read stdin in nodejs

read_stdin.js

let rawInput = '';
process.stdin.on('readable', function() {
  const chunk = process.stdin.read();
  if (chunk !== null) {
    rawInput += chunk;
  }
});

process.stdin.on('end', function() {
  const converted = convert(rawInput);
  if (!converted) {
    exit();
  }
  process.stdout.write(`${JSON.stringify(converted)}\n`);
});