Latest fixes and solutions for nextjs errors on FixDevs.https://fixdevs.com/enSun, 29 Mar 2026 00:00:00 GMThttps://fixdevs.com/blog/clerk-not-working/https://fixdevs.com/blog/clerk-not-working/How to fix Clerk authentication issues — ClerkProvider setup, middleware configuration, useUser and useAuth hooks, server-side auth, webhook handling, and organization features.Sun, 29 Mar 2026 00:00:00 GMTreactnextjstypescriptsecuritydebuggingFixDevshttps://fixdevs.com/blog/contentlayer-not-working/https://fixdevs.com/blog/contentlayer-not-working/How to fix Contentlayer and Contentlayer2 issues — content source configuration, document type definitions, MDX processing, computed fields, Next.js integration, and migration to alternatives.Sun, 29 Mar 2026 00:00:00 GMTtypescriptnextjsdocumentationdebuggingFixDevshttps://fixdevs.com/blog/fumadocs-not-working/https://fixdevs.com/blog/fumadocs-not-working/How to fix Fumadocs documentation framework issues — Next.js App Router setup, content source configuration, sidebar generation, MDX components, search, OpenAPI integration, and custom themes.Sun, 29 Mar 2026 00:00:00 GMTreactnextjsdocumentationdebuggingFixDevshttps://fixdevs.com/blog/next-safe-action-not-working/https://fixdevs.com/blog/next-safe-action-not-working/How to fix next-safe-action issues — action client setup, Zod schema validation, useAction and useOptimisticAction hooks, middleware, error handling, and authorization patterns.Sun, 29 Mar 2026 00:00:00 GMTnextjstypescriptreactbackenddebuggingFixDevshttps://fixdevs.com/blog/nextra-not-working/https://fixdevs.com/blog/nextra-not-working/How to fix Nextra documentation site issues — Next.js integration, _meta.json sidebar configuration, custom MDX components, search setup, theme customization, and static export.Sun, 29 Mar 2026 00:00:00 GMTreactnextjsdocumentationdebuggingFixDevshttps://fixdevs.com/blog/nuqs-not-working/https://fixdevs.com/blog/nuqs-not-working/How to fix nuqs URL search params state management — useQueryState and useQueryStates setup, parsers, server-side access, shallow routing, history mode, and Next.js App Router integration.Sun, 29 Mar 2026 00:00:00 GMTreacttypescriptnextjsfrontenddebuggingFixDevshttps://fixdevs.com/blog/vercel-ai-sdk-not-working/https://fixdevs.com/blog/vercel-ai-sdk-not-working/How to fix Vercel AI SDK issues — useChat and useCompletion hooks, streaming responses with streamText, provider configuration for OpenAI and Anthropic, tool calling, and Next.js integration.Sun, 29 Mar 2026 00:00:00 GMTtypescriptreactnextjsaidebuggingFixDevshttps://fixdevs.com/blog/nextjs-auth-not-working/https://fixdevs.com/blog/nextjs-auth-not-working/How to fix NextAuth.js (Auth.js) issues — session undefined in server components, OAuth callback URL mismatch, JWT vs database sessions, middleware protection, and credentials provider.Thu, 26 Mar 2026 00:00:00 GMTnextjsreacttypescriptauthenticationdebuggingFixDevshttps://fixdevs.com/blog/nextjs-server-action-not-working/https://fixdevs.com/blog/nextjs-server-action-not-working/How to fix Next.js Server Actions — use server directive, form binding, revalidation, error handling, middleware conflicts, and client component limitations.Wed, 25 Mar 2026 00:00:00 GMTnextjsreacttypescriptfullstackdebuggingFixDevshttps://fixdevs.com/blog/nextjs-font-not-loading/https://fixdevs.com/blog/nextjs-font-not-loading/How to fix Next.js font loading issues — next/font/google setup, CSS variable approach, local fonts, font-display settings, FOUT flash, and Tailwind CSS font integration.Sun, 22 Mar 2026 00:00:00 GMTnextjscssfrontendperformancedebuggingFixDevshttps://fixdevs.com/blog/react-hydration-error/https://fixdevs.com/blog/react-hydration-error/How to fix React hydration errors — server/client HTML mismatches, useEffect for client-only code, suppressHydrationWarning, dynamic content, and Next.js specific hydration issues.Sat, 21 Mar 2026 00:00:00 GMTreactnextjsjavascripttypescriptfrontenddebuggingFixDevshttps://fixdevs.com/blog/nextjs-app-router-fetch-cache/https://fixdevs.com/blog/nextjs-app-router-fetch-cache/How to fix Next.js App Router fetch caching issues — understanding cache behavior, revalidation with next.revalidate, opting out with no-store, cache tags, and debugging stale data.Fri, 20 Mar 2026 00:00:00 GMTnextjsjavascripttypescriptdebuggingfrontendFixDevshttps://fixdevs.com/blog/react-server-components-error/https://fixdevs.com/blog/react-server-components-error/How to fix React Server Components errors — useState and hooks in server components, missing 'use client' directive, async component patterns, serialization errors, and client/server boundary mistakes.Fri, 20 Mar 2026 00:00:00 GMTreactnextjstypescriptdebuggingfrontendFixDevshttps://fixdevs.com/blog/nextjs-cors-error/https://fixdevs.com/blog/nextjs-cors-error/How to fix CORS errors in Next.js API routes — adding Access-Control headers, handling preflight OPTIONS requests, configuring next.config.js headers, and avoiding common proxy mistakes.Thu, 19 Mar 2026 00:00:00 GMTnextjsjavascripttypescriptdebuggingbackendFixDevshttps://fixdevs.com/blog/nextjs-middleware-not-running/https://fixdevs.com/blog/nextjs-middleware-not-running/How to fix Next.js middleware not executing — wrong file location, matcher config errors, middleware not intercepting API routes, and how to debug middleware execution in Next.js 13 and 14.Tue, 17 Mar 2026 00:00:00 GMTnextjsjavascripttypescriptdebuggingfrontendFixDevshttps://fixdevs.com/blog/nextjs-build-failed/https://fixdevs.com/blog/nextjs-build-failed/How to fix Next.js build failures — TypeScript errors blocking production builds, module resolution failures, missing environment variables, static generation errors, and common next build crash causes.Mon, 16 Mar 2026 00:00:00 GMTnextjstypescriptjavascriptdebuggingfrontendFixDevshttps://fixdevs.com/blog/nextjs-env-variables-not-working/https://fixdevs.com/blog/nextjs-env-variables-not-working/How to fix Next.js environment variables returning undefined — NEXT_PUBLIC prefix rules, server vs client context, .env file loading order, and runtime vs build-time variable access.Fri, 13 Mar 2026 00:00:00 GMTnextjsjavascriptenvironmentdebuggingFixDevshttps://fixdevs.com/blog/nextjs-500-internal-server-error/https://fixdevs.com/blog/nextjs-500-internal-server-error/How to fix the Next.js 500 Internal Server Error by checking server logs, fixing getServerSideProps, API routes, environment variables, database connections, middleware, and deployment issues.Mon, 09 Mar 2026 00:00:00 GMTnextjsreactdebuggingFixDevshttps://fixdevs.com/blog/nextjs-api-route-not-working/https://fixdevs.com/blog/nextjs-api-route-not-working/How to fix Next.js API route 404 not found errors caused by wrong file paths, App Router vs Pages Router confusion, incorrect exports, and deployment issues.Mon, 09 Mar 2026 00:00:00 GMTnextjsjavascriptdebuggingFixDevshttps://fixdevs.com/blog/nextjs-module-not-found-cant-resolve-fs/https://fixdevs.com/blog/nextjs-module-not-found-cant-resolve-fs/How to fix Next.js Module not found Can't resolve fs error caused by importing Node.js modules in client components, wrong server/client boundaries, and missing polyfills.Mon, 09 Mar 2026 00:00:00 GMTnextjsreactjavascriptFixDevshttps://fixdevs.com/blog/nextjs-image-optimization-error/https://fixdevs.com/blog/nextjs-image-optimization-error/How to fix Next.js Image component errors including 'Invalid src prop', 'hostname not configured', missing loader, and optimization failures in production.Thu, 12 Feb 2026 00:00:00 GMTnextjsreactjavascriptFixDevshttps://fixdevs.com/blog/react-useeffect-infinite-loop/https://fixdevs.com/blog/react-useeffect-infinite-loop/How to fix useEffect infinite loops in React — covers missing dependency arrays, referential equality, useCallback, unconditional setState, data fetching cleanup, event listeners, useRef, previous value comparison, and the exhaustive-deps lint rule.Fri, 23 Jan 2026 00:00:00 GMTreactjavascriptnextjsFixDevshttps://fixdevs.com/blog/nextjs-hydration-failed/https://fixdevs.com/blog/nextjs-hydration-failed/How to fix the Next.js hydration mismatch error. Covers invalid HTML nesting, browser extensions, Date/time differences, useEffect for client-only code, dynamic imports, suppressHydrationWarning, localStorage, third-party scripts, Math.random, auth state, and React portals.Sun, 11 Jan 2026 00:00:00 GMTnextjsreactjavascriptFixDevshttps://fixdevs.com/blog/loading-chunk-failed/https://fixdevs.com/blog/loading-chunk-failed/How to fix 'Loading chunk failed', 'ChunkLoadError', and 'Failed to fetch dynamically imported module' in webpack, Next.js, React, and Vite. Covers stale deployments, CDN caching, publicPath misconfiguration, service worker cache, code splitting, dynamic import retry strategies, React.lazy error boundaries, and Next.js-specific solutions.Fri, 26 Dec 2025 00:00:00 GMTwebpacknextjsreactvitejavascriptFixDevshttps://fixdevs.com/blog/err-connection-refused-localhost/https://fixdevs.com/blog/err-connection-refused-localhost/How to fix 'ERR_CONNECTION_REFUSED', 'localhost refused to connect', and 'This site can't be reached' errors when accessing localhost in Chrome, Firefox, and Edge. Covers dev servers, port issues, 0.0.0.0 vs 127.0.0.1, Docker port mapping, WSL2, firewalls, and more.Thu, 18 Dec 2025 00:00:00 GMTnetworkinglocalhostdockernodejsvitenextjsFixDevshttps://fixdevs.com/blog/env-variable-undefined/https://fixdevs.com/blog/env-variable-undefined/How to fix 'process.env.VARIABLE_NAME is undefined' and environment variables not loading from .env files in Node.js, React, Next.js, Vite, and Docker.Mon, 01 Dec 2025 00:00:00 GMTnodejsreactnextjsjavascriptdockerFixDevshttps://fixdevs.com/blog/port-3000-already-in-use/https://fixdevs.com/blog/port-3000-already-in-use/How to fix 'port 3000 is already in use', 'EADDRINUSE', and 'address already in use :::3000' errors in Node.js, React, Next.js, and other frameworks on macOS, Linux, and Windows.Sun, 30 Nov 2025 00:00:00 GMTnodejsreactnextjsnetworkingFixDevs