Expert NestJS Code Review for AI-Built Apps
NestJS is a TypeScript-first backend framework built for enterprise Node.js applications. AI tools generate NestJS projects with decorators and modules, but frequently misconfigure dependency injection, guards, and middleware.
Common NestJS issues we find
Real problems from NestJS codebases we've reviewed.
Missing authentication guards
Controllers and routes without @UseGuards decorators, leaving endpoints publicly accessible without any auth checks.
Incorrect dependency injection scope
Services registered with wrong scope (default singleton vs request-scoped) causing shared state between requests and data leakage between users.
Unvalidated DTOs
Data Transfer Objects without class-validator decorators or missing the global ValidationPipe, accepting any shape of input data.
Circular dependency issues
Modules importing each other in cycles, causing runtime errors or undefined injections that only surface in production.
Missing exception filters
No global or controller-level exception filters, leaking internal stack traces and database errors to API consumers.
Inefficient module structure
Everything in a single module or deeply nested modules with improper exports, making the app hard to test and slow to bootstrap.
NestJS production checklist
Key checks before deploying your NestJS app.
AuthGuard applied to all protected routes
Global ValidationPipe enabled with whitelist and forbidNonWhitelisted
DTOs have class-validator decorators on every property
Exception filters configured to hide internal errors
Proper module boundaries with explicit exports
Health check endpoint via @nestjs/terminus
CORS configured for specific origins
Swagger/OpenAPI documentation generated
Not sure if your app passes? Our code audit ($19) checks all of these and more.
Our NestJS services
Security Review
Deep security analysis of your application — from API endpoints to database access.
Deploy & Ship
From local development to production deployment.
Refactor Code
Clean up messy, duplicated, and hard-to-maintain code without breaking what already works.
Testing
Add test coverage to your AI-generated app so you can ship changes with confidence.
AI tools that generate NestJS code
Start with a self-serve audit
Get a professional review of your NestJS project at a fixed price.
Security Scan
Black-box review of your public-facing app. No code access needed.
- OWASP Top 10 checks
- SSL/TLS analysis
- Security headers
- Expert review within 24h
Code Audit
In-depth review of your source code for security, quality, and best practices.
- Security vulnerabilities
- Code quality review
- Dependency audit
- AI pattern 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.
Get a clear plan
We respond in 24 hours with scope, timeline, and cost.
Launch with confidence
We fix what needs fixing and stick around to help.
Frequently asked questions
Is NestJS overkill for my app?
NestJS adds structure that pays off as your app grows. If your AI tool generated it, the framework is already in place — the key is making sure guards, validation, and modules are configured correctly rather than switching to something simpler.
How do you review NestJS code?
We audit guard coverage on every route, validate DTO decorators, check dependency injection scopes, review module boundaries, and ensure exception filters don't leak internal details.
Can you fix my NestJS dependency injection issues?
Yes. Circular dependencies, incorrect scopes, and missing providers are common in AI-generated NestJS apps. We restructure modules and fix injection graphs to eliminate runtime errors.
Related resources
Need help with your NestJS project?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.