Controllers

Controllers in LoopBack 4 handle HTTP requests and define REST endpoints.

Overview

The API has 606+ controllers handling various business domains:

• User management
• Ticket system
• NCR (Non-Conformance Reports)
• Production tracking
• HR operations
• IT management
• And many more...

Controller Basics

A controller is a TypeScript class decorated with @api:

import { get, post, param, requestBody } from '@loopback/rest';
import { repository } from '@loopback/repository';
import { TicketRepository } from '../repositories';
import { Ticket } from '../models';

@api({ basePath: '/tickets' })
export class TicketController {
  constructor(
    @repository(TicketRepository)
    public ticketRepository: TicketRepository,
  ) {}

  @get('/')
  async findAll(): Promise<Ticket[]> {
    return this.ticketRepository.find();
  }

  @get('/{id}')
  async findById(@param.path.number('id') id: number): Promise<Ticket> {
    return this.ticketRepository.findById(id);
  }

  @post('/')
  async create(@requestBody() ticket: Ticket): Promise<Ticket> {
    return this.ticketRepository.create(ticket);
  }
}

Coming Soon

This page is under construction. More details will be added about:

• Controller structure
• Request/response handling
• Validation
• Error handling
• Best practices

For now, refer to:

• LoopBack 4 Controllers Documentation
• API Overview
• Getting Started