5 Common Mistakes When Using Vercel for Your First Deployment

Deploying your first application can feel like a monumental task, especially when using a platform like Vercel. I remember my first time—excited but nervous, I made so many rookie mistakes that I could have avoided with a little guidance. In 2026, Vercel has continued to be a popular choice for deploying serverless applications, but many newcomers still stumble on the same pitfalls. Here are five common mistakes to watch out for when deploying your first project on Vercel, along with how to avoid them.

1. Ignoring Environment Variables

What You Need to Know

Environment variables are crucial for managing sensitive information, such as API keys and database URLs.

Mistake

Many beginners forget to set up environment variables in Vercel, leading to failed builds or runtime errors.

How to Fix

• Go to your Vercel dashboard.
• Navigate to your project settings.
• Under the "Environment Variables" section, add your necessary variables.

Expected Output

Your application should now access the variables correctly, preventing any issues during deployment.

2. Not Optimizing Images

The Importance of Optimization

Images can significantly impact the performance of your app. Vercel does offer image optimization, but it's easy to overlook.

Mistake

Uploading large, unoptimized images can slow down your site's loading times, affecting user experience and SEO.

How to Optimize

• Use tools like TinyPNG or ImageOptim before uploading images.
• Consider using Vercel's Image Optimization feature, which automatically optimizes images on the fly.

Expected Output

Improved loading times and better performance scores on tools like Google PageSpeed Insights.

3. Using Default Build Settings

Customization Matters

Vercel provides sensible defaults, but they might not be suitable for your specific application.

Mistake

By sticking with default build settings, you may miss out on optimizations that could enhance your app's performance.

How to Customize

• In your Vercel project settings, adjust build commands based on your framework (like Next.js).
• Set up a vercel.json file for advanced configurations.

Expected Output

A build that is tailored to your specific needs, potentially improving performance and reducing deployment time.

4. Overlooking Serverless Function Limits

Understanding Limits

Vercel's serverless functions are a powerful feature, but they come with limitations regarding execution time and memory.

Mistake

New users often deploy functions without understanding these limits, leading to timeouts and errors.

How to Manage

• Keep your functions lightweight and focused on specific tasks.
• If you need more processing power, consider a different solution, like AWS Lambda.

Expected Output

Serverless functions that run smoothly without timing out or exceeding memory limits.

5. Not Monitoring Performance

Importance of Monitoring

After deployment, it's essential to monitor your application's performance to catch issues early.

Mistake

Many beginners deploy their apps and forget about them, leading to undetected performance issues.

How to Monitor

• Use Vercel Analytics to track performance metrics.
• Integrate tools like Sentry for error tracking.

Expected Output

A well-performing application with minimized downtime and improved user experience.

Conclusion: Start Here

If you're new to Vercel, avoid these common mistakes to ensure a smoother deployment experience. Start by setting up your environment variables and optimizing your images. Customize your build settings, keep your serverless functions efficient, and always monitor your application's performance.

To get started, pick up the basics from Vercel's documentation and follow these tips for a successful deployment.

What We Actually Use

In our experience, we rely heavily on Vercel's built-in image optimization and monitoring tools. We also use Sentry for error tracking, which has saved us countless headaches.