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Arjun Preetham
Arjun Preetham

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A Terminal Chat App to Understand Reconnects in Real-Time Systems

Most real-time examples focus on the happy path.

Messages flow. The UI updates. Everything looks fine.

But real systems fail in boring ways:
connections drop, clients reconnect, and suddenly you have to care about duplicates and state consistency.

To make this easier to reason about, I built a terminal-based chat application using Ink.

Why the terminal?

Because it strips away browser-specific complexity while still giving you a UI. There’s no React hydration, no hidden reconnection logic, no optimistic rendering masking what’s happening underneath.

You can actually see:

when a connection drops

when the client reconnects

that messages resume without duplication

In this example, the focus is reconnect handling.
When a client reconnects, the RelayX SDK handles duplicate messages internally, so the application logic stays simple.

The chat itself is intentionally basic. The goal isn’t features, it’s visibility into real-time behavior.

I documented the full example here, including the code and setup:
👉 https://docs.relay-x.io/examples/cli-chat-app/what-youre-building

If you’re building chat apps, dashboards, or anything event-driven, I’m curious how you’re handling reconnects today.

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