Can I increase QUOTA_BYTES_PER_ITEM in Chrome?

Question

Is there any way to increase the chrome.storage.sync.QUOTA_BYTES_PER_ITEM ?

For me, the default 4096 Bytes is a little bit short.

I tried to execute

chrome.storage.sync.QUOTA_BYTES_PER_ITEM = 8192;

However, it seems that the actual limit doesn't change.

How can I do this?

Answer 1

No, QUOTA_BYTES_PER_ITEM is there for reference only; it is not a settable value. You could use the value of QUOTA_BYTES_PER_ITEM to split an item up into multiple items, though:

function syncStore(key, objectToStore, callback) {
    var jsonstr = JSON.stringify(objectToStore);
    var i = 0;
    var storageObj = {};

    // split jsonstr into chunks and store them in an object indexed by `key_i`
    while(jsonstr.length > 0) {
        var index = key + "_" + i++;

        // since the key uses up some per-item quota, see how much is left for the value
        // also trim off 2 for quotes added by storage-time `stringify`
        var valueLength = chrome.storage.sync.QUOTA_BYTES_PER_ITEM - index.length - 2;

        // trim down segment so it will be small enough even when run through `JSON.stringify` again at storage time
        var segment = jsonstr.substr(0, valueLength);           
        while(JSON.stringify(segment).length > valueLength)
            segment = jsonstr.substr(0, --valueLength);

        storageObj[index] = segment;
        jsonstr = jsonstr.substr(valueLength);
    }

    // store all the chunks
    chrome.storage.sync.set(storageObj, callback);
}

Then write an analogous fetch function that fetches by key and glues the object back together.