Building a marketplace with Next.js? Let us review it.
Expert code review for marketplace apps built with Next.js. We fix Next.js-specific security gaps, optimize performance, and handle deployment. From $19.
Common Next.js issues we find
Real problems from Next.js codebases we've reviewed.
Unprotected API routes
Next.js API routes and server actions without authentication checks, allowing anyone to call them directly.
Server action data exposure
Server actions that return sensitive data to the client or don't validate user permissions before modifying data.
Incorrect middleware configuration
Auth middleware that doesn't cover all protected routes, uses wrong matchers, or can be bypassed with URL manipulation.
Missing ISR/SSG configuration
Pages that should be statically generated are server-rendered on every request, causing unnecessary load and slower responses.
Marketplace challenges to solve
Key marketplace concerns that AI-generated code often misses.
Payment splitting and payouts
Buyers pay, the platform takes a cut, sellers receive the rest. This requires Stripe Connect or similar — significantly more complex than basic checkout. AI tools rarely implement this correctly, leaving you with manual payout processes.
Two-sided authorization
Sellers can manage their listings but not other sellers'. Buyers can view listings but only manage their own orders. Admins can moderate everything. Three distinct permission levels, all enforced server-side.
Trust and safety
Reviews, ratings, dispute resolution, content moderation, and fraud detection. These are complex systems that AI tools don't generate but that make or break a marketplace.
Search and discovery
Users need to find what they're looking for. Basic database queries won't cut it at scale — you need full-text search, filters, sorting, and potentially geolocation. This requires proper indexing or a dedicated search service.
What we check
Key areas we review for Next.js marketplace projects.
Payment flow — Stripe Connect setup, split payments, seller payouts
Authorization — buyer vs seller vs admin permissions enforced server-side
Data integrity — race conditions, inventory management, order state machines
Search performance — indexing, query optimization, full-text search
Not sure if your app passes? Our code audit ($19) checks all of these and more.
Start with a self-serve audit
Get a professional review of your Next.js marketplace 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.
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
Can you review a marketplace built with Next.js?
Yes. We regularly audit Next.js marketplace projects and understand the specific patterns and pitfalls of this combination. Our review covers security, performance, and deployment readiness.
What issues do you find in Next.js marketplace apps?
Common issues include unprotected api routes and server action data exposure on the Next.js side, combined with marketplace-specific concerns like payment splitting and payouts and two-sided authorization. We check for all of these and more.
How do I make my Next.js marketplace production-ready?
Start with our code audit ($19) to get a prioritized list of issues. For Next.js marketplace projects, the typical path is: fix security gaps, address marketplace-specific requirements, optimize Next.js performance, then configure deployment. We provide a fixed quote after the audit.
How long does it take to audit a Next.js marketplace?
Our code audit delivers a full report within 24 hours. For Next.js marketplace projects, we check security, architecture, performance, and deployment readiness across all Next.js-specific patterns. Fixes are scoped separately with a fixed quote.
Related resources
Next.js by Use Case
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