[foresterre]

Depending on your needs (i.e. how you would otherwise use your output jspn), using the reviver can have a significant impact on performance. JSON.parse itself is hyper-optimized. At the company I work we used the reviver for almost exactly this, but profiling showed that using the reviver had enormous impact on performance. We cut it out, and won in the seconds of performance for some large json's.

[HanyouHottie]

Instead of using the reviver you can deserialize as a plain string, then later reassign the property as the type you want. E.g.:

  const myObject = JSON.parse(text);
  myObject.date = new Date(myObject.date);