Keyword Analysis & Research: javascript check if localstorage key exists


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Frequently Asked Questions

How to check if a key exists or not in localStorage?

To check if a key exists or not in localStorage, we can use the localStorage.getItem () method. The localStorage.getItem () method takes the key as an argument and returns the key’s value. if a key doesn’t exist it returns the null.

How do I check if an item is set in localStorage?

Since the Storage object (which is accessed via window.localStorage property) has no hasItem () method, you can simply use the getItem () method instead to check if an item is set or not (as it returns null when the key does not exist). For example: const itemSet = (localStorage.getItem('nonExistent') !== null); if (itemSet) { // ... }

What if the key does not exist in the list?

If the given key does not exist in the list associated with the object then this method must return null. You should actually check against null. if (localStorage.getItem ("username") === null) { //...


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