How I Solved Ad Blocker Issues in a Next.js Application Using a Proxy API

Introduction

While working on a production Next.js application, I encountered an issue where certain third-party APIs and tracking services were being blocked by popular ad blockers such as uBlock Origin and AdBlock Plus. This caused parts of the application to stop working for users who had ad blockers enabled.

Instead of asking users to disable their ad blockers, I redesigned the request flow by introducing a server-side proxy in Next.js.

The Problem

The frontend was making requests directly to third-party endpoints.

Browser
    │
    ├── https://third-party-service.com/api/...
    │
    └── Response

• •API requests failed.
• •Tracking events were lost.
• •Some application features stopped working.
• •Users experienced inconsistent behavior depending on whether an ad blocker was installed.

Root Cause Analysis

The issue wasn't with the API itself. The requests never left the browser because the ad blocker intercepted them.

Since the browser was directly communicating with the third-party service, the ad blocker identified the destination as a tracking or advertising endpoint and blocked it.

The Solution

I introduced a proxy endpoint inside the Next.js application. Instead of calling the external service directly, the frontend now communicates only with the application's own backend.

Before:

Browser
      │
      ▼
Third-Party API

After:

Browser
      │
      ▼
Next.js API Route
      │
      ▼
Third-Party API

The browser now communicates only with my own domain. The Next.js server receives the request, forwards it to the third-party API, and returns the response to the client.

Because the browser never directly contacts the blocked domain, the request successfully reaches the server in most ad-blocking scenarios.

Implementation

I created a Next.js API route that acts as a proxy:

// app/api/proxy/route.ts

export async function POST(request: Request) {
  const body = await request.json();

  const response = await fetch("https://third-party-api.com/endpoint", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify(body),
  });

  const data = await response.json();

  return Response.json(data);
}

The frontend now calls the local proxy:

fetch("/api/proxy", {
  method: "POST",
  body: JSON.stringify(payload),
});

Instead of calling the external endpoint directly:

fetch("https://third-party-api.com/endpoint");

Benefits

This approach provided several advantages:

• •Reduced the impact of browser-based ad blockers on application functionality.
• •Kept third-party API endpoints hidden from the client.
• •Centralized authentication and request headers on the server.
• •Allowed logging, monitoring, and rate limiting in one place.
• •Simplified future integrations with external services.

Things to Keep in Mind

A proxy is not a universal bypass for every ad blocker. Some advanced blockers can still inspect requests to your own domain or block requests based on URL patterns or script behavior.

The goal is not to circumvent user preferences, but to make legitimate application functionality more reliable when it depends on third-party services.

• •Validate incoming requests.
• •Handle authentication securely.
• •Avoid creating an open proxy.
• •Implement rate limiting if the endpoint is publicly accessible.
• •Log failures for easier debugging.

Lessons Learned

Initially, I assumed the third-party API was unavailable because requests kept failing. After inspecting the browser's Network tab, I realized the requests were being blocked before they were sent.

Moving communication to a server-side proxy in Next.js made the integration more reliable, improved security by hiding external endpoints, and gave me better control over request handling and monitoring.

Conclusion

Using a Next.js proxy API was an effective architectural improvement. It reduced failures caused by browser ad blockers and centralized external API communication, making the application easier to maintain, secure, and observe.

Whenever a frontend application depends on third-party services, a server-side proxy is often a cleaner and more resilient design than exposing external APIs directly to the browser.