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Next.js Build Error Decoder
Paste the raw output of a failing next build or a stuck next dev. The decoder matches 13+ real failure signatures and tells you which one hit you, why, and the exact fix. Nothing you paste leaves your browser.
Runs entirely in your browser — nothing is uploaded.
Errors this decoder recognizes
Each signature comes from an error we have hit and documented — the diagnosis links to the deep-dive with reproduction steps and every variant of the fix.
useSearchParams() should be wrapped in a suspense boundaryread the fix →ChunkLoadError: Loading chunk failedread the fix →Dynamic server usage: couldn't be rendered staticallyread the fix →window is not definedread the fix →Module not found: Can't resolve …read the fix →JavaScript heap out of memoryread the fix →Hydration failed / text content does not matchread the fix →Dev server stuck on "compiling…"read the fix →EADDRINUSE: port 3000 already in useread the fix →process.env.X is undefinedread the fix →Cannot find module 'next/babel'read the fix →next/image hostname not configuredread the fix →next lint removed (Next.js 16)read the fix →Build passes but production is broken?
A green build is not a working app. Check your env variables with the Env Leak Checker and read the postmortem of a build that passed while production silently broke.
Read the postmortem