Does Supabase Work With Fly.io?
Supabase and Fly.io work together seamlessly—deploy your full-stack app on Fly.io while using Supabase's hosted PostgreSQL, auth, and realtime features.
Quick Facts
How Supabase Works With Fly.io
Supabase and Fly.io complement each other perfectly because they have zero architectural conflicts. You run your application (Node.js, Python, Go, etc.) on Fly.io's globally distributed servers, while Supabase provides a managed PostgreSQL database, authentication, and realtime subscriptions over the network. Your Fly.io app connects to Supabase via environment variables containing your connection string and API keys—no special configuration needed.
The developer experience is straightforward: initialize Supabase in your project, set up Fly secrets for your API URL and keys, and import the Supabase client in your app. Fly.io's multi-region deployment means your backend runs close to users, while Supabase's database remains in a single region (you choose during setup). This is ideal for latency-sensitive apps—your compute is distributed, and database queries are fast from any Fly region because Fly's network is optimized for cross-region communication.
One architectural note: if you need sub-millisecond database latency, consider running a read replica in the same Fly region as your primary app instances, but this is optional for most use cases. The realtime features work perfectly across regions since Fly maintains persistent WebSocket connections to Supabase.
Best Use Cases
Quick Setup
npm install @supabase/supabase-js expressimport { createClient } from '@supabase/supabase-js';
import express from 'express';
const app = express();
const supabase = createClient(
process.env.SUPABASE_URL!,
process.env.SUPABASE_ANON_KEY!
);
app.get('/api/posts', async (req, res) => {
const { data, error } = await supabase
.from('posts')
.select('*')
.limit(10);
if (error) return res.status(400).json({ error });
res.json(data);
});
app.listen(8080, () => console.log('Running on port 8080'));Known Issues & Gotchas
Database connection pooling—direct PostgreSQL connections from multiple Fly regions can exhaust Supabase's connection limits
Fix: Use Supabase's built-in connection pooler (PgBouncer) in transaction mode, or use Supabase's REST/GraphQL APIs instead of raw SQL clients for non-critical queries
Network latency between Fly and Supabase adds 50-200ms per request depending on regions
Fix: Use Supabase realtime for subscriptions instead of polling, cache frequently accessed data in Fly's memory, or batch requests
Supabase's free tier has limited database connections (2 concurrent) and slow response times
Fix: Upgrade to a paid plan if running production workloads, or use Supabase's caching headers with Fly's edge caching
Cross-origin requests from browser to Supabase require proper CORS configuration
Fix: Proxy API requests through your Fly app, or configure Supabase's CORS settings to allow your Fly domain
Alternatives
- •Firebase (Firestore) + Google Cloud Run—managed services but proprietary and more expensive at scale
- •PlanetScale (MySQL) + Railway—simpler setup but less features than Supabase (no built-in auth or realtime)
- •AWS RDS + Lambda + API Gateway—more control but steeper learning curve and higher operational overhead
Resources
Related Compatibility Guides
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