The correct way to convert an object to JSON in Angular 2 using TypeScript

I am currently in the process of developing a simple CRUD application using Angular 2 that will allow me to manage products. The issue I am facing is with implementing the post method to create a new product. My backend is built on an ASP.NET Web API framework. The problem arises when I try to convert my Product object into JSON, as it does not format correctly. The ideal JSON structure should look like this:

{
  "ID": 1,
  "Name": "Laptop",
  "Price": 2000
}

However, the JSON being sent from my application looks like this:

{  
   "product":{  
      "Name":"Laptop",
      "Price":2000
   }
}

Why is there an additional "product" wrapper at the beginning of the JSON output? How can I resolve this issue? Below are snippets of my code:

Product.ts

export class Product {

    constructor(
        public ID: number,
        public Name: string,
        public Price: number
    ) { }   
}

Product.service.ts

import {Injectable}   from '@angular/core';
import {Http, Response} from '@angular/http';
import { Headers, RequestOptions } from '@angular/http';
import {Observable} from 'rxjs/Observable';

import {Product} from './product';

// Remaining code omitted for brevity

Create-product.component.ts

import { Component, OnInit }  from '@angular/core';
import { ROUTER_DIRECTIVES } from '@angular/router';

import { Product } from '../product'
import { ProductService } from '../product.service'

// Remaining code omitted for brevity

Create-product.html

<div class="container">
    <h1>Create Product</h1>
    <form (ngSubmit)="addProduct()">
     // Remaining HTML form elements and Angular bindings
    </form>
</div>

Answer №1

Your implementation in product.service.ts with the stringify method needs adjustment.

Simplify to:

JSON.stringify(product)

rather than:

JSON.stringify({product})

I have reviewed your issue and can confirm that it now functions correctly.

Answer №2

If you desire the data in true JSON format, a re-parsing is necessary:

JSON.parse(JSON.stringify(object))

Answer №3

If your main focus is on displaying the JSON data within your HTML, one approach is to utilize a pipe within an interpolation like this:

<p> {{ product | json }} </p>

While I cannot guarantee its compatibility with all versions of AngularJS, I can confirm that it functions flawlessly in my Ionic App (built with Angular 2+).

Answer №4

You're wrapping the product in a container once more. Experiment with transforming it as follows:

const data = JSON.stringify(product); 

Answer №5

Successfully tested and functioning in Angular version 9.0

If you are fetching data via an API call:

array: [];

ngOnInit() {
    this.service.method()
        .subscribe(
            data => {
                this.array = JSON.parse(JSON.stringify(data.object));
            }
        )
}

}

You can utilize the array to display your API data results in the HTML template.

For example:

<p>{{array['something']}}</p>

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