Parsing JSON to Object in Angular 2

I have a file location.json, containing JSON string of the form:

{
"locations": [
{
"id": 1,
"places": [
{
"id": 1,
"city": "A",
"state": "AB"
}
]
}
}


I created classes of the form:

export class Location{
constructor(public id: number,
public places: Place[],
}

export class Place {
constructor(
public id: number,
public city: string,
public state: string
}


How do I parse the JSON string to object? I did something like this:

...
export class DashboardComponent {

locations: Locations[];

constructor(private locationService:LocationService) {
this.getLocations()
}

getLocations(){
this.locationService.get('assets/location.json')
.subscribe(res => this.location = res);
}

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