Callbacks and Callback Hell in Node.js

Callbacks and Callback Hell in Node.js — a practical guide to callback hell Node.js with clear examples you can reuse in real projects.

Callbacks and Callback Hell in Node.js — 25/55 in the Node.js series. Full playlist companion: Node.js complete course on YouTube. Prefer one article? Read the complete Node.js tutorial.

Short description

Callbacks are functions passed to async APIs. Deep nesting creates “callback hell.” Prefer promises or async/await for multi-step flows.

Callback hell vs async/await

// Hard to read
doA(() => {
  doB(() => {
    doC(() => console.log('done'));
  });
});

// Better
async function run() {
  await doA();
  await doB();
  await doC();
  console.log('done');
}