How to Include External Functions in Your Node.js Application?

Including Functions from External Files in Node.js

In Node.js, you may require the need to include functions from other files in your application. This is a common scenario when organizing your code into modules or libraries. Here's a guide on how to achieve this:

Let's assume you have a file named tools.js containing functions you want to include in your app.js file. To import them:

Step 1: Expose Functions in tools.js

In tools.js, create a module that exports the functions you want to use in app.js:

// tools.js

module.exports = {
  foo: function () {
    // Some implementation
  },
  bar: function () {
    // Some implementation
  },
};

In this example, we've exposed two functions, foo() and bar(), from the tools module.

Step 2: Require the Module in app.js

In your main application file, app.js, you can import the functions from tools.js:

// app.js

// Import the tools module
const tools = require('./tools');

// Call the exposed functions
console.log(typeof tools.foo); // Will log 'function'
console.log(typeof tools.bar); // Will log 'function'

// If you didn't expose a function, it will be undefined:
console.log(typeof tools.baz); // Will log 'undefined'

By following these steps, you can easily include functions from other files in your Node.js application. This approach allows you to organize your code and reuse functions across multiple files.

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