Parse JSON String into a Particular Object Prototype in JavaScript

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The current answers contain a lot of hand-rolled or library code. This is not necessary.

  1. Use JSON.parse('{"a":1}') to create a plain object.

  2. Use one of the standardized functions to set the prototype:

    • Object.assign(new Foo, { a: 1 })
    • Object.setPrototypeOf({ a: 1 }, Foo.prototype)

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