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Frameworks & web · #reflex
Reflex lets you build interactive web apps by treating UI state as plain Python attributes. Here is how its reactive variable system works, where it shines, and when you need an external store.
A practical guide to diagnosing Reflex computed vars that render stale data, covering assignment-based dirtiness, decorator selection, and WebSocket delta verification.
Learn how to implement @rx.event(background=True) in Reflex to handle long-running server tasks without blocking the UI, including state safety and failure modes.
Learn how to diagnose and fix state persistence failures in Reflex, including missing persist flags, JSON serialization errors, and browser local storage mismatches.
Reflex State supports on_mount and on_unmount lifecycle hooks for starting and cleaning up server-side work. Use them to avoid leaked timers and connections when users navigate away.
Explore the synchronization mechanism between Reflex's Python backend and React frontend, focusing on delta updates, state boundaries, and avoiding websocket congestion.
Learn how to diagnose and fix state synchronization issues in Reflex, from identifying key mismatches to configuring persistent backends and migrating deprecated decorators.
Learn how to manage server-side state in Reflex using rx.State, optimize performance with @rx.var, and handle long-running tasks with async generators.
Learn how to use Reflex State and @rx.var to build reactive UIs in pure Python, including the critical differences between base and computed variables.
python