Deploy your Svelte app to Fly.io
Step-by-step deployment help for Svelte apps on Fly.io. We fix Svelte-specific deployment issues, configure Fly.io, and get your app live. From $19.
Svelte issues we fix before deploying
Common Svelte problems that affect Fly.io deployments.
Unprotected SvelteKit server routes
SvelteKit +server.ts endpoints without authentication checks. Since these look like regular files in the routes folder, AI tools often forget they're publicly accessible API endpoints.
Sensitive data in load functions
Server load functions returning sensitive data that gets serialized to the client. Everything returned from +page.server.ts load is visible in the page's HTML source.
Store subscriptions causing memory leaks
Manual store subscriptions ($: syntax works in components, but manual subscribe() calls in modules need explicit unsubscribe to avoid memory leaks).
Missing form validation
SvelteKit form actions that process submitted data without validating fields, types, or sizes — trusting whatever the user sends.
Fly.io deployment issues we check for
Common Fly.io problems that break Svelte apps in production.
Dockerfile missing or misconfigured
Fly.io requires a Dockerfile for deployment. AI tools that scaffold without one force flyctl to auto-generate a suboptimal Dockerfile that misses build steps.
Volume only available in a single region
Fly volumes are pinned to one region. Multi-region deployments try to access a volume that doesn't exist in other regions, causing crashes.
Machine restarts losing in-memory state
AI-generated apps store session data or caches in memory. Fly machines can restart or migrate, wiping all in-memory state without warning.
Internal DNS resolution failing between services
Services within a Fly organization communicate via <app>.internal hostnames, but AI-generated code hardcodes localhost or public URLs.
Start with a self-serve audit
Get a professional review of your Svelte project before deploying to Fly.io.
External Security Scan
Black-box review of your public-facing app. No code access needed.
- OWASP Top 10 vulnerability check
- SSL/TLS configuration analysis
- Security header assessment
- Expert review within 24h
Code Audit
In-depth review of your source code for security, quality, and best practices.
- Security vulnerability analysis
- Code quality review
- Dependency audit
- Architecture review
- Expert + AI code analysis
Complete Bundle
Both scans in one package with cross-referenced findings.
- Everything in both products
- Cross-referenced findings
- Unified action plan
100% credited toward any paid service. Start with an audit, then let us fix what we find.
How it works
Tell us about your app
Share your project details and what you need help with.
Expert + AI audit
A human expert assisted by AI reviews your code within 24 hours.
Launch with confidence
We fix what needs fixing and stick around to help.
Frequently asked questions
How do I deploy a Svelte app to Fly.io?
We handle Svelte deployments to Fly.io end to end. Start with our code audit ($19) to identify deployment blockers specific to your Svelte project, then we configure Fly.io, fix issues, and get your app live in production.
What Svelte issues affect Fly.io deployments?
Svelte projects commonly have unprotected sveltekit server routes and sensitive data in load functions. On Fly.io, these combine with dockerfile missing or misconfigured and volume only available in a single region to cause deployment failures.
Can SpringCode deploy my Svelte project to Fly.io?
Yes. We specialize in deploying Svelte applications to Fly.io. We audit your codebase for Svelte-specific issues, configure Fly.io correctly, and handle the full deployment so your app runs reliably in production.
What does Svelte deployment to Fly.io cost?
Our code audit ($19) identifies all Fly.io deployment blockers in your Svelte project. Full deployment assistance is scoped with a fixed quote after the audit — no hourly billing or surprise charges.
Related resources
Other techs on Fly.io
Deploy Svelte elsewhere
Need help deploying Svelte to Fly.io?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.