Before you install LoopBack, make sure to download and install Node.js (version 8.9.x or higher), a JavaScript + runtime.
+The LoopBack 4 CLI is a command-line interface that can scaffold a project or extension. The CLI provides + the fastest way to get started with a LoopBack 4 project that adheres to best practices. +
+++$ npm install -g loopback-cli +
To create a new project, run the CLI as follows. +
+++$ lb4 app +
Answer the prompts as follows. +
+++[?] Project name: getting-started +[?] Project description: Getting started tutorial +[?] Project root directory: (getting-started) +[?] Application class name: StarterApplication +[?] Select project build settings: Enable tslint, Enable prettier, Enable mocha, Enable loopbackBuild +
The project comes with a "ping" route to test the project. Let's try it out by running the projects. +
+In a browser, visit + http://127.0.0.1:3000/ping +
+++$ cd getting-started +$ npm start +
Now that we have a basic project created, it’s time to add our own controller. Let’s add a simple “Hello + World” controller as follows. +
+++$ lb4 controller +[?] Controller class name: hello +[?] What kind of controller would you like to generate? Empty Controller + create src/controllers/hello.controller.ts + update src/controllers/index.ts +Controller Hello was now created in src/controllers/ +
Paste the following contents into the file /src/controllers/hello.controller.ts.
+
++import {get }from '@loopback/rest'; +export class HelloController { + @get('/hello') + hello(): string { +return 'Hello world!'; + } +} +
Start the application using npm start.
+
Hello world!
+ Follow the tutorial to create a real-world application with LoopBack 4. +
@ Copyright 2018 StrongLoop, an IBM company