Run results for: structuredClose(myObject) vs JSON.parse(JSON.stringify(myObject))

Both structuredClone(myObject) and JSON.parse(JSON.stringify(myObject)) can be used to create deep copies of JavaScript objects, but which is faster for a decent sized object?

Go to the benchmark

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0

Browser: Firefox 131

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
structuredClone(myObject)	33920.0 Ops/sec
JSON.parse(JSON.stringify(myObject))	45901.5 Ops/sec

Script Preparation code:

var myObject = {
    name: 'Jane Darlene',
    age: 25,
    score: 120,
    weight: 65.5,
    balabnce: 2000.0,
    premium: false,
    birthDate: '2024-10-02T03:23:58.663Z',
    testNull: null,
    title: 'Some other title',
    description: 'Some other description',
    address: {
        street: '123 Main St',
        city: 'Anytown',
        state: 'NY',
        zip: 12345,
        country: 'USA',
    },
    additionalAddresses: [{
            street: '456 Elm St',
            city: 'Anytown',
            state: 'NY',
            zip: 12345,
            country: 'USA',
        },
        {
            street: '789 Oak St',
            city: 'Anytown',
            state: 'NY',
            zip: 12345,
            country: 'USA',
        },
    ],
    profile: {
        firstName: 'Jane',
        lastName: 'Darlene',
    },
    features: ['One', 'Two', 'Three'],
    favorites: [{
            slug: 'first',
            postname: 'First post'
        },
        {
            slug: 'second',
            postname: 'Second post'
        },
    ],
    todos: {
        1: {
            id: 1,
            text: 'First todo',
            done: false
        },
        2: {
            id: 2,
            text: 'Second todo',
            done: true
        },
    },
};

Tests:

structuredClone(myObject)
structuredClone(myObject);
JSON.parse(JSON.stringify(myObject))
JSON.parse(JSON.stringify(myObject));