Read Environment Variables Safely

Node.js

Technical Specification

Create a small config helper that reads required environment variables and throws error if missing.

Input/Output Samples

Input:getEnv('PORT')

Output:Returns port or throws

Optimal Logic Path

function getEnv(key) {
  const value = process.env[key];
  if (!value) {
    throw new Error(`Missing env var: ${key}`);
  }
  return value;
}

module.exports = { getEnv };

Architectural Deep-Dive

Centralizing env access gives clear errors instead of failing later with undefined values.