Jun 20, 2026

What Is Shopify Tunnel? Explained for Beginners

When you run a Shopify app locally, it lives at http://localhost:3000. Only your own machine can see it. Shopify’s servers, sitting somewhere on the internet, have no path to reach inside your computer. That is the problem a Shopify tunnel solves.

The Toy Shop Analogy

Imagine you built a shop inside your house. Your friends outside cannot see it. So you dig a secret tunnel that connects your indoor shop to the street. Now your friends can walk through that tunnel and visit.

Shopify Tunnel works exactly like that.

Why Localhost Is Unreachable

Why Shopify cannot access localhost: localhost is private and only visible to your computer, while Shopify servers on the public internet have no way to reach it

localhost is a special name that means “this computer only.” When you run npm run dev or shopify app dev, your app starts on a port like 3000 or 8080. Nothing outside your machine can connect to that address.

Shopify needs to send HTTP requests to your app for several things during development: OAuth callbacks, webhooks, embedded app loading. None of those work if your app is not reachable from the internet.

How the Tunnel Fixes It

Shopify tunnel flow diagram: Shopify servers send requests to a public Cloudflare tunnel URL which forwards them to localhost:3000 on your local machine during app development

Shopify CLI automatically creates a Cloudflare Quick Tunnel when you run:

shopify app dev

The CLI output shows something like:

Tunnel URL:
https://happy-cat-123.trycloudflare.com

Any request Shopify sends to that public URL gets forwarded straight to your local app. The full request path looks like this:

Shopify Server
  -> Public tunnel URL  (happy-cat-123.trycloudflare.com)
  -> Your computer      (localhost:3000)
  -> Your Shopify app

When You Actually Need a Tunnel

Feature	Needs Tunnel?
OAuth login and app installation	✅ Yes
Webhooks	✅ Yes
App proxy requests	✅ Yes
Embedded app (Admin UI)	✅ Yes
Local UI only, no Shopify callbacks	❌ No

If you are only building a front-end component with no Shopify callbacks, you do not need a tunnel. The moment Shopify needs to send a request back to your app, you do.

The One Line to Remember

A tunnel is a temporary public door for your localhost.

Beyond Shopify

localhost maps to 127.0.0.1, a loopback address that never leaves your machine. Tunnels are not unique to Shopify. Any feature where an outside service sends data back to your app needs one: think order confirmations, form submissions, or chat messages from a third-party platform. If it calls back to your machine, you need a tunnel.

The default Cloudflare tunnel gets a new URL on every restart. If you need a stable address, use the --tunnel-url flag with a persistent tunnel. I set mine up at dev.helloalberuni.com so the URL stays fixed across sessions.