Transform JSON object to a class/interface object using Typescript

Question

Transform JSON object to a class/interface object using Typescript

I am currently working on converting an API response into a TypeScript class or interface.

The API is returning a list of objects with various properties, but I only require a few specific properties from the response object.

Example of API Response:

    [{
    'Id' : 1,
    'Name': 'test',
    'Description: 'Test',
    'PropertyX': 'x',
    'PropertyY' : 'y'
    },
    ...]

Typescript Class Example:


    Class Response {
     Id: string;
     Name: string;
    }

I would appreciate any suggestions on the best approach to convert the JSON object into a TypeScript object.

json angular class typescript

Answer 1

Answer №1

If you want to streamline the properties used in your app, it's best to create a specific interface for them and disregard the unnecessary ones:

For instance, if your response data includes various properties but you only need Id and Name, define an interface like this:

interface IMyObject {
  Id: String;
  Name: String;
}

You can then cast your response as IMyObject[] throughout your application.

For example, when defining a function that utilizes your response:

function myFunction(response: IMyObject[]) { ... }

Similarly, when you need to return that specific type, you can directly cast it:

return response as MyObject[];

Additionally, to exclude extraneous properties from your object, utilize .map:

const formattedResponse: IMyObject = reponse.map(item => {
  Id: item.Id,
  Name: item.Name
});

Answer 2

If you want to streamline the properties used in your app, it's best to create a specific interface for them and disregard the unnecessary ones:

For instance, if your response data includes various properties but you only need Id and Name, define an interface like this:

interface IMyObject {
  Id: String;
  Name: String;
}

You can then cast your response as IMyObject[] throughout your application.

For example, when defining a function that utilizes your response:

function myFunction(response: IMyObject[]) { ... }

Similarly, when you need to return that specific type, you can directly cast it:

return response as MyObject[];

Additionally, to exclude extraneous properties from your object, utilize .map:

const formattedResponse: IMyObject = reponse.map(item => {
  Id: item.Id,
  Name: item.Name
});

Answer 3

Answer №2

Utilize the forEach method to generate a new object with the desired properties.

myarray=[];
 ngOnInit() {
     this.myvalues();

  }


    myMethod()
        {
           const response = [{
            'Id' : 1,
            'Name': 'test',
            'Description': 'Test',
            'PropertyX': 'x',
            'PropertyY' : 'y'
          }, {
            'Id' : 2,
            'Name': 'test2',
            'Description': 'Test2',
            'PropertyX': 'x2',
            'PropertyY' : 'y2'
          }
        ];

        response.forEach(value=>{
         this.myarray.push(
               {
                'ID':value.Id,
               'Name':value.Name
              }
            )
        });
        console.log(this.myarray);

VIEW WORKING DEMO

Answer 4

Utilize the forEach method to generate a new object with the desired properties.

myarray=[];
 ngOnInit() {
     this.myvalues();

  }


    myMethod()
        {
           const response = [{
            'Id' : 1,
            'Name': 'test',
            'Description': 'Test',
            'PropertyX': 'x',
            'PropertyY' : 'y'
          }, {
            'Id' : 2,
            'Name': 'test2',
            'Description': 'Test2',
            'PropertyX': 'x2',
            'PropertyY' : 'y2'
          }
        ];

        response.forEach(value=>{
         this.myarray.push(
               {
                'ID':value.Id,
               'Name':value.Name
              }
            )
        });
        console.log(this.myarray);

VIEW WORKING DEMO

Transform JSON object to a class/interface object using Typescript

Answer №1

Answer №2

Similar questions

A guide on retrieving an object property in keen.io

JSON file not found by the system

What are some strategies to prevent the occurrence of "<string xmlns="http://schemas.microsoft.com/2003/10/Serialization/">"?

Creating a personalized JSON object using the outcome of a GROUP BY statement in PHP

How to detect changes in Angular 2 using a separate service

Transmitting intricate data sets to the WEB API

Click on the photo and drag your mouse outside of it to zoom out [Angular2]

How to link data from a service to an Angular component in a way that ensures the component gets updated whenever there is new data in the service

Problems arising from positioning elements with CSS and organizing list items

What is the best way to iterate through this JSON data and add it to a div in an HTML document?

The GraphQl Code Generator fails to correctly generate the graphql() function in Next.js applications

Exploring Postgres Commands for Manipulating JSON Arrays

The type 'string' cannot be assigned to type 'ImageSourcePropType'

What is the best way to create a case-insensitive sorting key in ag-grid?

Unable to establish a connection to 'X' as it is not recognized as a valid property

Text hidden within Android fragment

Turn off the interconnected route while utilizing npm to display the tree of dependencies

Decide on the chosen option within the select tag

Sending properties to MUI Box component enhancer (Typescript)

Changing LinkedHashMap<String,String> into an object in Java