Converting JSON data into an Angular object

Question

Converting JSON data into an Angular object

I'm struggling to map the JSON data below to an Angular 7 object:

    [
      {
        "id": "123456",
        "general": {
          "number": "123",
          "name": "my name 1",
          "description": "My description with <li> html tags </li>"
        },
        "option1": {
          "name": "option1 name"
        },
        "option2": {
          "suboption2": {
            "name": "suboption2 name"
          }
        }
      },
      {
        "id": "789123",
        "general": {
          "number": "456",
          "name": "my name 2",
          "description": "My description with <li> html tags </li>"
        },
        "option1": {
          "name": "option2 name"
        },
        "option2": {
          "suboption2": {
            "description": "My description with <li> html tags </li>"
          }
        }
      }
    ]

I attempted to create a MyClass instance using fields that match those in the JSON file and then cast the JSON data to this class, but I encountered challenges along the way.

json angular typescript

Answer 1

Answer №1

To streamline the data transformation process, I suggest implementing a mapper service. This service will take your DTOs (data transfer objects which represent your JSON response) as input and generate instances of your MyClass object as output.

Within the map function of your service, you can iterate through the array of DTOs and instantiate a new MyClass object for each DTO. Finally, the function will return an array containing all the MyClass instances created.

map(myClassDtos:MyClassDTO[]):MyClass[]{
    return myClassDtos.map(dto=>{
        return new MyClass(...);
    });
}

Answer 2

To streamline the data transformation process, I suggest implementing a mapper service. This service will take your DTOs (data transfer objects which represent your JSON response) as input and generate instances of your MyClass object as output.

Within the map function of your service, you can iterate through the array of DTOs and instantiate a new MyClass object for each DTO. Finally, the function will return an array containing all the MyClass instances created.

map(myClassDtos:MyClassDTO[]):MyClass[]{
    return myClassDtos.map(dto=>{
        return new MyClass(...);
    });
}

Answer 3

Answer №2

To start off, I suggest restructuring your JSON format to make it more organized and easier to work with:

[
    {
        "id": "123456",
        "general": {
            "number": "123",
            "name": "my name 1",
            "description": "My description with <li> html tags </li>"
        },
        "options": [
            {
                "name": "option1 name"
            },
            {
                "name": "option2 name",
                "suboptions": [
                    {
                        "name": "suboption1 name"
                    }
                ]
            }
        ]
    },
    {
        "id": "789123",
        "general": {
            "number": "456",
            "name": "my name 2",
            "description": "My description with <li> html tags </li>"
        },
        "options": [
            {
                "name": "option1 name"
            },
            {
                "name": "option2 name",
                "suboptions": [
                    {
                        "name": "suboption1 name"
                    },
                    {
                        "name": "suboption2 name"
                    }
                ]
            },
            {
                "name": "option3 name",
                "suboptions": [
                    {
                        "name": "suboption1 name"
                    },
                    {
                        "name": "suboption2 name"
                    }
                ]
            }
        ]
    }
]

Next, create model interfaces to represent each item in the JSON array:

main-element.ts

import { General } from './general';
import { Options } from './options';

export interface Element {
    id?: number;
    general?: General;
    options?: Options[];
}

generl.ts

export interface General {
    number?: number;
    name?: string;
    description?: number;
}


import { Suboptions } from './suboptions';

options.ts

export interface Options {
    name?: string;
    suboptions?: Suboptions[];
}

suboptions.ts

export interface Suboptions {
    name?: string;
}

Lastly, when mapping the data, utilize the following approach:

import { Component } from '@angular/core';
import { Element } from './models/main-element';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  private elementsList: Element[] = [];

  constructor(){
  }

  mapJSON(){
      this.elementsList = this.someJsonString; //Insert your JSON data here
      console.log(this.elementsList);
  }
}

If you print out the elementsList object in the console, you will see the structured data as shown in the screenshot below:

https://i.sstatic.net/iduMg.png

Answer 4

To start off, I suggest restructuring your JSON format to make it more organized and easier to work with:

[
    {
        "id": "123456",
        "general": {
            "number": "123",
            "name": "my name 1",
            "description": "My description with <li> html tags </li>"
        },
        "options": [
            {
                "name": "option1 name"
            },
            {
                "name": "option2 name",
                "suboptions": [
                    {
                        "name": "suboption1 name"
                    }
                ]
            }
        ]
    },
    {
        "id": "789123",
        "general": {
            "number": "456",
            "name": "my name 2",
            "description": "My description with <li> html tags </li>"
        },
        "options": [
            {
                "name": "option1 name"
            },
            {
                "name": "option2 name",
                "suboptions": [
                    {
                        "name": "suboption1 name"
                    },
                    {
                        "name": "suboption2 name"
                    }
                ]
            },
            {
                "name": "option3 name",
                "suboptions": [
                    {
                        "name": "suboption1 name"
                    },
                    {
                        "name": "suboption2 name"
                    }
                ]
            }
        ]
    }
]

Next, create model interfaces to represent each item in the JSON array:

main-element.ts

import { General } from './general';
import { Options } from './options';

export interface Element {
    id?: number;
    general?: General;
    options?: Options[];
}

generl.ts

export interface General {
    number?: number;
    name?: string;
    description?: number;
}


import { Suboptions } from './suboptions';

options.ts

export interface Options {
    name?: string;
    suboptions?: Suboptions[];
}

suboptions.ts

export interface Suboptions {
    name?: string;
}

Lastly, when mapping the data, utilize the following approach:

import { Component } from '@angular/core';
import { Element } from './models/main-element';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  private elementsList: Element[] = [];

  constructor(){
  }

  mapJSON(){
      this.elementsList = this.someJsonString; //Insert your JSON data here
      console.log(this.elementsList);
  }
}

If you print out the elementsList object in the console, you will see the structured data as shown in the screenshot below:

https://i.sstatic.net/iduMg.png

Converting JSON data into an Angular object

Answer №1

Answer №2

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