platform

Next.js

15 verified traps, most recently checked first.

• next/image returns 400 '"url" parameter is not allowed' for a localhost or private-network image source

  "url" parameter is not allowed

  Next.js · verified 2026-10-15 · 0 confirmations

• Next.js 16 warns middleware is deprecated, and proxy.ts throws if you set runtime = 'edge'

  The "middleware" file convention is deprecated. Please use "proxy" instead.

  Next.js · verified 2026-10-15 · 0 confirmations

• NEXT_PUBLIC_ variable set at container runtime is ignored and the browser still sees the build-time value

  process.env.NEXT_PUBLIC_API_URL is undefined in the browser even though the container has it set

  Next.js · verified 2026-10-15 · 0 confirmations

• notFound() returns HTTP 200 instead of 404 when called inside a Suspense boundary or under loading.tsx

  curl -I on a missing record returns 200 OK while the page shows the not-found UI

  Next.js · verified 2026-10-15 · 0 confirmations

• params.id is undefined after upgrading to Next.js 16 because params and searchParams are Promises

  params.slug is undefined in a page that worked on Next.js 14

  Next.js · verified 2026-10-15 · 0 confirmations

• redirect() in a Server Action does nothing, or logs NEXT_REDIRECT, when it sits inside try/catch

  Error: NEXT_REDIRECT

  Next.js · verified 2026-10-15 · 0 confirmations

• With cacheComponents, dropdowns stay open and forms keep old values after navigating away and back

  A popover opened before navigation is still open on return

  Next.js · verified 2026-10-15 · 0 confirmations

• Build fails on Next.js 16 because a parallel route slot has no default.js

  Missing required default.js file for parallel route at app/@modal

  Next.js · verified 2026-10-15 · 0 confirmations

• Enabling cacheComponents breaks the build on export const dynamic, revalidate, fetchCache or dynamicParams

  Route segment config "dynamicParams" is not compatible with `nextConfig.cacheComponents`.

  Next.js · verified 2026-10-15 · 0 confirmations

• 'Failed to find Server Action' errors when Next.js runs on more than one container or after a deploy

  Error: Failed to find Server Action "7f3a...". This request might be from an older or newer deployment.

  Next.js · verified 2026-10-15 · 0 confirmations

• Build fails with 'encountered the unstable value crypto.randomUUID()' after enabling cacheComponents

  Route "/account": Next.js encountered the unstable value `crypto.randomUUID()` while prerendering.

  Next.js · verified 2026-10-15 · 0 confirmations

• File upload through a Server Action fails with 'Body exceeded 1 MB limit'

  Error: Body exceeded 1 MB limit.

  Next.js · verified 2026-10-15 · 0 confirmations

• generateStaticParams returning an empty array fails the build once cacheComponents is on

  Build error linking to /docs/messages/empty-generate-static-params

  Next.js · verified 2026-10-15 · 0 confirmations

• next build fails on Next.js 16 with 'This build is using Turbopack, with a webpack config and no turbopack config'

  This build is using Turbopack, with a `webpack` config and no `turbopack` config.

  Next.js · verified 2026-10-15 · 0 confirmations

• next/image quality prop is ignored on Next.js 16 and direct /_next/image?q=90 requests return 400

  An Image with quality={90} is served at q=75

  Next.js · verified 2026-10-15 · 0 confirmations

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