Cast a JSON Object to a TypeScript class

Question

My JSON object is being read from a remote REST server. This object has all the properties of a typescript class. How can I cast object to a variable type?

I don't want to populate a typescript var (ie have a constructor that takes this JSON object). It's large and copying everything across sub-object by sub-object & property by property would take a lot of time.

Answer 1

I had the same issue and this did the job : https://github.com/pleerock/class-transformer.

It works like this :

let jsonObject = response.json() as Object;
let fooInstance = plainToClass(Models.Foo, jsonObject);
return fooInstance;

It supports nested children but you have to decorate your class's member.