Get HTML5 localStorage keys

Question

I m just wondering how to get all key values in localStorage     I have tried to retrieve the values with a simple JavaScript loop  for  var i 1  i  lt   localStorage length  i          alert localStorage getItem i       But it works only if the keys are progressive numbers  starting at 1     How do I get all the keys  in order to display all available data

User · Answer

This will print all the keys and values on localStorage:

ES6:

for (let i=0; i< localStorage.length; i++) {
    let key = localStorage.key(i);
    let value = localStorage[key];
    console.log(`localStorage ${key}:  ${value}`);
}

User · Answer

We can also read by the name   Say we have saved the value with name  user  like this  localStorage setItem  user   user Detail     Then we can read it by using   localStorage getItem  user      I used it and it is working smooth  no need to do the for loop

User · Answer

You can use the localStorage key index  function to return the string representation  where index is the nth object you want to retrieve

User · Answer

For those mentioning using Object keys localStorage     don t because it won t work in Firefox  ironically because Firefox is faithful to the spec   Consider this   localStorage setItem  key    value1   localStorage setItem  key2    value2   localStorage setItem  getItem    value3   localStorage setItem  setItem    value4     Because key  getItem and setItem are prototypal methods Object keys localStorage  will only return   key2     You are best to do something like this   let t       for  let i   0  i  lt  localStorage length  i        t push localStorage key i

User · Answer

I agree with Kevin he has the best answer but sometimes when you have different keys in your local storage with the same values for example you want your public users to see how many times they have added their items into their baskets you need to show them the number of times as well then you ca use this   var set   localStorage setItem  key    value    var element   document getElementById  tagId     for   var i   0  len   localStorage length  i  lt  len    i       element innerHTML    localStorage getItem localStorage key i     localStorage key i  length

User · Answer

function listAllItems          for  i 0  i lt localStorage length  i                      key   localStorage key i             alert localStorage getItem key

User · Answer

I like to create an easily visible object out of it like this   Object keys localStorage  reduce function obj  str         obj str    localStorage getItem str        return obj           I do a similar thing with cookies as well   document cookie split      reduce function obj  str        var s   str split            obj s 0  trim      s 1       return obj

User · Answer

If the browser supports HTML5 LocalStorage it should also implement Array prototype map  enabling this   Array apply 0  new Array localStorage length   map function  o  i        return localStorage key i

User · Answer

Since the question mentioned finding the keys  I figured I d mention that to show every key and value pair  you could do it like this  based on Kevin s answer    for   var i   0  len   localStorage length  i  lt  len    i       console log  localStorage key  i            localStorage getItem  localStorage key  i            This will log the data in the format  key  value    Kevin  feel free to just take this info into the your answer if you want

User · Answer

in ES2017 you can use   Object entries localStorage

User · Answer

You can get keys and values like this   for  let  key  value  of Object entries localStorage       console log    key     value

User · Answer

for  var key in localStorage      console log key      EDIT  this answer is getting a lot of upvotes  so I guess it s a common question  I feel like I owe it to anyone who might stumble on my answer and think that it s  right  just because it was accepted to make an update  Truth is  the example above isn t really the right way to do this  The best and safest way is to do it like this   for   var i   0  len   localStorage length  i  lt  len    i       console log  localStorage getItem  localStorage key  i

[javascript] Get HTML5 localStorage keys

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