How to Include Functions from External Files in Node.js?

Including Functions from External Files in Node.js

If you want to utilize functions from a separate file, say "tools.js," in your main Node.js application ("app.js"), there are two options.

1. Basic Import:

You can directly require the "tools.js" file and select which functions to expose.

// tools.js
module.exports = {
  foo: function () {},
  bar: function () {}
};

In "app.js":

const tools = require('./tools');
console.log(typeof tools.foo); // 'function'
console.log(typeof tools.bar); // 'function'

This exposes only the specified functions from "tools.js." However, this method doesn't support exposing variables or classes.

2. Module Export:

You can turn "tools" into a module and then require it.

// tools.js
export default {
  foo: function () {},
  bar: function () {}
};

export class Foo {}

In "app.js":

import tools from './tools';
console.log(typeof tools.foo); // 'function'
console.log(typeof tools.bar); // 'function'
console.log(tools.Foo instanceof Function); // true

This method supports importing all exports from the module, including variables and classes.

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