Check if localStorage is available

Question

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

Answer 1

I'd check that localStorage is defined prior to any action that depends on it:

if (typeof localStorage !== 'undefined') {
    var x = localStorage.getItem('mod');
} else {
    // localStorage not defined
}

UPDATE:

If you need to validate that the feature is there and that it is also not turned off, you have to use a safer approach. To be perfectly safe:

if (typeof localStorage !== 'undefined') {
    try {
        localStorage.setItem('feature_test', 'yes');
        if (localStorage.getItem('feature_test') === 'yes') {
            localStorage.removeItem('feature_test');
            // localStorage is enabled
        } else {
            // localStorage is disabled
        }
    } catch(e) {
        // localStorage is disabled
    }
} else {
    // localStorage is not available
}

Answer 2

Here is an easy check:

if(typeof localStorage === 'undefined'){