Run results for: JSON.parse(JSON.stringify())1 vs structuredClone

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

structuredClone

232/s

JSON

224/s

View exact numbers

Test name	Executions per second
✓ structuredClone	232 Ops/sec
JSON	224 Ops/sec

Script Preparation code:

function createBigObject(depth) {
    const obj = {};
    for (let i = 0; i < 5000; i++) {
        obj[i + Math.floor(Math.random() * 10000)] = {
            [Math.random() * 10000]: Math.random() * 10000,
        };
    }
    return obj;
}
var bigObj = createBigObject()
var clone;

Tests:

JSON
clone = JSON.parse(JSON.stringify(bigObj))
structuredClone
clone = structuredClone(bigObj)