Express app built with Replit Agent? Let’s review it.
Expert code review for Express apps built with Replit Agent. We find Replit Agent-specific bugs, fix Express security issues, and optimize performance. From $19.
Replit Agent issues we find in Express projects
Problems specific to Replit Agent's code generation patterns when building Express apps.
Secrets stored in Replit environment
API keys and credentials stored in Replit's secrets manager don't transfer when you export the project. Developers often hardcode them as a workaround, creating security risks.
No HTTPS or security headers
Replit's development environment doesn't enforce HTTPS or set security headers. Apps deployed without proper configuration are vulnerable to man-in-the-middle attacks.
Database connection instability
Replit's hosted databases can disconnect unexpectedly. Without connection pooling and retry logic, apps crash or lose data during these interruptions.
File system assumptions
Replit Agent sometimes writes to the file system assuming persistent storage, which breaks on containerized or serverless deployments.
Express issues we check for
Common Express problems that affect production readiness.
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.
Start with a self-serve audit
Get a professional review of your Replit Agent Express project at a fixed price.
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.
Frequently asked questions
Can you review Express code generated by Replit Agent?
Yes. We regularly audit Express projects built with Replit Agent and understand the specific patterns and issues it introduces. Our review covers security, performance, and deployment readiness.
What Express issues does Replit Agent typically create?
Common issues in Replit Agent-generated Express code include: secrets stored in replit environment, no https or security headers, database connection instability. Combined with Express-specific concerns like no helmet middleware for security headers and missing input validation and sanitization.
How do I make my Replit Agent Express project production-ready?
Start with our code audit ($19) to get a prioritized list of issues. For Replit Agent-built Express projects, the typical path is: fix security gaps, address Express-specific performance issues, then configure deployment. We provide a fixed quote after the audit.
How much does it cost to review Replit Agent-generated Express code?
Our code audit starts at $19 and covers security, performance, architecture, and deployment readiness. For fixes, our Fix & Ship plan is $199. Larger projects get a custom fixed quote — no hourly billing or surprises.
Related resources
Need help with your Replit Agent Express project?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.