Sometimes, we want to check if a key exists with HTML5 LocalStorage and JavaScript.
In this article, we’ll look at how to check if a key exists with HTML5 LocalStorage and JavaScript.
How to check if a key exists with HTML5 LocalStorage and JavaScript?
To check if a key exists with HTML5 LocalStorage and JavaScript, we can use the getItem method.
For instance, we write
if (localStorage.getItem("username") === null) {
//...
}
to check if the entry with key 'username' exists or not with getItem.
If it returns null, then the entry doesn’t exist.
Conclusion
To check if a key exists with HTML5 LocalStorage and JavaScript, we can use the getItem method.
