Run results for: JSON.stringify vs structuredClone

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6,2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.7

Device Platform: Mobile

Date tested: 2 years ago

JSON.stringify

456K/s

structuredClone

390K/s

View exact numbers

Test name	Executions per second
✓ JSON.stringify	456,175 Ops/sec
structuredClone	389,637 Ops/sec

Script Preparation code:

var MyObject = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var myCopy = null;

Tests:

JSON.stringify
myCopy = JSON.parse(JSON.stringify(MyObject));
structuredClone
myCopy = structuredClone(MyObject);