Parse CLI Arguments into an Object

Node.js

Technical Specification

Build a simple command-line arguments parser that supports flags like --port=3000 --mode=dev.

Input/Output Samples

Input:node app.js --port=3000 --mode=dev

Output:{ port: '3000', mode: 'dev' }

Optimal Logic Path

function parseArgs(argv) {
  const args = {};
  for (const item of argv.slice(2)) {
    if (!item.startsWith("--")) continue;
    const [key, value] = item.slice(2).split("=");
    args[key] = value ?? true;
  }
  return args;
}

console.log(parseArgs(process.argv));

Architectural Deep-Dive

We manually parse arguments into a dictionary allowing simple config for CLI apps.