5 Common Mistakes When Using Vercel and How to Avoid Them

If you’re building a web application, you’ve probably heard about Vercel. It’s a popular choice for deploying modern front-end applications, especially those built with frameworks like Next.js. However, like any tool, it's easy to fall into some common traps that can lead to deployment errors and performance issues. In this guide, I’ll share five mistakes we’ve encountered while using Vercel and practical tips to avoid them.

1. Ignoring Build Caching

What Happens

When you deploy your application on Vercel, it caches your builds to speed up future deployments. However, if you don’t understand how caching works, you might end up serving stale content or missing important updates.

How to Avoid It

• Use Vercel's Cache Control Headers: Set proper cache control headers in your application to manage how long resources are cached.
• Clear the Cache When Necessary: If you notice outdated content, clear the cache from the Vercel dashboard before redeploying.

Expected Output

You’ll see that your deployments are faster and your users get the most current version of your app.

2. Not Configuring Environment Variables Properly

What Happens

Environment variables are crucial for managing configurations between development and production. Mistakes here can lead to broken features or security vulnerabilities.

How to Avoid It

• Set Variables in the Vercel Dashboard: Always configure your environment variables directly in the Vercel dashboard and avoid hardcoding them in your codebase.
• Use the Right Scope: Make sure to set variables for the correct scope (development, preview, or production).

Troubleshooting

If your app is crashing or features aren't working, double-check your environment variable settings.

3. Overlooking Performance Optimization

What Happens

Vercel is optimized for performance, but if you don't leverage its features, your app might be slower than it could be.

How to Avoid It

• Enable Image Optimization: Use Vercel's built-in image optimization features to serve images in the best format and size.
• Leverage Incremental Static Regeneration (ISR): This allows you to update static pages without rebuilding the entire site.

Expected Output

Your application will load faster, improving user experience and SEO.

4. Mismanaging Serverless Functions

What Happens

Vercel supports serverless functions, but improper use can lead to issues like cold starts or hitting execution time limits.

How to Avoid It

• Keep Functions Lightweight: Aim to do minimal work in your functions. Use them for quick tasks, and offload heavy processing elsewhere.
• Monitor Execution Time: Keep an eye on how long your functions take to execute. If they’re consistently slow, consider optimizing the logic or using a different service for heavy lifting.

Limitations

Remember that serverless functions have execution time limits (up to 10 seconds for Vercel). If your function consistently hits this limit, it may be time to rethink your architecture.

5. Neglecting Custom Domains and SSL Configurations

What Happens

Using custom domains on Vercel is straightforward, but misconfiguration can lead to downtime or security warnings.

How to Avoid It

• Follow Vercel’s Domain Setup Guide: Ensure you set up your custom domain properly by following Vercel's documentation.
• Check SSL Certificates: Vercel automatically provides SSL certificates, but verify that your domain is correctly pointing to Vercel to avoid certificate issues.

Expected Output

Your custom domain will be live with SSL, providing a secure experience for your users.

Conclusion: Start Here to Maximize Your Vercel Experience

Avoiding these common mistakes can save you a lot of headaches and improve your app's performance on Vercel. If you're starting out, focus on proper caching, environment variable management, and leveraging performance features right from the get-go.

For a streamlined deployment experience, we recommend checking out Vercel's documentation alongside our insights. This will help you grasp the nuances and maximize your use of the platform.