Is there a way to find the maximum size of localStorage for Chrome Extension

Question

I'm writing a Google Chrome extension. I know that Chrome currently sets the limit of 5MB on the maximum allowed size of localStorage. But I'm curious if there's any way to get this from the Chrome itself, anything like a JS constant/global variable?

PS. I just hate to hard-code this value in case they change it in the future.

http://stackoverflow.com/questions/4391575/how-to-find-the-size-of-localstorage — charlietfl, Sep 13 '14 at 03:38
@charlietfl: I'm sorry, but how does that answer my question? — c00000fd, Sep 13 '14 at 03:45
follow the links, there are examples of how to load to fail point, and explanations that there is no sort of `getSize()` method — charlietfl, Sep 13 '14 at 03:48
@charlietfl: That is a very cumbersome method of finding it out, plus it may take a lot of time and resource usage on the client system. — c00000fd, Sep 13 '14 at 03:51
don't shoot the messenger, just pointing out resources for you — charlietfl, Sep 13 '14 at 03:52
@charlietfl: Thanks. I found that page too. I was just hoping for a more elegant solution. — c00000fd, Sep 13 '14 at 04:03
actually a bit surprised there isn't a clean simple API approach myself — charlietfl, Sep 13 '14 at 04:04
@ZigMandel: Can I do this for an extension. Any code examples? — c00000fd, Sep 15 '14 at 18:14

score 0 · Answer 1 · edited Jun 22 '19 at 14:08

We assume that one character equals one byte, but this is not a safe assumption. Strings in JavaScript are UTF-16, so each character requires two bytes of memory. This means that while many browsers have a 5 MB limit, you can only store 2.5 M characters.

It is quite difficult to predict how much is left for the domain, even if it is set to 5 MB.

After reading through about HTML5 Storage. It is quite possible to look for unlimited storage option.

https://developers.google.com/chrome/whitepapers/storage#unlimited

In this documentation they are suggesting manifest as:

 "storage": {
    "managed_schema": "schema.json"
  },

I have not tested myself but it is worth to give it a try. If it works then please let me know as well.

score 0 · Answer 2 · answered Mar 21 '21 at 03:27

0

Updated 2021: https://developer.chrome.com/docs/extensions/reference/storage/#property-local

Use chrome.storage.local.QUOTA_BYTES.

answered Mar 21 '21 at 03:27

Jess Uni

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Is there a way to find the maximum size of localStorage for Chrome Extension

2 Answers2