There are various methods in JavaScript that you can use to check whether a key exists in your object or not :
Using the hasOwnProperty method
JavaScript
const myObject = { key1: 'value1', key2: 'value2' };
if (myObject.hasOwnProperty('key1')) {
console.log('Key exists!');
} else {
console.log('Key does not exist!');
}Using the in operator
JavaScript
const myObject = { key1: 'value1', key2: 'value2' };
if ('key1' in myObject) {
console.log('Key exists!');
} else {
console.log('Key does not exist!');
}Using undefined check
JavaScript
const myObject = { key1: 'value1', key2: 'value2' };
if (myObject['key1'] !== undefined) {
console.log('Key exists!');
} else {
console.log('Key does not exist!');
}