indexedDB is too low level for that kind of thing by itself. It's just a fast Key-Value store with secondary indexes that's in your browser. You either need to

indexedDB is too low level for that kind of thing by itself. It's just a fast Key-Value store with secondary indexes that's in your browser. You either need to find a solution that has a sync system built in (such as <https://dexie.org/ https://dexie.org/> or <https://pouchdb.com/ https://pouchdb.com/> ) or you'd roll your own atop whatever you were using.