Remove key from object JavaScript

Use the delete operator to Remove a key (or property) from an object in JavaScript. The delete operator allows you to remove a property from an object.

If JavaScript successfully removes the key from the object, then the delete expression will return true.

Remove key from object JavaScript examples

Simple example code.

<!DOCTYPE html>
<html>

<body>
  <script >
    let animals = {
      'Cow': 'Moo',
      'Cat': 'Meow',
      'Dog': 'Bark'
    };

    delete animals.Cow;
    delete animals['Dog'];

    console.log(animals);
  </script>
</body>
</html>

Output:

How to find and remove the object key-value pair in JavaScript?

Answer: To find and remove an object key-value pair in JavaScript, you can use a combination of the delete operator and the Object.keys() method or a for...in loop. Here are examples of both methods:

Using Object.keys() method:

const myObj = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3'
};

// Find and remove key2 from myObj
if (myObj.hasOwnProperty('key2')) {
  delete myObj.key2;
}

console.log(myObj);

Using for...in loop:

const myObj = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3'
};

// Find and remove key2 from myObj
for (let key in myObj) {
  if (key === 'key2') {
    delete myObj[key];
  }
}

console.log(myObj); // Output: { key1: 'value1', key3: 'value3' }

Output: { key1: ‘value1’, key3: ‘value3’ }

Do comment if you have any doubts or suggestions on this JS object topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version

Remove key from object JavaScript