How to debug real-time not working in Supabase?

 

Step 1: Verify Project Configuration

Ensure your Supabase project is correctly set up. Log into your Supabase dashboard and check that the database is running and tables exist. Double-check the API keys (anon and service roles), and ensure they are correctly applied in your application.

 

Step 2: Check Client-side Setup

Ensure that your client-side code correctly initializes the Supabase client. Here's a snippet on how to properly set up the Supabase client using the provided API keys and URL:

import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'https://YOUR_SUPABASE_URL.supabase.co';
const supabaseAnonKey = 'YOUR_ANON_KEY';

const supabase = createClient(supabaseUrl, supabaseAnonKey);

Verify that these values are correct and correspond to your project settings.

 

Step 3: Test Basic Database Connection

Before debugging the real-time issue, ensure your basic Supabase setup is functioning. Try querying some data:

async function fetchData() {
  const { data, error } = await supabase
    .from('your_table_name')
    .select('\*');

  if (error) console.error('Error fetching data:', error);
  else console.log('Data:', data);
}

fetchData();

This will confirm whether your client-side setup can interact with your Supabase backend.

 

Step 4: Set Up Real-time Listener

Implement a basic real-time subscription to verify its configuration. Here is an example of how to listen for changes:

const subscription = supabase
  .from('your_table_name')
  .on('\*', (payload) => {
    console.log('Change received!', payload);
  })
  .subscribe();

Make sure your table name and event settings are correct.

 

Step 5: Check Network Configuration

Real-time updates in Supabase rely on WebSockets. Ensure that your network allows WebSocket connections and check the browser's developer tools for any blocked connections or failed WebSocket handshakes.

 

Step 6: Review CORS Settings

Ensure your application’s origin is correctly set in Supabase's API settings. Misconfigured CORS settings can prevent real-time updates from reaching your application. Adjust your CORS settings in the Supabase dashboard if needed.

 

Step 7: Inspect WebSocket Connections

Use the browser's developer tools to examine WebSocket connections. Check for any errors or disconnections. All WebSocket communications should be properly authenticated.

 

Step 8: Inspect Permission Settings

Real-time requires the correct permissions. Check Supabase's Row Level Security (RLS) policies to ensure they allow real-time subscriptions for intended operations. Adjust policies to permit allowed operations.

 

Step 9: Enable Debugging Information

Enable verbose logging on the Supabase client to acquire more details about the internal processes. This assists in identifying specific fail points in your real-time setup:

const supabase = createClient(supabaseUrl, supabaseAnonKey, {
  realtime: {
    logger: console.log.bind(console),
  },
});

Review the console for logs related to your real-time subscriptions.

 

Step 10: Validate Real-time Expansion and Triggers

Ensure that any associated database changes are setup to trigger real-time updates. Verify your table has any necessary triggers and extensions enabled to support real-time capabilities.

 

Step 11: Test with Another Environment

If the real-time updates still aren’t working, try replicating the environment in a separate project, if possible. This can help determine if the issue is with your specific setup or a broader configuration error.

 

Step 12: Contact Support or Community

If all else fails, approach Supabase support or community forums for assistance. Provide detailed information about your configurations, errors, and logs to get more specific guidance.