How to build a Shopify app? Full Flow

A Shopify app is basically a web application that connects to Shopify through Shopify’s APIs and lets merchants add functionality to their stores.

How to build a Shopify app

The overall process looks like this:

Idea → Create app → Choose tech stack → Connect to Shopify → Add functionality → Test → Deploy → Install

1. Decide what your app will do

First, define the problem your app solves.

For example:

• Product management app
• Order-management app
• Inventory automation
• Discount app
• Customer loyalty app
• Analytics dashboard
• Shipping integration
• AI product-description generator

Suppose we want to build:

An app that automatically generates product descriptions using AI.

---

2. Create a Shopify app

You'll generally work through the Shopify Partner Dashboard and Shopify's app-development tooling.

You create an app and configure things such as:

• App name
• App URL
• Redirect URLs
• API access
• Permissions/scopes
• Webhooks
• Extensions, if needed

Shopify provides development tools to make this process easier.

---

3. Choose your technology

A Shopify app is essentially a normal web application that communicates with Shopify.

A common stack is:

Frontend
   ↓
React / Shopify Polaris
   ↓
Backend
   ↓
Node.js / Remix
   ↓
Shopify APIs
   ↓
Shopify Store

You can also use other backend technologies such as Python, Ruby, PHP, etc.

For a beginner, a common modern choice is:

Shopify + Remix/React + Node.js + Shopify APIs

---

4. Connect your app to Shopify

This is one of the most important parts.

Your app communicates with Shopify using Shopify APIs.

There are two major APIs you'll commonly encounter:

Admin GraphQL API

Used for things like:

• Products
• Orders
• Customers
• Inventory
• Metafields

Storefront API

Used primarily for building custom storefront experiences.

For example, your app might ask Shopify:

Give me all products
        ↓
Shopify Admin API
        ↓
Product data
        ↓
Your app

---

5. Request permissions

Your app needs permission to access specific Shopify data.

For example:

read_products
write_products
read_orders

You should request only the permissions your app actually needs.

For our AI-description app:

read_products
write_products

might be sufficient.

---

6. Build your app UI

If your app has an admin interface, you can build screens such as:

┌─────────────────────────────────┐
│        AI Product Writer        │
├─────────────────────────────────┤
│                                 │
│ Product: Blue Cotton T-Shirt    │
│                                 │
│ [ Generate Description ]        │
│                                 │
│ ─────────────────────────────── │
│ Generated Description:          │
│                                 │
│ Premium blue cotton T-shirt...  │
│                                 │
│ [ Save to Shopify ]             │
└─────────────────────────────────┘

Shopify's Polaris design system provides components that help your app look and behave consistently with Shopify Admin.

---

7. Use Shopify APIs

Your backend can make requests to Shopify.

Conceptually:

Merchant
   ↓
Your App
   ↓
Shopify Admin API
   ↓
Shopify Database

For example:

Your app:
"Get product #123"

Shopify:
"Here is the product information."

Your app:
"Update the product description."

Shopify:
"Updated."

---

8. Add webhooks when needed

Sometimes your app needs to know when something happens in Shopify.

For example:

Product created
       ↓
Shopify webhook
       ↓
Your app
       ↓
Generate AI description
       ↓
Update product

Common webhook events include things like:

• Product creation/update
• Order creation
• Customer creation
• App uninstall

Webhooks are especially useful for automation.

---

9. Test your app

You normally test against a development store before releasing the app.

You should test:

• Installation
• Authentication
• API permissions
• Creating/updating Shopify data
• Webhooks
• Error handling
• Uninstall behavior
• Different merchant scenarios

---

10. Deploy your app

Your app needs to run on a publicly accessible server.

For example:

Shopify
   ↕
Internet
   ↕
Your deployed app
   ↕
Your database / services

You can host the application using services such as Shopify-compatible cloud hosting providers, AWS, Google Cloud, Azure, Vercel, etc., depending on your architecture.

---

11. Decide how merchants will install it

There are two broad directions:

Custom app

Built for a specific Shopify store/merchant.

Your company
     ↓
Specific Shopify store
     ↓
Your app

Public app

Built for many Shopify merchants.

Merchant A ─┐
Merchant B ─┼──→ Your Shopify App
Merchant C ─┘

Public apps have additional requirements around distribution, review, billing, security, and Shopify's app requirements.

---

The architecture

A typical Shopify app can look like this:

                 SHOPIFY
                    │
                    │
             Shopify APIs
                    │
                    ▼
          ┌──────────────────┐
          │   Your Backend   │
          │                  │
          │ Authentication   │
          │ Business Logic   │
          │ API Calls        │
          │ Webhooks         │
          └────────┬─────────┘
                   │
          ┌────────┴────────┐
          ▼                 ▼
      Database          External APIs
                         / AI / etc.
          │
          ▼
     Your Frontend
          │
          ▼
     Shopify Admin

The important concepts to learn

If you're learning Shopify app development, I'd learn these in roughly this order:

1. What a Shopify app is
2. Custom apps vs public apps
3. Shopify Partner Dashboard
4. Development stores
5. OAuth / authentication
6. Admin GraphQL API
7. API access scopes
8. Webhooks
9. Shopify Polaris
10. App Bridge
11. App extensions
12. Billing
13. App deployment
14. Public app review/distribution

If you're starting from zero, the next useful step is to build a small real Shopify app rather than trying to learn all of these concepts separately.