Express builds a simple local background (1)

List of articles

Tips ： This article will explain how to build a simple background program , Write a get Interface of type .

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Preface

Tops：1. When talking about problems with the backend partners today , I thought of building a simple local server .

2. I have studied before Node The server , I can't remember when I suddenly want to build a server , What is the specific process , Just write this article ！！！！！！！！

3. It is convenient for me to review when I need it in the future ！！！！！！

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Tips ： Follow up Node backstage Api It will also be constantly updated ！！！！！！！

One 、express What is it? ？

Express It's based on Node.js Minimalism of the platform 、 agile web Application development framework , It provides a powerful set of features , Help you create a variety of Web And mobile applications .
tips: For front-end developers , It can satisfy us to build local servers , Don't study java You can operate the database . Make front-end students know more about the work of back-end students

Two 、express Steps to set up the server

1. Initialization and installation

// Execute the following command： Initialization file  
// If you don't need to add the details of the project , Just go all the way back 
npm init 

The initialization is shown in the figure below ：

// install express（ Add... According to your own needs  -S  It's fine too   Add  -D）
 npm i express  

install express Here's the picture

2. Use express The construction steps are as follows ：

The code is as follows ：

//1. Import... In a file express
var express =require('express')

//2. Register an instance app
var app =express()

//3. Register a listening interface 
app.listen(3000,()=>{
    
    console.log("Server is strat !!!!!!");
})

The steps are as follows ：

3、 ... and . Browser test results

1. There is no return result of the default interface

2. Added default interface results

Interface codeding Here's the picture ：

// Write a get Requested interface 

app.get('/',(req,res)=>{
    
   res.json(`1231313`)
})

Browser result graph