Nodejs in Visual Studio Code 03. Learn Express

1. Start

Download Source: Https://github.com/sayar/NodeMVA

Express components: NPM install EXPRESS-G (global installation)

2.ExpressRest

Open Directory 08_expressrest

App.js

var express = require (' Express '); var app = Express ();
Capturing the Get method and processing it returns a JSON that is much simpler than C # writing JSON app.get ('/', function (req, res) {    Res.json ({message: ' hooray! Welcome to our Api! '});
Listen for 8080 port app.listen (Process.env.PORT | | 8080);

Now the project is used Html/js, write a few lines of code to fix JSON restful, also with Web server, feel refreshed!

Open cmd to get the project up and running

$ CD 08_expressrest$ node app

3.AdvancedRESTAPI

Open Directory 12_advancedrestapi

App.js: Initialize Express Environment Registration route

Specific implementation code for the Routes/api.js:rest API

App.js, registering the routing code is simple

Initialize a api.js instance of var API = require ('./routes/api ');//Initialize a Express.js instance var app = Express ();// Point the specified URL route handler to the Api.js file App.use ('/api ', API);

The URLs for each API in Routes/api.js are processed separately by Get\put\post\delete

Resource	GET	PUT	POST	DELETE
Collection URI, such as http://api.example.com/v1/dogs/	List all T He dogs	Replace all the dogs with a new collection of dogs.	Create a new dog in the collection.	Delete the entire dog collection.
Element URI, such as HTTP://API.EXAMPLE.COM/V1/DOG/1	Get A Specific dog.	Replace a dog in the collection with another dog.	not used.	Delete the dog from the collection.

var express = require (' Express '); var router = Express.    Router (); var dogs = [{"dog_id": "0", "dog_name": "Ginger"}, {"dog_id": "1", "Dog_name": "Ruby"}, { "dog_id": "2", "Dog_name": "Buddy"}];/* GET All Dogs */router.get ('/dogs/', function (req, res, next) {Res.json (do GS);});  * PUT Replace All dogs */router.put ('/dogs/', function (req, res, next) {Console.log (req.body);  Dogs = Req.body; Res.json ({"STATUS": "$ OK"}); * POST Create a new dog */router.post ('/dogs/', function (req, res, next) {Dogs.push (req.body) Res.json ({"STATUS": "200 OK "});  * Delete Delete the entire dog collection */router.delete ('/dogs/', function (req, res, next) {dogs = []; Res.json ({"STATUS": "$ OK"});  * GET a specific dog */router.get ('/dogs/:id ', function (req, res, next) {var i = 0;  var dog = null;      for (i = 0; I! = Dogs.length; i++) {if (dogs[i].dog_id = = req.params.id) {dog = Dogs[i];    Break }} dog!== null? Res.json (dog): Res.json ({"STATUS":" 404 Not FOUND "})});/* PUT replace a specific dog with another dog */router.put ('/dogs/:id ', function (req, res, next) {  var i = 0;  var dog = null;      for (i = 0; I! = Dogs.length; i++) {if (dogs[i].dog_id = = req.params.id) {dog = Dogs[i];    Break  }} if (dog!== null) {dog.dog_name = req.body[' Dog_name '] Res.json ({"STATUS": "OK"});  } else {Res.json ({"STATUS": "404 Not FOUND"});  }});/* DELETE a specific dog from the collection */router.delete ('/dogs/:id ', function (req, res, next) {var i = 0;      for (i = 0; I! = Dogs.length; i++) {if (dogs[i].dog_id = = req.params.id) {Dogs.splice (I, 1);    Return Res.json ({"STATUS": "$ OK"}); }} return Res.json ({"STATUS": "404 Not FOUND"}); Module.exports = router;

　　

Nodejs in Visual Studio Code 03. Learn Express