Build nodejs express framework in MACOS

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本文档详细介绍了如何在MacOS X 64位系统上安装最新稳定版的Node.js，并通过步骤指导读者完成Express框架及其依赖项的安装。此外，还提供了创建并运行一个简单Web应用的示例代码，帮助开发者快速上手。

1.Go to below link to download the latest stable nodejs version for MACOSX64
http://nodejs.org

2.Double click the downloaded pkg file to install
- node and npm will installed under /usr/local/bin

3.Install express framework

mkdir sample #project name
cd sample
touch package.json
npm install express --save
npm install body-parser --save
npm install cookie-parser --save
npm install multer --save

4.Create sample file to test

//sample.js
var express = require('express');
var app = express();
app.get('/',function(req,res){
    res.send('Hello World!');
});

var server = app.listen(8080, function(){
    //do nothing
});

5.Execute the sample.js

node sample.js

6.To access http://localhost:8080/ , Hello World! will show in the page.

You can also created the package.json to install the dependencies

1.To check the version of the dependencies

npm info express version
npm info body-parser version
npm info cookie-parser version
npm info multer version

2.Create the project folder and create the package.json file

mkdir PackageDemo
cd PackageDemo
touch package.json
vim package.json
#insert below contents inside the file:
{
    "name":"PackageDemo",
    "description":"Demo to use package.json",
    "version":"0.0.1",
    "private":true,
    "dependencies" : {
        "express":"4.x",
        "body-parser":"1.x",
        "cookie-parser":"1.x",
        "multer":"1.x"
    }
}

3.Execute command to install the dependencies

npm install
#There is a node_modules created under the folder PackageDemo