how to delete a key from an object in javascript code example

Example 1: javascript delete key from object

let person = {
  firstname: 'John',
  lastname: 'Doe'
}

console.log(person.firstname);
// expected output: "John"

delete person.firstname;

console.log(person.firstname);
// expected output: undefined

Example 2: how to remove key value pair from object in javascript

delete object.keyname;

Example 3: javascript remove element from object

delete object.element

Example 4: js remove key from object

// Example 1
var key = "Cow";
delete thisIsObject[key]; 

// Example 2
delete thisIsObject["Cow"];

// Example 3
delete thisIsObject.Cow;

Example 5: nodejs delete object key

delete obj.firstname;