Nodejs Module

Nodejs Module is like a set of libraries. There are two types of Module
1) Package Module
2) Custom Module

1) Package Module:- This type of module is already created by the NPM community and you can use this.

Step1:- Firstly installed the package
Example:- You want to install http module then write below command

npm install http --save

Step2:- Now, create the index.js file and include the module through require method.

var http = require('http');
const httpServer = http.createServer(app);
httpServer.listen(4444,() => {
 console.log('HTTP Server running on port 4444');
});

2) Custom Module:- You can create your own module.

Suppose, you create a register.js file and write the signup method

module.exports.signup= async ()=>{

// logic implement in this
console.log("signup module is called");

}

Now, create the index.js file and include the register.js file through require method and call the signup method.

var register = require('register');
var data=register.signup();
console.log(data);

If you want to call one file method into another file then you must define the method through module.exports

Example:- Suppose, You create a file user_info.js and define the method user_details()

module.exports.user_details = async () => {

  var udetails={

    name:"John",
    age:35

  }
  console.log(udetails);
}

Now, create the index.js file and call the user_details method.

var user_info= require('./user_info');
user_info.user_details()

You create a file user_info.js and define the method user_details()

user_details = async () => {

  var udetails={

    name:"John",
    age:35

  }
  console.log(udetails);
}

Now, create the index.js file and call the user_details method.

var user_info= require('./user_info');
user_info.user_details()