Deploy your Express app to Fly.io
Step-by-step deployment help for Express apps on Fly.io. We fix Express-specific deployment issues, configure Fly.io, and get your app live. From $19.
Express issues we fix before deploying
Common Express problems that affect Fly.io deployments.
No helmet middleware for security headers
Express apps without the helmet middleware are missing critical security headers like Content-Security-Policy, X-Content-Type-Options, and HSTS, leaving the app vulnerable to common web attacks.
Missing input validation and sanitization
Request body, query params, and URL params used directly without validation. No express-validator, zod, or joi — enabling injection attacks and unexpected crashes.
Unstructured error handling
No global error-handling middleware. Errors either crash the process, leak stack traces to clients, or get silently swallowed with no logging.
CORS set to allow all origins
The cors() middleware called with no options, defaulting to allowing requests from any website — a security risk for APIs that handle user data.
Fly.io deployment issues we check for
Common Fly.io problems that break Express 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 Express 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 Express app to Fly.io?
We handle Express deployments to Fly.io end to end. Start with our code audit ($19) to identify deployment blockers specific to your Express project, then we configure Fly.io, fix issues, and get your app live in production.
What Express issues affect Fly.io deployments?
Express projects commonly have no helmet middleware for security headers and missing input validation and sanitization. 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 Express project to Fly.io?
Yes. We specialize in deploying Express applications to Fly.io. We audit your codebase for Express-specific issues, configure Fly.io correctly, and handle the full deployment so your app runs reliably in production.
What does Express deployment to Fly.io cost?
Our code audit ($19) identifies all Fly.io deployment blockers in your Express 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 Express elsewhere
Need help deploying Express to Fly.io?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.