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Website Not Working Properly? 7 Common Bugs That Can Cost Your Business Customers

A website can look perfect on the surface and still have serious technical problems behind it.

A broken login, slow API, failed deployment, mobile layout issue, or database error can cause customers to leave your website and affect your business.

The good news is that most website problems can be identified and fixed without rebuilding the entire application.

1. Website Is Showing Errors

Common examples:

• 404 errors
• 500 server errors
• Blank pages
• JavaScript errors
• API connection failures
• Authentication errors

The first step is to check browser console errors, server logs, API responses and deployment configuration.

A developer can identify whether the problem is coming from the frontend, backend, database or server.

2. API Is Not Working

Your frontend may be working correctly, but the API may return errors such as:

401 Unauthorized
403 Forbidden
404 Not Found
500 Internal Server Error

Common causes include:

• Incorrect API URL
• Authentication/token problems
• CORS configuration
• Backend exceptions
• Incorrect request data
• Database connection problems

Proper API debugging helps identify the actual root cause instead of repeatedly changing frontend code.

3. Website Is Too Slow

A slow website can happen because of:

• Large images
• Unoptimized JavaScript
• Slow database queries
• Too many API requests
• Poor caching
• Slow server response
• Unoptimized backend code

Performance optimization can include API optimization, database query improvements, caching, image optimization and frontend improvements.

4. Login or Authentication Is Broken

Login problems are common in modern applications.

For example:

• Users cannot log in
• Session expires unexpectedly
• JWT token is not handled correctly
• Password reset does not work
• OAuth callback fails
• Cookies are not configured correctly

Authentication should be debugged carefully because it is directly connected to application security.

5. Website Works Locally but Not on Server

This is one of the most common deployment problems.

A developer may see:

“It works on my machine.”

But after deployment:

Environment variables missing
Database connection failed
Build failed
API URL incorrect
Port configuration incorrect
CORS error
SSL/HTTPS problem

The solution usually involves checking the deployment environment, environment variables, logs, dependencies, networking and server configuration.

6. Mobile Website Is Broken

A website may look good on a laptop but have problems on mobile:

• Buttons overlap
• Text goes outside the screen
• Menu does not open
• Images are too large
• Forms are difficult to use
• Horizontal scrolling appears

Responsive design fixes can make the application work properly across mobile, tablet and desktop devices.

7. Deployment and CI/CD Problems

Sometimes the application code is correct but deployment is failing.

Common problems include:

• Docker build failures
• GitHub Actions failures
• Incorrect environment variables
• Nginx configuration issues
• Node/Python version mismatch
• Database migration failures
• SSL configuration problems

A proper deployment setup makes future releases faster and more reliable.

Don't Rebuild Your Website Immediately

If your existing website has problems, you may not need a completely new website.

First identify:

What is broken → Wh