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How do I create and use custom modules in a Node.js application?

const [moduleName] = require('./[moduleName]');

In order to create and use custom modules in a Node.js application, you must first require the module using the require() function. This is done by assigning the module to a variable, like so: 

const [moduleName] = require('./[moduleName]');
This will allow you to access the module's functions and variables from within your application. For example, if you have a custom module called myModule, you can access its functions and variables like this: 
const myModule = require('./myModule'); myModule.someFunction(); myModule.someVariable;
By requiring the module, you can now use its functions and variables in your application. To learn more about creating and using custom modules in Node.js applications, check out this tutorial.

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