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Run results for: JSON.stringify vs structuredClone (with deeply nested objects)

JSON.stringify vs structuredClone

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Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/122.0.6261.89 Mobile/15E148 Safari/604.1
Chrome Mobile iOS 122
iOS 17.3
Mobile
one year ago
Test name Executions per second
JSON.stringify 372375.3 Ops/sec
structuredClone 88698.1 Ops/sec
Script Preparation code:
​x
 
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...'
  },
  deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {deep: {}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
};
​
var myCopy = null;
Tests:

  • JSON.stringify

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

  • structuredClone

     
    myCopy = structuredClone(MyObject);