Expert tRPC Code Review for AI-Built Apps
tRPC enables end-to-end typesafe APIs between TypeScript frontends and backends. AI tools generate tRPC routers quickly, but input validation, middleware chains, and error handling are frequently incomplete or misconfigured.
Common tRPC issues we find
Real problems from tRPC codebases we've reviewed.
Missing input validation
tRPC procedures without Zod schemas on inputs, accepting any data shape and bypassing the type safety tRPC is designed to provide.
No authentication middleware
Protected procedures using publicProcedure instead of protectedProcedure, allowing unauthenticated access to sensitive operations.
Oversized response payloads
Procedures returning entire database records including sensitive fields instead of selecting only the data the client needs.
Missing error handling
Procedures that throw raw database or runtime errors to the client instead of using TRPCError with appropriate codes and safe messages.
Monolithic router file
All procedures defined in a single router file that grows unwieldy, making the codebase hard to maintain and test.
tRPC production checklist
Key checks before deploying your tRPC app.
All procedures have Zod input validation schemas
Protected procedures use auth middleware (not publicProcedure)
Response data filtered to exclude sensitive fields
Errors wrapped in TRPCError with appropriate codes
Router split into domain-specific sub-routers
Rate limiting middleware on sensitive procedures
Proper TypeScript inference (no manual type casting)
Not sure if your app passes? Our code audit ($19) checks all of these and more.
Our tRPC services
Security Review
Deep security analysis of your application — from API endpoints to database access.
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.
Add Features
New functionality, integrations, and capabilities that your AI tool couldn't build or that you need built properly.
AI tools that generate tRPC code
Start with a self-serve audit
Get a professional review of your tRPC 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
What is tRPC and why does my app use it?
tRPC lets your frontend call backend functions with full TypeScript type safety — no REST endpoints or GraphQL schemas needed. Your AI tool chose it because it's fast to set up. The key is making sure input validation and auth are properly configured.
How do you review tRPC code?
We check every procedure for input validation, auth middleware, error handling, and response data filtering. We also review the router structure and middleware chain for security gaps.
Can you add authentication to my tRPC API?
Yes. We create auth middleware, convert public procedures to protected ones, add session management, and ensure every sensitive operation verifies the user's identity.
Related resources
Need help with your tRPC project?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.