Как проверить что объект {} не пустой на javascript?

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const obj = {};
if (Object.keys(obj).length === 0) {
  console.log('Object is empty');
} else {
  console.log('Object is not empty');
}

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const obj = {};
let isEmpty = true;
for (let key in obj) {
  isEmpty = false;
  break;
}
if (isEmpty) {
  console.log('Object is empty');
} else {
  console.log('Object is not empty');
}

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const obj = {};
if (Object.getOwnPropertyNames(obj).length === 0) {
  console.log('Object is empty');
} else {
  console.log('Object is not empty');
}

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const obj = {};
if (JSON.stringify(obj) === '{}') {
  console.log('Object is empty');
} else {
  console.log('Object is not empty');
}