Convert json response to object in typescript

area-list.component.ts

import { CopyHelper } from '../../helpers/copy.helper';
import { Area } from '../../models/area';

export class AreaListComponent 
{
    ...
    getAreas(): void
    {
        this.service.getAll()
            .subscribe(response =>
            {
                this.apiErrors = false;
                this.apiErrorsMessage = "";

                if (response)
                    this.source = CopyHelper.toArray(Area, response);
            },
            error =>
            {
                this.apiErrors = true;
                this.apiErrorsMessage = error._body;
            });
    }
}

area.ts

export class Area 
{
    id: number = 0;
    name: string = "";
}

copy.helper.ts

export class CopyHelper
{
    public static toArray<T>(t: {new(): T; }, oldValues: any): Array<T>
    {
        let values = new Array<T>();
    
        for (const old of oldValues) 
            values.push(this.toObject(t, old));
    
        return values;
    }

    public static toObject<T>(t: {new(): T; }, oldValue: any): T
    {
        var newValue = Object.assign(new t(), oldValue);
    
        return newValue;
    }
}