JavaScript .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);

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The output will be:

undefined
Gender : male

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