Is there a limit to the key length for localStorage?

Question

Is there any limit (up to the amount of local storage available) for the key when using localStorage?

i.e. can I do something like:

localStorage.setItem("pretend that this is a 1MB string", "whatever");

Peter O. · Accepted Answer · 2011-12-03 14:37:56Z

48

Yes, the limit is 5MB per domain. Your string can be as long as you want. The total usage must, however, be under 5 MB.

http://dev.w3.org/html5/webstorage/

http://www.stackoverflow.com/questions/2747285/html5-localstorage-restrictions-and-limits

edited Dec 3, 2011 at 14:37

Peter O.

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answered Dec 1, 2011 at 18:00

Aniket

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5 Comments

Craig Celeste Over a year ago

The OP was asking about the key length more than the total storage. Those links didn't particularly answer the question. Are you saying key length is infinite, so long as it doesn't exceed the total 5 MB?

Rob W Over a year ago

@ParchedSquid Just tested on IE9, Chromium 30, Firefox 25; the key can have any length, as long as the total size of the key+value pair falls within the boundaries of the storage (approx 5MB). Code used to test: localStorage.clear();localStorage.setItem(new Array(5e6).join(' '),'');localStorage.key(0).length;

Craig Celeste Over a year ago

I tested quickly in FF24 with the same result. Thanks for confirming.

paulvs Over a year ago

Tested in the UIWebView on iOS 8.1 (iPhone 4S) and the limit was ~2.6MB.

user14264568 Over a year ago

is it still only 5mb? 2024

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