user2025469 user2025469 - 1 year ago 113
HTML Question

check if localStorage is available

I know there has been many questions about checking for localStorage but what if someone manually shuts it off in their browser? Here's the code I'm using to check:

localStorage.setItem('mod', 'mod');
if (localStorage.getItem('mod') != null){
alert ("yes");
alert ("no");

Simple function and it works. But if I go into my Chrome settings and choose the option "Don't Save Data" (I don't remember exactly what it's called), when I try to run this function I get nothing but "Uncaught Error: SecurityError: DOM Exception 18". So is there a way to check if the person has it turned off completely?

UPDATE: This is the second function I tried and I still get no response (alert)

try {
localStorage.setItem("name", "Hello World!");
} catch (e) {
alert('Quota exceeded!');

Joe Joe
Answer Source

Use modernizr's approach (you might want to change my function name to something better):

function lsTest(){
    var test = 'test';
    try {
        localStorage.setItem(test, test);
        return true;
    } catch(e) {
        return false;

if(lsTest() === true){
    // available
    // unavailable

It's not as concise as other methods but that's because it's designed to maximise compatibility.

The original source:

Working example:

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