Run results for: JSON Parse vs StructuredClone bigger object

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 26

Operating system: iOS 18.7

Device Platform: Mobile

Date tested: 4 months ago

JSON.parse(JSON.stringify())

377K/s

strucutredClone

215K/s

View exact numbers

Test name	Executions per second
✓ JSON.parse(JSON.stringify())	376,892 Ops/sec
strucutredClone	215,453 Ops/sec

Script Preparation code:

var object = {
    type: "FeatureCollection",
    features: [{
            type: "Feature",
            properties: {},
            geometry: {
                type: "Point",
                coordinates: [4.483605784808901, 51.907188449679325]
            }
        },
        {
            "type": "Feature",
            "properties": {},
            "geometry": {
                "type": "Polygon",
                "coordinates": [
                    [
                        [3.974369110811523, 51.907355547778565],
                        [4.173944459020191, 51.86237166892457],
                        [4.3808076710679416, 51.848867725914914],
                        [4.579822414365026, 51.874487141880024],
                        [4.534413416598767, 51.9495302480326],
                        [4.365110733567974, 51.92360787140825],
                        [4.179550508127079, 51.97336560819281],
                        [4.018096293847009, 52.00236546429852],
                        [3.9424146309028174, 51.97681895676649],
                        [3.974369110811523, 51.907355547778565]
                    ]
                ]
            }
        }
    ]
};

var copy = null;

Tests:

strucutredClone
copy = structuredClone(object);
JSON.parse(JSON.stringify())
copy = JSON.parse(JSON.stringify(object));

Run results for: JSON Parse vs StructuredClone bigger object

Comparses JSON.parse(JSON.stringify()) vs structuredClone on a bigger JSON object

strucutredClone

JSON.parse(JSON.stringify())