Building a Headless E-commerce Storefront with Next.js

Traditional monolithic e-commerce platforms couple the database, backend logic, and frontend rendering into one system (like standard Shopify themes using Liquid). Headless commerce separates the frontend from the backend, communicating via APIs.

Why go Headless?

The primary driver is performance and flexibility. By building a custom Next.js frontend, you can achieve sub-second page loads using Static Site Generation (SSG) while still keeping Shopify as your robust backend for inventory, payment processing, and order management.

The Architecture

Frontend: Next.js hosted on Vercel. Product pages are statically generated at build time.
Data Fetching: The frontend queries the Shopify Storefront API (GraphQL) to fetch product details and create checkouts.
Content Management: A headless CMS like Sanity or Contentful is often used alongside Shopify to manage rich blog content or complex landing pages.

The Trade-offs

While headless offers ultimate control, it strips away the Shopify App ecosystem. If you want a product review widget, you cannot just click "Install" in the Shopify App Store. You have to write custom React components that interact with the review provider's API. Headless should only be considered by brands doing $5M+ in revenue with dedicated engineering teams.