10 Mistakes Developers Make When Deploying with Vercel

Deploying your project can be a daunting task, especially with a platform like Vercel that offers numerous features and capabilities. As a developer, it’s easy to make mistakes that can lead to downtime, unexpected costs, or even a poor user experience. In 2026, after multiple deployments ourselves, we’ve seen firsthand the common pitfalls that many developers face. Here are the ten mistakes you should avoid when deploying with Vercel.

1. Ignoring Environment Variables

What It Actually Means

Environment variables are crucial for securing sensitive information like API keys and database URLs.

Mistake:

Many developers forget to set these variables in the Vercel dashboard, which can lead to broken functionality in production.

Our Take:

We always double-check our environment settings before hitting deploy.

2. Not Utilizing Preview Deployments

What It Actually Means

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

Mistake:

Skipping this feature can result in unexpected bugs or layout issues when changes are finally made live.

Our Take:

We make it a habit to review preview deployments thoroughly, especially for major updates.

3. Overlooking Build Caching

What It Actually Means

Vercel caches builds to speed up deployments.

Mistake:

Some developers don’t utilize caching properly, leading to longer deployment times and potential inconsistencies.

Our Take:

We’ve seen a significant speed boost by leveraging build caching effectively.

4. Failing to Configure Custom Domains Correctly

What It Actually Means

Setting up custom domains is a straightforward process, but it requires attention to detail.

Mistake:

Not configuring DNS records properly can lead to downtime or misdirected traffic.

Our Take:

We always double-check our DNS settings and make sure they’re propagated before going live.

5. Not Monitoring Performance Metrics

What It Actually Means

Vercel provides performance metrics to help you understand how your app is performing.

Mistake:

Ignoring these metrics can lead to missed opportunities for optimization.

Our Take:

We track our metrics closely and use them to inform future development efforts.

6. Overreliance on Automatic Deployments

What It Actually Means

Vercel allows for automatic deployments from Git.

Mistake:

While convenient, relying solely on this feature can lead to unexpected issues if you don’t test code locally first.

Our Take:

We prefer to run tests locally before pushing to avoid surprises.

7. Lack of Version Control

What It Actually Means

Version control systems like Git help manage changes to your codebase.

Mistake:

Developers sometimes deploy directly without committing changes to a version control system, risking loss of work.

Our Take:

We always commit our changes before deploying to keep a clean history.

8. Not Using Serverless Functions Wisely

What It Actually Means

Vercel allows for serverless functions, which can handle backend processes.

Mistake:

Failing to optimize these functions can lead to increased costs and slower performance.

Our Take:

We keep our functions lightweight and efficient to reduce costs and improve speed.

9. Ignoring Accessibility Standards

What It Actually Means

Ensuring your web app is accessible is crucial for user experience.

Mistake:

Some developers overlook accessibility features, leading to a poor experience for users with disabilities.

Our Take:

We actively test for accessibility issues and prioritize them in our development process.

10. Not Backing Up Your Data

What It Actually Means

Data backups are essential for recovery in case of failures.

Mistake:

Some developers forget to back up their databases or files, leading to potential data loss.

Our Take:

We implement regular backups to ensure our data is safe.

Conclusion: Start Here

To avoid these common pitfalls, take the time to review your deployment process before launching on Vercel. Focus on setting up environment variables, utilizing preview deployments, and monitoring performance metrics. By doing so, you’ll save yourself a lot of headaches down the line.

If you’re just starting out with Vercel, consider spending a few hours familiarizing yourself with its features and best practices. This investment will pay off in smoother deployments and a better user experience.