Learn LOOPBACK with Real Code Examples

Install Node.js (LTS recommended)

Install LoopBack CLI: `npm install -g @loopback/cli`

Create a new project: `lb4 app my-app`

Define models and data sources

Run project with `npm start`

Install Node.js (LTS)

Install LoopBack CLI globally

Create project with lb4 app

Define models, repositories, controllers

Run locally and test with API Explorer

package.json - Node.js dependencies

tsconfig.json - TypeScript configuration

src/models/ - data models

src/repositories/ - database access

src/controllers/ - REST endpoints

npm install -g @loopback/cli - install CLI

lb4 app my-app - create project

lb4 model - generate model

lb4 repository - generate repository

npm start - run app

i18n via middleware or external packages

Supports UTF-8 content

Locale detection can be implemented in middleware

Error messages externalized for translation

Integrates with Node.js i18n ecosystem

APIs accessible through standard HTTP clients

CORS support via middleware

API Explorer for testing endpoints

JSON response structure consistent and predictable

Error handling standardized for clients

Primarily JSON API responses

API Explorer provides interactive API UI

Optional integration with front-end frameworks

Serve static assets via middleware if needed

HTML templating possible via Express adapters

Application state managed via models and repositories

Middleware can modify request/response

Sessions can be added via connectors or third-party packages

Caching can be implemented externally

Services handle business state logic

Repositories connect to data sources

Models define schema and validation

CRUD operations auto-exposed via REST

Connector-based integration with external APIs/databases

Logging and auditing supported via middleware