Avoiding 5 Common Mistakes When Deploying with Vercel

Deploying your web applications with Vercel can be a smooth experience, but it’s easy to trip over some common pitfalls. As indie hackers and solo founders, we often juggle multiple responsibilities and can overlook crucial details that lead to deployment headaches. After deploying countless projects, we’ve learned that avoiding these mistakes can save you time and stress. Here are five common deployment mistakes to steer clear of in 2026.

1. Ignoring Environment Variables

What It Is:

Environment variables are crucial for configuring your app without hardcoding sensitive information.

The Mistake:

Many developers forget to set up the necessary environment variables in Vercel. This can lead to broken functionality or, worse, exposing sensitive data.

Our Take:

We’ve encountered issues where our apps crashed after deployment because API keys were missing. Always double-check your environment settings in the Vercel dashboard.

How to Avoid:

• Go to the Vercel dashboard.
• Navigate to your project settings.
• Under "Environment Variables," ensure all required variables are present.

2. Overlooking Build Settings

What It Is:

Build settings determine how your project compiles and runs on Vercel.

The Mistake:

Failing to configure build settings correctly can lead to deployment failures or suboptimal performance.

Our Take:

We once deployed a React app without specifying the correct output directory, which resulted in a 404 error on the live site.

How to Avoid:

• Specify your build command and output directory in the project settings.
• Test locally before deploying to catch any build issues.

3. Not Utilizing Preview Deployments

What It Is:

Preview deployments allow you to test changes in a live environment before pushing them to production.

The Mistake:

Skipping preview deployments can lead to unexpected bugs in your production environment.

Our Take:

We learned the hard way when a feature that worked in development broke after deployment. Now, we always use preview deployments to catch issues early.

How to Avoid:

• Enable preview deployments in your Vercel project settings.
• Review the build output and test the preview link thoroughly before going live.

4. Failing to Monitor Performance

What It Is:

Monitoring performance helps ensure your app runs smoothly and efficiently after deployment.

The Mistake:

Many developers neglect performance monitoring, leading to slow load times and user dissatisfaction.

Our Take:

After a major update, we noticed a significant drop in our app's performance. Using Vercel’s built-in analytics, we identified the bottlenecks quickly.

How to Avoid:

• Use Vercel’s analytics to track performance metrics.
• Set up alerts for performance issues so you can address them proactively.

5. Not Keeping Dependencies Updated

What It Is:

Keeping your project dependencies updated ensures that you benefit from the latest features and security patches.

The Mistake:

Ignoring dependency updates can introduce bugs or security vulnerabilities into your application.

Our Take:

We once deployed an app that used outdated libraries, which led to compatibility issues. Now, we use tools to automate dependency updates.

How to Avoid:

• Use tools like Dependabot or Renovate to keep your dependencies up-to-date.
• Regularly check for updates and test your application after each update cycle.

Conclusion: Start Here

To ensure a smooth deployment experience with Vercel, focus on setting up your environment variables, build settings, and preview deployments correctly. Monitor your app's performance and keep your dependencies updated to avoid future headaches. If you’re just starting, set aside a couple of hours to go through these steps to avoid common pitfalls.

What We Actually Use

In our stack, we primarily use Vercel for deploying our Next.js applications. We also rely on tools like Dependabot for managing dependencies and Sentry for performance monitoring.