Medusa — Open Source Headless Commerce Engine

What it is

Medusa is an open-source headless commerce engine built with Node.js and TypeScript. It provides the backend infrastructure for e-commerce: products, orders, customers, payments, shipping, discounts, and inventory management through a REST and GraphQL API. The modular architecture lets you customize every aspect of the commerce logic without forking the codebase.

Medusa is for e-commerce teams that need flexibility beyond what Shopify or WooCommerce offer. If you need multi-region support, custom checkout flows, marketplace features, or deep integrations with existing systems, Medusa provides the commerce primitives while you build the frontend and business logic.

How it saves time or tokens

Medusa handles the complex commerce backend -- tax calculation, inventory tracking, payment processing, order management -- so you focus on the customer experience. The plugin system supports Stripe, PayPal, Klarna, and other payment providers without custom integration code. Multi-region and multi-currency support is built in, not bolted on. For AI-assisted development, Medusa's TypeScript codebase and well-documented API make it straightforward to generate integration code.

How to use

1. Create a new Medusa project: npx create-medusa-app@latest.
2. The installer sets up the backend, admin dashboard, and a starter storefront.
3. Configure payment providers, shipping options, and products through the admin UI or API.

Example

# Create a new Medusa project
npx create-medusa-app@latest my-store
cd my-store

# Start the backend
npx medusa develop

# The admin dashboard is at http://localhost:9000/app
# The API is at http://localhost:9000/store

# Example: List products via API
curl http://localhost:9000/store/products | jq '.products[].title'

# Example: Create a product via Admin API
curl -X POST http://localhost:9000/admin/products \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{"title": "Premium Widget", "status": "published"}'

Related on TokRepo

• AI tools for automation -- e-commerce workflow automation
• AI tools for API -- API integration and management

Common pitfalls

• Using Medusa for simple stores that Shopify handles well. Medusa shines for custom commerce experiences. If you need a standard online store with minimal customization, a hosted platform is faster to launch.
• Not planning the module architecture upfront. Medusa's modularity is powerful but requires understanding which modules to use, extend, or replace. Read the module documentation before customizing.
• Underestimating frontend development time. Medusa is headless -- it provides the API but you build the storefront. Factor in frontend development resources when planning your project timeline.