how to filter keys from localStorage with a regex

findLocalItems.js

// returns an array of localStorage items in key/value pairs based on a query parameter
// returns all localStorage items if query isn't specified
// query can be a string or a RegExp object

function findLocalItems (query) {
  var i, results = [];
  for (i in localStorage) {
    if (localStorage.hasOwnProperty(i)) {
      if (i.match(query) || (!query && typeof i === 'string')) {
        value = JSON.parse(localStorage.getItem(i));
        results.push({key:i,val:value});
      }
    }
  }
  return results;
}

Thank you! I soooooooo needed to find this today. =]

I did have to remove the JSON.parse in order for it to work for my stuff.

Thanks again.

why do you need this line:
if (localStorage.hasOwnProperty(i)) {
?

why do you need this line:
if (localStorage.hasOwnProperty(i)) {
?

i in localStorage iterates over all enumerable and non-Symbol properties not only over own properties

If you only want to consider properties attached to the object itself, and not its prototypes, use getOwnPropertyNames() or perform a hasOwnProperty() check (propertyIsEnumerable() can also be used). Alternatively, if you know there won't be any outside code interference, you can extend built-in prototypes with a check method.

Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in