How to check that two objects have the same set of property names with JavaScript?

To check that two objects have the same set of property names with JavaScript, we use the Object.keys method.

For instance, we write

const compareKeys = (a, b) => {
  const aKeys = Object.keys(a).sort();
  const bKeys = Object.keys(b).sort();
  return JSON.stringify(aKeys) === JSON.stringify(bKeys);
};

to define the compareKeys function.

In it, we get the keys of objects a and b with Object.keys in an array.

Then we sort both arrays with sort.

Then we convert both arrays to JSON strings with JSON.stringify and compare to see if they’re equal.