Run results for: JSON.stringify vs structuredClone vs spread vs Object.assign()

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.0

Browser: Firefox 150

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 months ago

Object.assign

34.8M/s

spread

13.6M/s

JSON.stringify

1.0M/s

structuredClone

946K/s

View exact numbers

Test name	Executions per second
✓ Object.assign	34,809,060 Ops/sec
spread	13,646,557 Ops/sec
JSON.stringify	1,018,194 Ops/sec
structuredClone	946,017 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);
spread
myCopy = {...MyObject};
Object.assign
myCopy = Object.assign({}, MyObject);