ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Frameworks & web · #reflex
An architectural deep dive into how Reflex synchronizes Python server state with a React frontend using WebSocket deltas to minimize latency and payload size.
Learn how Reflex’s rx.Var and @rx.event enable automatic UI updates from pure Python, with a counter example, WebSocket verification, and notes on memory and mutation pitfalls.
Decide which Reflex state backend— in‑memory, SQLite, or Redis—fits your app’s durability, scalability, and complexity needs. A concise decision guide, comparison table, and hands‑on config example help you pick the right persistence strategy.
Learn how Reflex manages full-stack state using pure Python, eliminating the need for JavaScript glue code through centralized state and WebSocket synchronization.
Learn how to diagnose and fix UI lag and state synchronization issues in Reflex by analyzing WebSocket traffic and optimizing state serialization.
Reflex synchronizes frontend UI state with a backend Python State class through a persistent websocket connection managed by FastAPI and Next.js. Event handlers modify backend state, triggering delta serialization and transmission to the browser, where updates trigger reactive re-renders. The framework currently lacks a built-in configuration point to limit
When upgrading a Reflex application from a version that used in‑memory state to Reflex 0.5.0, the framework expects a SQLite database at the location previously used for state storage. The supplied reflex migrate-state command copies the existing in‑memory state into this new file, but the operation is not wrapped in a transaction. If the migration is halted
python
redis
sqlite