Developer builds lightweight offline sync for browsers using IndexedDB without frameworks

A developer has shared a framework-free approach to offline data synchronization in the browser using a library called ctrodb, a zero-dependency, browser-based database. The setup allows apps like a notes tool to store and edit data locally while offline, then automatically sync changes to a server when connectivity is restored. The sync plugin hooks into write operations and maintains a change log, using timestamp fields to order changes and detect conflicts. Two server-side HTTP endpoints handle the sync process — one for pushing local changes and another for pulling remote updates using cursor-based pagination. Conflicts, accepted changes, and errors are each handled separately, giving developers control over resolution logic without being tied to a specific backend or protocol.