Is it advisable to specify data types for my JSON data in TypeScript?

For the shopping application in my project, I am utilizing a JSON structure to categorize products as either hot or branded. However, I encountered an issue when trying to define a type for the entire JSON object labeled "full". Despite my attempts, it appears that the approach I took does not align with the actual data type.

import {Product} from './Product';

export class Data {
  products: {branded: Product[], hot: Product[]};
  users: {}[];
}

export class Product {
  content: string;
  image: string;
  price: string;
  title: string;
}

export const DATA = {
  "products": {
    "hot": [
      {
        "title": "Hot Tittle 1",
        "content": "Hot Content 1",
        "image": "...",
        "price": "100"
      },
      ...
    ]
};

However, I have been facing difficulties as the code is generating the following error message: Type 'object' is not assignable to type 'Data'. It is imperative that I identify the correct method for defining the type for my JSON data structure.

The error persists within my component:

import { Component, OnInit } from '@angular/core';
import {AuthService} from '../../services/auth.service';
import {ShoppingService} from '../../services/shopping.service';
import {Product} from '../../models/Product';
import {Data} from '../../models/Data';

@Component({
  selector: 'app-main',
  templateUrl: './main.component.html',
  styleUrls: ['./main.component.scss']
})
export class MainComponent implements OnInit {
  data: Data;
  brandedProducts: Product[];
  hotProducts: Product[];

  constructor(
    private shoppingService: ShoppingService
  ) { }

  ngOnInit(): void {
    this.getData();

    this.brandedProducts = Object.values(this.data.products.branded);
    this.hotProducts = Object.values(this.data.products.hot);
  }

  getData(): void {
    this.shoppingService.getData().subscribe(data => {
      // TS2739: Type '{}' is missing the following properties from type 'Data': products, users
      return this.data = data;
    });
  }

}

Answer №1

Your Data class is not accurate. It is advisable to utilize interfaces rather than classes in situations where no methods are required for types.

An appropriate interface would look like this:

export interface Data {
  products: {branded: Product[], hot: Product[]};
  users: {[key: string]: any}[];
}

Alternatively, you can assign a proper type to Users like this:

export interface User {
  id: number;
  email: string;
  password: string;
}

export interface Data {
  products: {branded: Product[], hot: Product[]};
  users: User[];
}

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