Benchmark: structuredClose(myObject) vs JSON.parse(JSON.stringify(myObject))

structuredClose(myObject) vs JSON.parse(JSON.stringify(myObject)) (version: 0)

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?

Comparing performance of: structuredClone(myObject) vs JSON.parse(JSON.stringify(myObject))

Created: 4 days ago by: Registered User

Jump to the latest result

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));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
structuredClone(myObject)
JSON.parse(JSON.stringify(myObject))

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 4 days ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:130.0) Gecko/20100101 Firefox/130.0

Browser/OS: Firefox 130 on Linux

View result in a separate tab

Test name	Executions per second
structuredClone(myObject)	156312.0 Ops/sec
JSON.parse(JSON.stringify(myObject))	207797.1 Ops/sec