Can I track both API endpoints and webpage visits with Cloudflare Workers?

Yes! You can record server-side API requests, webhook deliveries, and frontend pageviews with the same unified website UUID.

Sufyaan Studio Engineering•3 min read

How to Track Traffic and APIs on Cloudflare Workers

A developer guide to server-side analytics, subrequest tracking, and HTMLRewriter script injection on Cloudflare Workers and Pages.

Direct Tutorial Summary

By Sufyaan Studio Engineering•Verified August 2026

To track traffic on Cloudflare Workers, send an asynchronous POST subrequest to https://analytics-collect.sufyaanstudio.workers.dev/api/send inside ctx.waitUntil(), or use HTMLRewriter to inject the 1.15 KB tracker into outgoing HTML responses.

KEY TAKEAWAYS

Step 1: Non-Blocking Subrequest via ctx.waitUntil
Step 2: Add Website UUID Secret in Wrangler
Step 3: Monitor Ingestion in Live Realtime Dashboard

Step 1: Non-Blocking Subrequest via ctx.waitUntil

In your Cloudflare Worker fetch handler, invoke ctx.waitUntil() to dispatch the pageview without adding any response latency.

CODE STEP 1

export default {
  async fetch(request: Request, env: any, ctx: ExecutionContext): Promise<Response> {
    const response = await fetch(request);
    const url = new URL(request.url);

    ctx.waitUntil(
      fetch('https://analytics-collect.sufyaanstudio.workers.dev/api/send', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          w: env.ANALYTICS_WEBSITE_ID,
          u: url.pathname + url.search,
          r: request.headers.get('Referer') || '',
        }),
      })
    );

    return response;
  }
};

Step 2: Add Website UUID Secret in Wrangler

Save your website UUID to your Cloudflare Worker configuration.

CODE STEP 2

npx wrangler secret put ANALYTICS_WEBSITE_ID

Step 3: Monitor Ingestion in Live Realtime Dashboard

Open your Analytics dashboard to observe real-time pageviews and geographic distribution instantly.

FAQ & VERIFICATION

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How to Track Traffic and APIs on Cloudflare Workers

Step 1: Non-Blocking Subrequest via ctx.waitUntil

Step 2: Add Website UUID Secret in Wrangler

Step 3: Monitor Ingestion in Live Realtime Dashboard

Guide FAQ

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