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Supabase Backend as a Service · Lesson

Building a Live Chat Feature

Apply realtime knowledge to create a practical live chat application, demonstrating instant message delivery.

Realtime Chat: The Foundation

Welcome to building a live chat! Instant messaging is a perfect example of where realtime capabilities shine.

Users expect their messages to appear instantly without refreshing. Supabase Realtime makes this surprisingly simple.

In this lesson, we'll connect the dots: sending messages to your database and instantly receiving new messages from others.

Designing Your Chat Messages Table

First, we need a place to store our chat messages. A simple table is all it takes!

We'll create a messages table with columns for the message text, who sent it, and when it was sent.

  • id: Primary Key, unique identifier.
  • text: The message content (type: TEXT).
  • user_id: Who sent the message (type: UUID, linked to auth.users).
  • created_at: When the message was sent (type: TIMESTAMPTZ, default to now()).

All lessons in this course

  1. Understanding Realtime Subscriptions
  2. Subscribing to Table Changes
  3. Building a Live Chat Feature
  4. Presence and Broadcast Channels
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