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Next.js configuration contains invalid options

Invalid `next.config.js`

Next.js detected invalid configuration keys or values in next.config.js, often because of typos, removed options, or values of the wrong type.

Invalid next.config.jsconfiguration

Observed message

Invalid `next.config.js`

Why it happens

  • A config field name is misspelled or no longer supported.
  • A configuration option is set to the wrong type.
  • The project still uses legacy options that were removed or renamed in newer versions of Next.js.

How to fix it

  1. Type the config as NextConfig or migrate to next.config.ts for better validation.
  2. Compare the current config against the official next.config.js reference.
  3. Remove deprecated keys such as old eslint or experimental.turbo configuration where required.

Official reference

Next.js Docs: Invalid `next.config.js`

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Invalid next.config.js in Next.js: how to fix configuration errors | Error Atlas