JSON.parse data returned from "flat"

I’m using npm install flat and flattening a multidimensional array
Flatten:

    var flatten = require('flat')


    flatten({
        key1: {
            keyA: 'valueI'
        },
        key2: {
            keyB: 'valueII'
        },
        key3: { a: { b: { c: 2 } } }
    })

    // {
    //   'key1.keyA': 'valueI',
    //   'key2.keyB': 'valueII',
    //   'key3.a.b.c': 2
    // }

However I cannot JSON.parse flatten…how can I use this data when it is returned?

JSON.parse is a method you use on strings to turn them into objects. The value returned by flatten is already an object. If you want to turn it into a string, use JSON.stringify