How to Fix DNS Resolution Error in Next.js

If you've encountered a DNS Resolution Error while working with Next.js, you're not alone. This is one of the most common issues developers face.

What Causes This Error

DNS resolution errors in Next.js occur when the runtime can't resolve a hostname to an IP address. This may be caused by misconfigured DNS servers, IPv6/IPv4 issues, network connectivity problems, or transient DNS cache failures.

The Fix

The key is to force IPv4-first DNS order and add abort timeouts to server-side fetches:

// next.config.js
module.exports = {
  experimental: {
    dns: { order: "ipv4first" },
  },
};

// In getServerSideProps or API route
const controller = new AbortController();
setTimeout(() => controller.abort(), 5000);
const res = await fetch(url, { signal: controller.signal });

Common Pitfall

A common mistake is to ignore this error during development because it only surfaces under specific conditions. Always test with production-like settings to catch these issues early. If you're working in a team, document this fix in your project's troubleshooting guide so others don't hit the same wall.

Verify the Fix

After applying the fix, restart your Next.js application and verify the error no longer appears in the console or logs. Test both the happy path and edge cases to be thorough. If the error persists, double-check that your changes were saved and the application fully restarted.

Prevention

Tools like [Bugsly](https://bugsly.dev) can catch these Next.js errors in real time, giving you stack traces and context to fix issues faster.