Deploy your FastAPI app to Replit Deployments
Step-by-step deployment help for FastAPI apps on Replit Deployments. We fix FastAPI-specific deployment issues, configure Replit Deployments, and get your app live. From $19.
FastAPI issues we fix before deploying
Common FastAPI problems that affect Replit Deployments deployments.
Blocking calls inside async endpoints
Synchronous database calls, file operations, or HTTP requests inside async def endpoints block the entire event loop, making your API unresponsive under load.
Missing authentication on endpoints
API routes that handle sensitive data or actions without any auth middleware — Depends() for authentication is simply not included in the route definition.
No CORS configuration
CORSMiddleware either missing (blocking all cross-origin requests) or set to allow_origins=['*'] (allowing any website to call your API).
Pydantic models without validation constraints
Request models that accept any string length, any number range, and any format. No Field() constraints, so invalid data flows through your system.
Replit Deployments deployment issues we check for
Common Replit Deployments problems that break FastAPI apps in production.
Development server used in production
AI tools configure Replit to run the dev server (next dev, vite dev) in production instead of building and serving optimized output, wasting resources and exposing debug features.
Secrets exposed in .replit or replit.nix
API keys and database credentials end up in version-controlled configuration files instead of Replit's Secrets manager, visible to anyone who forks the project.
Reserved VM resources insufficient for workload
Replit's reserved VM allocations have fixed CPU and RAM limits. AI-generated apps with heavy processing or multiple services exceed these limits and get throttled.
Outbound networking blocked on free tier
Free Replit deployments restrict outbound network requests, breaking API calls to external services that AI-generated backends depend on.
Start with a self-serve audit
Get a professional review of your FastAPI project before deploying to Replit Deployments.
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 FastAPI app to Replit Deployments?
We handle FastAPI deployments to Replit Deployments end to end. Start with our code audit ($19) to identify deployment blockers specific to your FastAPI project, then we configure Replit Deployments, fix issues, and get your app live in production.
What FastAPI issues affect Replit Deployments deployments?
FastAPI projects commonly have blocking calls inside async endpoints and missing authentication on endpoints. On Replit Deployments, these combine with development server used in production and secrets exposed in .replit or replit.nix to cause deployment failures.
Can SpringCode deploy my FastAPI project to Replit Deployments?
Yes. We specialize in deploying FastAPI applications to Replit Deployments. We audit your codebase for FastAPI-specific issues, configure Replit Deployments correctly, and handle the full deployment so your app runs reliably in production.
What does FastAPI deployment to Replit Deployments cost?
Our code audit ($19) identifies all Replit Deployments deployment blockers in your FastAPI project. Full deployment assistance is scoped with a fixed quote after the audit — no hourly billing or surprise charges.
Related resources
Other techs on Replit Deployments
Deploy FastAPI elsewhere
Need help deploying FastAPI to Replit Deployments?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.