Realtime subscriptions are a powerful feature for creating dynamic applications, but like any technology, they can sometimes present challenges. This section will guide you through troubleshooting common issues you might encounter when working with Supabase realtime subscriptions, helping you get back to building awesome apps quickly.
- Subscription Not Receiving Updates: This is the most frequent issue. First, ensure your realtime client is properly initialized and connected. Check your network tab in your browser's developer tools for any WebSocket connection errors. Verify that the table you're subscribing to has the appropriate RLS (Row Level Security) policies applied and that the authenticated user has permission to read from that table.
const { data, error } = await supabase.from('your_table_name').on('*', payload => {
console.log('Change received!', payload);
}).subscribe();
if (error) {
console.error('Subscription error:', error);
}- Incorrect Payload Data:
Sometimes, the data you receive in your subscription payload might not be what you expect. The
payloadobject typically containsnew,old, andcolumnsproperties, along witheventtype. Ensure you are accessing the correct properties for the operation (e.g.,payload.newfor an 'INSERT' or 'UPDATE',payload.oldfor a 'DELETE'). If you're filtering within your subscription (e.g., subscribing to specific rows), double-check your filter logic.
supabase.from('your_table_name').on('INSERT', payload => {
console.log('New row:', payload.new);
}).subscribe();
supabase.from('your_table_name').on('UPDATE', payload => {
console.log('Old row:', payload.old);
console.log('New row:', payload.new);
}).subscribe();
supabase.from('your_table_name').on('DELETE', payload => {
console.log('Deleted row:', payload.old);
}).subscribe();- Subscription Unsubscribing Unexpectedly: If your subscription stops working without you explicitly unsubscribing, it's often due to network interruptions or the server terminating the connection. Supabase clients usually have automatic reconnection mechanisms. However, if the issue persists, consider implementing manual reconnection logic or checking server logs for any specific reasons for disconnection.