Shopify App Dev

Shopify App Development

Before writing code

Fetch live docs:

1. Fetch https://shopify.dev/docs/apps/build for app development overview
2. Web-search site:shopify.dev app bridge for current App Bridge APIs and CDN version
3. Web-search site:shopify.dev shopify-app-template-remix for Remix template patterns
4. Web-search site:shopify.dev shopify-app-remix authenticate for authentication APIs
5. Web-search site:github.com shopify shopify-app-template-remix for latest template source

App Types

Public Apps (App Store)

• Listed on Shopify App Store
• Installed by any merchant via OAuth flow
• Must pass Shopify app review
• Use session tokens for authentication

Custom Apps

• Built for a single store
• Installed directly from admin (Settings > Apps)
• Simpler auth: custom app access token (shpca_ prefix)

Private Apps (Legacy)

• Deprecated — migrate to custom apps
• Used hardcoded credentials (shppa_ prefix)

Remix App Architecture

The official template (shopify-app-template-remix):

shopify app init
# Select "Remix" template
# Provides: auth, session storage, webhook handling, Polaris UI

Key Files

Fetch live docs for the current template file structure — files and patterns evolve with @shopify/shopify-app-remix versions.

Minimal Pattern: Authenticated Loader

// Pattern: authenticate admin request, call GraphQL, return data
// Fetch live docs for current authenticate.admin() API shape
import { json, type LoaderFunctionArgs } from "@remix-run/node";
import { authenticate } from "../shopify.server";

export const loader = async ({ request }: LoaderFunctionArgs) => {
  const { admin } = await authenticate.admin(request);
  const response = await admin.graphql(`{ shop { name } }`);
  const { data } = await response.json();
  return json({ shopName: data.shop.name });
};

OAuth Flow

1. Merchant clicks "Install" → redirected to Shopify consent screen
2. Shopify shows requested scopes → merchant approves
3. Shopify redirects to your app with authorization code
4. Your app exchanges code for access token (shpua_ prefix)
5. Token stored in session storage (Prisma, SQLite, Redis, etc.)
6. Subsequent requests use session tokens (JWT) via App Bridge

The Remix template handles steps 1-5 automatically via authenticate.admin().

Fetch live docs: Web-search site:shopify.dev oauth flow app installation for current OAuth endpoints and token exchange details.

Session Tokens

Modern Shopify apps use JWT session tokens instead of cookies:

• App Bridge sends token in Authorization: Bearer header
• Token is verified server-side using the app's API secret
• Contains: iss (shop domain), dest (shop URL), sub (user ID), aud (API key)
• Short-lived (1 minute), auto-refreshed by App Bridge
• Never use cookies for auth in embedded apps

Fetch live docs: Web-search site:shopify.dev session tokens jwt for current token payload structure and verification.

App Bridge

JavaScript library for embedded apps to communicate with Shopify admin:

Note: App Bridge v1/v2 are superseded. Use the current CDN-hosted version (automatically included with @shopify/shopify-app-remix).

Fetch live docs: The App Bridge API surface changes frequently. Web-search site:shopify.dev app bridge for current methods, resource picker options, and modal API.

App Configuration (shopify.app.toml)

# Stable structure — fetch live docs for current field names
name = "My Shopify App"
client_id = "your-api-key"

[access_scopes]
scopes = "read_products,write_products,read_orders"

[auth]
redirect_urls = ["https://your-app.com/auth/callback"]

[webhooks]
api_version = "2025-01"  # Update to latest stable version

Fetch live docs: Web-search site:shopify.dev shopify.app.toml configuration for current TOML fields — new sections are added for extensions, app proxy, POS, etc.

App Extensions

Apps can provide extensions that appear in various Shopify surfaces:

Fetch live docs: Extension types expand regularly. Web-search site:shopify.dev app extensions types for the current list and configuration patterns.

Scopes

Request minimum necessary scopes:

Fetch live docs: New scopes are added with new API features. Web-search site:shopify.dev access scopes for the full current list.

Webhook Handler Pattern

// Pattern: authenticate webhook, switch on topic, process
// Fetch live docs for current webhook topic constants
export const action = async ({ request }: ActionFunctionArgs) => {
  const { topic, shop, payload } = await authenticate.webhook(request);

  switch (topic) {
    case "APP_UNINSTALLED":
      // Clean up shop data
      break;
    case "CUSTOMERS_DATA_REQUEST":
    case "CUSTOMERS_REDACT":
    case "SHOP_REDACT":
      // Handle mandatory GDPR webhooks
      break;
  }
  return new Response();
};

Best Practices

• Use the Remix template (shopify app init) — do not build from scratch
• Use session tokens over cookies for embedded apps
• Request minimum OAuth scopes needed
• Handle webhook deduplication with idempotency keys
• Implement all mandatory GDPR webhooks (customers/data_request, customers/redact, shop/redact)
• Use App Bridge for navigation and UI — do not build custom admin chrome
• Store access tokens encrypted, never in client-side code
• Test with development stores before submitting for review
• Use authenticate.admin() in every loader/action that needs store data

Fetch the Shopify app development guide, App Bridge docs, and Remix template source for exact APIs, session token structure, and extension patterns before implementing.