Processing an algorithm as a sequence of nested callbacks is not clever.

TL;DR: Don't process calls in a callback way. Write a sequence.

Problems

• Readability

• Hard to debug.

• Complexity

Solutions

1. Change callbacks to sequence calls.

2. Extract repeated Code

3. Refactor.

Sample Code

Wrong

var fs = require('fs');

var fileWithData = '/hello.world';  
fs.readFile(fileWithData, 'utf8',