const convict = require('convict');
const convict_format_with_validator = require('convict-format-with-validator');

// Add all formats
convict.addFormats(convict_format_with_validator);

// Or add only specific formats:
// convict.addFormat(convict_format_with_validator.ipaddress);
// etc.

// Define a schema
var config = convict({
  ip: {
    doc: 'The IP address to bind.',
    format: 'ipaddress',
    default: '127.0.0.1',
    env: 'IP_ADDRESS',
  },
  port: {
    doc: 'The port to bind.',
    format: 'port',
    default: 8080,
    env: 'PORT',
    arg: 'port'
  }
});