Fix ConnectionError Error in Gatsby — When Deploying

What Is the ConnectionError Error?

Developers working with Gatsby often hit the ConnectionError error unexpectedly. Understanding why it occurs is the first step to fixing it.

Why It Happens

This error indicates a failed network connection — typically caused by incorrect URLs, DNS issues, or the server being unreachable. During deployment, this often surfaces due to missing environment variables or build config differences.

The Fix

async function fetchWithRetry(url, retries = 3) {
  for (let i = 0; i < retries; i++) {
    try {
      return await fetch(url);
    } catch (err) {
      if (i === retries - 1) throw err;
      await new Promise(r => setTimeout(r, 1000 * (i + 1)));
    }
  }
}

When This Error Appears in Production

If you encounter ConnectionError in a live Gatsby application, the first priority is understanding the blast radius — how many users are affected? Check your error monitoring dashboard for frequency and patterns. Often, this error correlates with specific user actions, browsers, or network conditions. Implementing graceful degradation ensures your application remains usable even when this error occurs. Consider adding a retry mechanism with exponential backoff for transient failures.

Prevention

[Bugsly](https://bugsly.dev) makes tracking errors like this effortless — real-time notifications with complete stack traces.

Key Takeaways

• Always handle this error gracefully with proper error handling
• Check your environment configuration — especially when deploying
• Test thoroughly before deploying to production