Open Source Headless eCommerce Platforms

What Headless eCommerce Actually Means

In a traditional (monolithic) ecommerce platform like WooCommerce or PrestaShop, the same application handles both the backend logic (processing orders, managing inventory, calculating taxes) and the frontend rendering (generating the HTML pages customers see). When a customer visits a product page, the server queries the database, processes the data, renders a template, and sends complete HTML to the browser. The frontend and backend are one system.

In headless ecommerce, the backend is a commerce API server that stores and processes all commerce data but generates no customer-facing HTML. The frontend is a completely separate application, usually a JavaScript single-page application (SPA) or a server-side rendered (SSR) application built with a framework like Next.js, Nuxt, or Remix. The frontend makes API calls to the commerce backend to fetch product data, create carts, process checkouts, and retrieve order information. The two systems communicate through REST or GraphQL APIs but are otherwise independent.

This separation creates real advantages and real costs. The advantages: your frontend team can use whatever technology they prefer, you can serve multiple frontends (website, mobile app, in-store kiosk, wholesale portal) from a single backend, you can deploy the frontend to edge networks for sub-100ms page loads, and you can redesign the customer experience completely without touching the commerce logic. The costs: you need frontend developers capable of building and maintaining a complete storefront, there is no "install a theme and launch" path, development time and cost are 2 to 5 times higher than monolithic platforms, and the operational complexity of managing two separate applications increases maintenance burden.

When Headless Makes Sense

Headless ecommerce is not the right choice for every store. It is specifically valuable in these scenarios:

Custom shopping experiences. When your business model requires a shopping experience that cannot be achieved within the template constraints of traditional platforms. Custom product configurators, augmented reality try-on features, interactive product builders, or unique checkout flows that differ fundamentally from standard ecommerce templates.

Multi-channel commerce. When you need to sell through a website, a mobile app, a wholesale portal, an in-store kiosk, or third-party channels like Instagram Shopping, all managed from a single inventory and order management system. Headless backends serve all channels through the same API.

Performance-critical stores. When page speed is a competitive advantage and you need static generation, edge caching, and sub-second page loads globally. A Next.js storefront deployed on Vercel or Netlify with static generation can serve product pages from CDN edge nodes worldwide in under 100 milliseconds, performance that server-rendered monolithic platforms cannot match.

Developer-led teams. When your team has strong frontend development capabilities and prefers working in React, Vue, or Svelte over PHP templates. Headless backends let developers use the tools they are most productive with rather than learning a platform-specific template language.

If none of these apply to you, a traditional platform like WooCommerce or PrestaShop will serve you better at lower cost with less complexity. For a comparison of traditional options, see our guide to WooCommerce vs PrestaShop.

Saleor

Saleor is the most mature purpose-built open source headless ecommerce platform. Built on Python with Django and PostgreSQL, it provides a GraphQL API that has become a reference implementation for how commerce APIs should be designed.

API design. Saleor's GraphQL API is typed, well-documented, and consistent. Product queries support filtering by category, collection, attributes, price range, and availability. Checkout mutations handle adding items, applying discounts, setting shipping methods, and processing payments in a clear, predictable sequence. Subscriptions (real-time events over WebSocket) allow frontends to display live order status updates without polling. The API documentation includes a GraphQL playground where developers can explore queries and mutations interactively.

Multi-channel commerce. Saleor's channel system lets you run multiple storefronts from a single backend, each with independent product availability, pricing, currency, shipping methods, and warehouse assignments. A common setup uses one channel for a consumer website, another for a wholesale portal with volume pricing, and a third for a mobile app with mobile-specific promotions. Products can be available on some channels and hidden on others, with different prices per channel.

Commerce features. Products, categories, and collections with rich attribute systems. Multi-warehouse inventory with per-warehouse stock tracking and allocation. Draft orders for phone and email orders. Gift cards with configurable values. Discount rules including percentage discounts, fixed discounts, free shipping, and voucher codes with usage limits. Webhook subscriptions for order events, payment events, and product changes. Plugin architecture for payments (Stripe, Adyen, PayPal supported), tax calculation, shipping, and notifications.

Admin dashboard. Saleor ships a React and TypeScript admin dashboard that provides a polished interface for product management, order processing, customer management, discount configuration, and store settings. The dashboard is a separate application that communicates with the backend through the same GraphQL API your storefront uses, demonstrating the headless architecture in practice.

Deployment. Docker Compose for development and production. The backend requires Python 3.10+, PostgreSQL, Redis, and Celery for background tasks. Cloud deployment options include AWS (ECS or EKS), Google Cloud (Cloud Run or GKE), and DigitalOcean App Platform. Saleor also offers a managed cloud service for teams that do not want to handle infrastructure.

Best for: Teams with Python expertise building multi-channel commerce experiences. The most mature GraphQL API in open source ecommerce.

Medusa

Medusa is a modular headless commerce platform built in Node.js with TypeScript, designed around composable architecture where every commerce function is an independent, swappable module.

Modular architecture. Medusa's core is a framework that orchestrates modules. The product module, order module, payment module, fulfillment module, pricing module, inventory module, and customer module are all independent packages with well-defined interfaces. You can use the default implementation of any module or replace it with a custom version. Want a custom pricing engine that factors in real-time competitor data? Replace the pricing module. Need a fulfillment workflow that integrates with your warehouse management system? Replace the fulfillment module. This modularity provides deeper extensibility than plugin systems that merely hook into predefined extension points.

Developer experience. Medusa is built for JavaScript and TypeScript developers, and the developer experience reflects this. TypeScript throughout the codebase provides type safety and excellent IDE autocompletion. The API client (@medusajs/js-sdk) provides type-safe access to all API endpoints. Custom API routes, subscribers (event handlers), and scheduled jobs follow familiar Node.js patterns. The workflow engine allows defining multi-step business processes (like order fulfillment) as composable, reusable workflow steps with built-in compensation (rollback) logic.

Starter storefront. Medusa provides a Next.js starter storefront that demonstrates best practices for building a commerce frontend on the platform. It includes product listing, product detail pages, cart management, multi-step checkout, customer accounts, and order history. The starter is designed to be forked and customized rather than used as-is, but it provides a substantial head start compared to building a storefront from scratch.

Commerce features. Product management with variants, options, and custom metadata. Multi-currency pricing with per-region price lists. Inventory management with stock locations. Cart management with line item adjustments and custom metadata. Promotions with conditions and rules. Customer groups with group-specific pricing. Gift cards. Tax-inclusive and tax-exclusive pricing. Order management with fulfillment tracking. Return and exchange workflows.

Deployment. Node.js 18+ with PostgreSQL and Redis. Docker support for containerized deployment. Works well on Railway, Render, DigitalOcean App Platform, or self-managed VPS with PM2 as a process manager. Frontend deployment is independent, typically on Vercel or Netlify for Next.js storefronts.

Best for: JavaScript and TypeScript teams who want maximum architectural flexibility and a modern developer experience. The most extensible headless platform through its module replacement system.

Vendure

Vendure is a headless ecommerce framework built on Node.js with TypeScript, using NestJS as its application framework and offering both GraphQL and REST APIs. It fills a niche between Saleor's Python-based maturity and Medusa's module-based flexibility.

Technical foundation. Vendure uses NestJS for its server framework, TypeORM for database access (supporting PostgreSQL, MySQL, MariaDB, and SQLite), and provides both a Shop API (for customer-facing operations) and an Admin API (for back-office operations). The plugin system follows NestJS module patterns, making it accessible to developers familiar with Angular-style dependency injection and module architecture.

Admin UI. Vendure includes an Angular-based admin interface with product management, order processing, customer management, promotions, and shipping configuration. The admin UI supports UI extensions, allowing plugins to add custom pages, widgets, and form fields to the admin interface without modifying the core admin code.

Commerce features. Products with variants and faceted navigation. Multi-channel support. Flexible promotion system with conditions and actions. Tax configuration with zones and tax categories. Shipping with configurable methods and eligibility rules. Payment integration with Stripe, Braintree, Mollie, and others via plugins. Customer groups and custom fields extensible on any entity.

Best for: Teams familiar with NestJS or Angular patterns who want a well-structured, TypeScript-first headless commerce framework with strong admin UI extensibility.

Using Traditional Platforms in Headless Mode

You do not necessarily need a purpose-built headless platform. Both Magento Open Source and WooCommerce can operate in headless or hybrid configurations.

Magento Open Source provides comprehensive REST and GraphQL APIs that support headless frontend development. The GraphQL API covers product queries, cart management, checkout, customer authentication, and order history. PWA Studio, Magento's progressive web app framework, is designed specifically for headless Magento storefronts. This approach lets you leverage Magento's powerful backend (multi-store, complex catalogs, B2B features) while building a modern frontend. The trade-off is Magento's substantial infrastructure requirements and operational complexity remain, you just add frontend complexity on top.

WooCommerce exposes a REST API through the WordPress REST API and the WooCommerce REST API. Products, orders, customers, coupons, and shipping zones are all accessible through API endpoints. Several community projects (including the WooCommerce Store API) support headless checkout flows. This lets you build a Next.js or Gatsby storefront that pulls product data from WooCommerce. The trade-off is that WooCommerce's API was designed as an add-on to a traditional platform rather than as a primary interface, so some operations (like complex checkout flows with custom payment gateways) may not be fully supported through the API alone.

Frontend Framework Choices

Once you choose a headless backend, you need to choose a frontend framework. The most common choices in 2026:

Next.js is the dominant frontend framework for headless ecommerce. Server-side rendering (SSR) for SEO, static generation (SSG) for performance, incremental static regeneration (ISR) for dynamic content with CDN-level speed, and React Server Components for reduced client-side JavaScript. Most headless platforms provide Next.js starter templates. Deployment on Vercel provides automatic edge caching and preview deployments.

Remix provides server-rendered React with a focus on progressive enhancement and web standards. Its nested routing and data loading patterns work well for ecommerce where product pages, category pages, and checkout steps have clear hierarchical relationships. Remix's form handling and action functions simplify checkout implementation.

Nuxt (Vue.js) offers the same SSR and SSG capabilities as Next.js for teams that prefer Vue over React. Vue Storefront provides a pre-built integration layer between Nuxt and multiple headless backends including Magento, commercetools, and Shopify.

Hydrogen (Shopify) is proprietary and not open source, but worth mentioning as context. It is Shopify's headless framework, built on React and Remix. If you are evaluating headless Shopify against open source headless options, the comparison is between Hydrogen plus Shopify's backend (proprietary, monthly fees) versus Next.js plus Saleor or Medusa (open source, self-hosted).

Cost and Complexity Reality Check

Headless ecommerce development costs are substantially higher than traditional platform deployment. Be realistic about these costs before committing.

Minimum viable storefront development: 200 to 500 hours of frontend development for a production-quality storefront with product listings, search, product detail pages, cart, checkout, customer accounts, and order history. At $75 to $150 per hour for experienced React or Vue developers, this represents $15,000 to $75,000 in frontend development alone before the store launches.

Backend deployment and configuration: 20 to 80 hours for setting up the headless backend, configuring products, payment gateways, shipping methods, and tax rules. If you use the platform's managed cloud service (Saleor Cloud, for example), deployment time drops significantly.

Ongoing maintenance: Frontend applications require ongoing updates (dependency updates, framework upgrades, bug fixes, feature additions). Budget 10 to 40 hours per month for a development team to maintain a headless ecommerce storefront, compared to 2 to 10 hours per month for a traditional platform.

If these costs are beyond your budget, a traditional platform is the pragmatic choice. There is no shame in choosing WooCommerce or PrestaShop because they match your budget and team. Headless architecture is a tool for specific needs, not an upgrade for all stores.