How to check if an object has a key in JavaScript?

General Discussions
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2

The most reliable and explicit way to check if an object has a specific key is by using hasOwnProperty(). This method checks if the key exists directly on the object (not inherited from its prototype chain).

if (myObj.hasOwnProperty('key')) {
  console.log('Key exists');
} else {
  console.log('Key does not exist');
}

This method ensures you’re checking only the properties that belong directly to the object and not those inherited from its prototype chain.