nextjs-debug

Diagnose Next.js API routes, middleware, hydration, and component issues.

Updated Aug 27, 2026

Search Tags:#debugging #middleware #diagnostics #nextjs #hydration #server-components #api-routes

Ready to run

npx skills add https://github.com/emanuelrechsteiner/FairSplit --skill nextjs-debug

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Please help me install this Agent Skill.
Skill: nextjs-debug
Source: https://github.com/emanuelrechsteiner/FairSplit/tree/main/.claude/skills/nextjs-debug
Command: npx skills add https://github.com/emanuelrechsteiner/FairSplit --skill nextjs-debug

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Quickly diagnose and resolve Next.js issues across API routes, middleware, hydration, and server/client components.

Core Features & Use Cases

Comprehensive diagnostics for Next.js apps, including API route 404/405, middleware redirects, hydration mismatches, and server/client component problems.
Targeted fixes and guidance to apply actionable changes in your codebase.
Use cases span app router and pages router setups, development and production deployments.

Quick Start

Run the diagnostic against your Next.js project to identify and fix common issues.

Frequently Asked Questions about nextjs-debug

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I debug Next.js hydration mismatches and server/client component problems?▼

Debug Next.js hydration mismatches by running targeted shell-based diagnostics that inspect hydration behavior and client/server component usage, identifying root causes and actionable fixes across app router and pages router.

Why does my Next.js API route return a 404 or 405 error?▼

Next.js API route 404 or 405 errors are diagnosed by executing targeted diagnostic checks to inspect routes, identifying root causes across app router and pages router setups, and providing actionable fixes to resolve the routing configuration.

How do I troubleshoot Next.js middleware redirect issues?▼

Troubleshoot Next.js middleware redirect issues by running shell-based diagnostics to inspect middleware configuration, identifying the root cause of the redirect behavior and applying targeted fixes to your codebase.

Can I use Next.js diagnostics on both development and production deployments?▼

Yes, you can use Next.js diagnostics across both development and production deployments, as the diagnostic scope spans app router and pages router setups to identify and resolve API route, middleware, and hydration issues.

What is the best way to diagnose Next.js app router and pages router issues?▼

The best way to diagnose Next.js app router and pages router issues is to run targeted shell-based diagnostics that inspect routes, middleware configuration, hydration behavior, and component usage to identify actionable fixes.