Check if exist any Key localStorage Javascript

Question

I need to check if there is any key in localStorage This code did not work

    if (localStorage.user === undefined) {
      alert('There is no key!'); 
    }

Possible duplicate of [How to check whether a Storage item is set?](https://stackoverflow.com/questions/3262605/how-to-check-whether-a-storage-item-is-set) — coturiv, Dec 16 '17 at 11:41
Or also look here and add your own code: https://stackoverflow.com/questions/17745292/all-local-storage-items — Oliver F., Dec 16 '17 at 11:50

codejockie · Accepted Answer · 2017-12-16T12:00:50.497

2

if (Object.keys(localStorage).length === 0) {
  alert('There is no key!'); 
}

edited Dec 16 '17 at 12:00

answered Dec 16 '17 at 11:47

codejockie

Sajeetharan · Answer 2 · 2017-12-16T11:46:25.047

0

You need to use getItem

if (localStorage.getItem("user") === null) {
    alert('Não há chave!'); 
}

EDIT You can check if the localstorage is empty by

if (localStorage.length == 0)

edited Dec 16 '17 at 11:46

answered Dec 16 '17 at 11:38

Sajeetharan

I need to check any key, not a specific key. – Hugo Nascimento Dec 16 '17 at 11:43

2 Answers2