chrome.storage.local.get failed?

[Jean Lomdes]

Hi,

Is it possible that reading a local stored value fails in this example ?

At install time, I am setting value in "somekey".

await chrome.storage.local.set({somekey: 'value'});

Then I use this value by getting it this way

let data = await chrome.storage.local.get(['somekey']);

data.somekey is sometimes undefined but I am pretty sure there is a value.

I did use try..catch around the get but nothing is thrown.

Is there a safer way to read this value?

Thank you,

Jean

[wOxxOm]

The usual culprits:

1. some other code deletes the value e.g. onInstalled event listener which triggers on extension reload;
2. the second code actually runs simultaneously with the first one e.g. setStorage(); useStorage(); instead of waiting e.g. setStorage().then(useStorage);
   note that the API doesn't guarantee the order in which the calls are processed!

[Jean Lomdes]

Thank you for your response. 

Did you experience a loss of storage value? Or is it guarantee that local storage is never lost?

Thank you,

Jean

[wOxxOm]

It is guaranteed, assuming the value does not exceed the limits, but bugs can happen. The default limit is 10MB as measured after JSON.stringify + UTF-8 encode, you can also specify "unlimitedStorage" permission to remove this limit, in which case it'll be limited by the internal API invocation message size limit, which is IIRC 64MB.