Child Process — Node.js Technical Interview Questions & Answers

Child Process

Child Process

  • Child Process is a Node.js topic. In plain words you use it for use all CPU cores in production box. Don’t start with a slogan — start with that picture.
  • Smallest example: cluster.fork or PM2. Type it, run it, and say what you see. If you can do that from memory, you know Child Process.
  • From the example next to this theory: Child Process: find user 2, then list names.
  • Trap: in-memory session without sticky. Fix that before you talk about advanced Node.js.
  • Viva: what is Child Process? Then show cluster.fork or PM2. Then name the trap.

Technical Interview Tip: What is Child Process? Show this: cluster.fork or PM2. Trap: in-memory session without sticky.

Code Examples for Child Process

Child Process — working example

// Child Process
const users = [
  { id: 1, name: "Asha" },
  { id: 2, name: "Ravi" },
];

function findUser(id) {
  return users.find((u) => u.id === id) ?? null;
}

console.log(findUser(2));
console.log(users.map((u) => u.name));

Child Process: find user 2, then list names. Say both prints.

How to Explain Child Process to an Interviewer

What is Child Process?

Used for use all CPU cores production box Not just the heading

Give one small example of Child Process.

cluster.fork or PM2 Child Process: find user 2, then list names

What mistake do beginners make with Child Process?

in-memory session without sticky Show the fix

Where do you use Child Process?

production box use all CPU cores