Have you ever finished building a feature, tested it locally, and thought everything was working perfectly?
Then you deployed it… and suddenly something broke. 😅
I've experienced this kind of frustration while working with web applications.
When you're developing locally, everything seems fine. Your components render, your API calls work, and the application looks exactly how you expected.
But production is a different environment.
Here are three things I learned to check when a deployment doesn't go as planned.
1. Don't assume a successful local build means a successful deployment
Local development and production environments can behave differently.
A project might depend on environment variables, specific package versions, or configuration that exists on your machine but isn't available on the deployment platform.
Now, whenever something fails after deployment, I try to identify whether the problem is related to my code, configuration, or environment.
2. Read the build logs before changing the code
This is probably one of the most important lessons.
When an application fails to deploy, it's tempting to immediately start changing components or reinstalling packages.
But the actual error message might already explain the problem.
I try to look for:
- The first meaningful error in the build logs
- Missing environment variables
- Dependency or package version conflicts
- Errors related to server-side rendering
- Incorrect build or output configuration
The first error is often more useful than the many errors that appear afterward.
3. Debug production problems step by step
Instead of changing multiple things at once, I prefer to isolate the problem.
For example:
- Reproduce the issue locally if possible.
- Check the deployment logs.
- Verify environment variables and configuration.
- Fix one issue at a time.
- Deploy again and confirm the result.
This makes debugging easier and helps avoid introducing new problems while trying to fix the original one.
What I'm learning as a developer
The biggest lesson for me is that writing code is only one part of software development.
Understanding how an application is built, configured, deployed, and monitored is equally important.
I'm still learning, and every deployment issue gives me another opportunity to understand the process better.
Question for other developers:
What's the most confusing deployment issue you've faced with Next.js, React, or Node.js?
I'd love to hear your debugging stories and the lessons you learned from them.
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