Run results for: Jason stringify vs object.keys

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/121.0.6167.171 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 121

Operating system: iOS 17.2

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Object.keys	11821984.0 Ops/sec
JSON string	937648.2 Ops/sec

Script Preparation code:

var obj = {
  "employees": [
    {
      "id": 1,
      "name": "John Doe",
      "position": "Software Engineer",
      "department": "Development",
      "skills": ["JavaScript", "React", "Node.js"],
      "salary": 80000,
      "address": {
        "street": "123 Main St",
        "city": "Anytown",
        "state": "CA",
        "zip": "12345"
      }
    },
    {
      "id": 2,
      "name": "Jane Smith",
      "position": "Project Manager",
      "department": "Management",
      "skills": ["Agile", "Scrum", "Communication"],
      "salary": 90000,
      "address": {
        "street": "456 Elm St",
        "city": "Othertown",
        "state": "NY",
        "zip": "67890"
      }
    },
    {
      "id": 3,
      "name": "Alice Johnson",
      "position": "Quality Assurance Engineer",
      "department": "Quality Assurance",
      "skills": ["Testing", "Automation", "Selenium"],
      "salary": 70000,
      "address": {
        "street": "789 Maple Ave",
        "city": "Sometown",
        "state": "TX",
        "zip": "54321"
      }
    }
  ],
  "projects": [
    {
      "id": 1,
      "name": "Project Alpha",
      "team": ["John Doe", "Jane Smith"],
      "budget": 100000,
      "deadline": "2024-12-31"
    },
    {
      "id": 2,
      "name": "Project Beta",
      "team": ["Alice Johnson"],
      "budget": 50000,
      "deadline": "2024-06-30"
    }
  ],
  "departments": [
    {
      "name": "Development",
      "manager": "John Doe",
      "employees": ["John Doe"]
    },
    {
      "name": "Management",
      "manager": "Jane Smith",
      "employees": ["Jane Smith"]
    },
    {
      "name": "Quality Assurance",
      "manager": "Alice Johnson",
      "employees": ["Alice Johnson"]
    }
  ]
}

Tests:

Object.keys
Object.keys(obj).length === 0
JSON string
JSON.stringify(obj) === "{}"

Run results for: Jason stringify vs object.keys

Object.keys

JSON string