Developer shares fixes for five common Next.js errors and their root causes

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A Next.js developer has documented solutions to recurring errors encountered while building projects with the framework over several months. Key issues covered include the 'document is not defined' ReferenceError, which arises because Next.js renders pages server-side where browser APIs are unavailable, and can be resolved by moving such code into a useEffect hook. Hydration mismatches — caused by dynamic values like Date.now() or localStorage reads during rendering — are fixed by waiting until a component mounts before displaying client-specific content. Undefined environment variables typically stem from missing or misconfigured .env.local files, incorrect variable prefixes, or failing to restart the development server after changes. MongoDB connection errors and 'Module not found' issues are also addressed, with most fixes involving configuration checks such as verifying credentials, correcting import paths, and ensuring packages are properly installed.

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