remove element from object by key javascript code example

Example 1: remove key from object array javascript

array.forEach(function(v){ delete v.bad });

Example 2: 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 3: how to remove key value pair from object in javascript

delete object.keyname;

Example 4: javascript remove object key

var obj = {a: 5, b: 3};
delete obj["a"];
console.log(obj); // {b: 3}