '3000', comment: 'Server port' },
      { name: 'HOST', value: 'localhost' },
      { name: 'NODE_ENV', value: 'development' }
    ]
  },
  {
    title: 'Database Configuration',
    variables: [
      { name: 'DB_HOST', value: 'localhost' },
      { name: 'DB_PORT', value: '5432' },
      { name: 'DB_USER', value: 'postgres' }
    ]
  }
];

// Clear existing config
env.clear();

// Add sections
sections.forEach(section => {
  env.add(`# ${section.title}`);
  section.variables.forEach(variable => {
    env.add(variable.name, variable.value, variable.comment);
  });
  env.addEmpty(); // Add empty line between sections
});

🤝 Contriuting

Contributions are welcome! soon.

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.