Run results for: JSON.stringify + JSON.parse vs structuredClone

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152.0) Gecko/20100101 Firefox/152.0

Browser: Firefox 152

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

structuredClone

1.1M/s

JSON.stringify + JSON.parse

947K/s

View exact numbers

Test name	Executions per second
✓ structuredClone	1,051,283 Ops/sec
JSON.stringify + JSON.parse	947,104 Ops/sec

Script Preparation code:

var obj = {
  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...'
  }
};

Tests:

JSON.stringify + JSON.parse
JSON.parse(JSON.stringify(obj));
structuredClone
structuredClone(obj);