.setItem()

The .setItem() method updates the value to the specified storage object key, if it exists, else adds the key to the specified storage object and returns undefined.

Syntax

localStorage.setItem(key, value);
sessionStorage.setItem(key, value);

Both key and value are required parameters.

• The key is the name of the key to create.
• The value is the value to create/update the key.

Example

This example demonstrates a basic implementation of the .setItem() method:

console.log(localStorage.setItem('name', 'mark'));
localStorage.setItem('gender', 'male');
console.log('Gender : ', localStorage.gender);

The output will be:

undefined
Gender : male