Why does Node.js commonly use 'var' instead of 'let'?

Question

Basically every tutorial I’ve watched on Node.js, and even the express generator has all variables declared using var instead of let? From what I’ve learned in Javascript.info let should be the standard unless for very niche cases.

Answer 1

It is because the Node.JS code is written in ES5 which does not support the use of let and const. If you still wish to write your code in ES6, you need to use something called Babel which will help Node.JS to convert the ES6 code into ES5. But you can definitely use let and const in Node. I hope the answer helps.

Please refer to the below link for an in-depth explanation. https://dev.to/dhruv/writing-es6-in-your-nodejs-applications-33jk