json-to-class.ts

// npm install --save lodash @types/lodash
import * as lodash from 'lodash';

class A {
  public property: number;
}

class B {
  public a: A;
}

class C {
  constructor(object: C) {
    (Object as any).assign(this, object);
  }

  public name: string;
  public b: B;
}

const c = new C(JSON.parse('{ "name": "Billy", "b": { "a": { "property": 42 } } }'));
const b = c.b;
console.log(JSON.stringify(c)); // {"name":"Billy","b":{"a":{"property":42}}}
lodash.merge(c, JSON.parse('{ "b": { "a": { "property": 666 } } }'));
console.log(JSON.stringify(c)); // {"name":"Billy","b":{"a":{"property":666}}}
console.log(b === c.b); // true