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Security & Code Audit for Next.js Projects

CodeAudit.dev checks your Next.js codebase for the vulnerabilities, performance issues, and architecture problems most common to Next.js applications.

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Common Next.js Issues

01
Exposed environment variables in client bundles
02
Missing middleware on API routes
03
Unoptimized images causing performance degradation
04
Server actions without proper authorization and validation
05
getServerSideProps leaking sensitive data to the client
06
Insecure CORS configurations
07
Vulnerable dependencies inflating the build size

Example Finding

[Critical]

Exposed API Secret in Client Bundle

An API key meant for server-side use was found prefixed with NEXT_PUBLIC_, making it accessible in the browser. Attackers can extract this key and misuse your API.

Fix:Remove the NEXT_PUBLIC_ prefix, move the key usage to a server-side route or server action, and rotate the exposed secret immediately.

Why Next.js Projects Need Specialized Checks

Next.js blurs the line between frontend and backend. Features like Server Actions, middleware, and SSR make it powerful but also introduce unique attack vectors. It's incredibly easy to accidentally leak server-side secrets to the client bundle or misconfigure API route protections. CodeAudit specifically looks for these Next.js-specific patterns to ensure your full-stack application remains secure and performant.

Frequently Asked Questions

Does CodeAudit check my Next.js Server Actions?

Yes. We analyze Server Actions for proper input validation, authorization checks, and potential data leakage.

Can you detect bloated client bundles?

Absolutely. We identify oversized packages and components that should be dynamically imported or server-rendered to improve your Core Web Vitals.

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