Next.js warns it inferred the wrong workspace root (multiple lockfiles)

Error

Warning: Next.js inferred your workspace root, but it may not be correct. We detected multiple lockfiles and selected the directory of <home>/package-lock.json as the root directory.

Fix

A stray package-lock.json in a parent folder (often your home directory) confuses Next's file tracing. Either delete the stray lockfile if nothing uses it, or pin the root in next.config.mjs: import path from 'node:path'; import { fileURLToPath } from 'node:url'; export default { outputFileTracingRoot: path.dirname(fileURLToPath(import.meta.url)) };

Related fixes