One

concept

Nodejs in addition to its core module provides external module may also use custom third-party modules
Nodejs by a third-party modules package composition can be carried out on a set of modules by coating with interdependence unified management

You can https://www.npmjs.comfind packages
in modules similar to Python

Simple to use

Download package:

npm i 包名
(Or npm install 包名)
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Can be used directly by require ()

var http=require("http");

var sd = require('silly-datetime');

var app=http.createServer(function(req,resp){
    
    resp.writeHead(200,{"Content-Type":"text/html;charset=utf-8"});
    
    var d=sd.format(new Date(), 'YYYY-MM-DD HH:mm');
    resp.write(d);
    
    resp.end();
});

app.listen(8001,"127.0.0.1");

success:
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Second, npm

concept

npm is the world's largest open source ecosystem through a wide variety of package npm download
the source code (package) can https://www.npmjs.comfind

npm is a package management tool installed with NodeJS and can solve many problems in NodeJS code deployment

Common usage scenarios:

Allow users to download third-party packages written by others from the NPM server for local use
Allow users to download and install command-line programs (tools) written by others from the NPM server for local use (such as supervisor)
Allow users to upload their own packages or command line programs to the NPM server for others to use