How much can you put in local storage?

Is there a limit to local storage?

LocalStorage should be avoided because it is synchronous and will block the main thread. It is limited to about 5MB and can contain only strings. LocalStorage is not accessible from web workers or service workers. Cookies have their uses, but should not be used for storage.

What happens if LocalStorage is full?

The data is not stored and no existing data is overwritten.

Is it good to store data in local storage?

In summary, LocalStorage is a good and secure way to store publicly accessible, non-sensitive data that can be converted to a string, is less than 5 MB in size, should not be accessible by workers, and is not accessed often. Otherwise, other options should be considered.

Is it safe to store in local storage?

No. localStorage is accessible by any webpage, and if you have the key, you can change whatever data you want. That being said, if you can devise a way to safely encrypt the keys, it doesn't matter how you transfer the data, if you can contain the data within a closure, then the data is (somewhat) safe.