Run results for: JSON.stringify vs structuredClone

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 [FBAN/FBIOS;FBAV/469.0.0.31.108;FBBV/627618824;FBDV/iPhone15,2;FBMD/iPhone;FBSN/iOS;FBSV/17.5.1;FBSS/3;FBCR/;FBID/phone;FBLC/en_GB;FBOP/80]

Browser: Mobile Safari 17

Operating system: iOS 17.5.1

Device Platform: Mobile

Date tested: one year ago

JSON.stringify

1.6M/s

structuredClone

893K/s

View exact numbers

Test name	Executions per second
✓ JSON.stringify	1,637,305 Ops/sec
structuredClone	893,018 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);