Medusa vs Commerce
Medusa and Commerce are both fullstack apps tools. The structural differences are in the side-by-side below. The sharper question is what each one assumes you'll never violate: CodeSea found 12 unvalidated assumptions in Medusa and 12 in Commerce. They share 1 technologies including typescript.
medusajs/medusa
vercel/commerce
Hidden Assumptions
What each codebase relies on but never validates. The category mix shows where each is most exposed when the world it runs in changes.
Medusa (12)
The priceLists parameter has properties price_list_rules and prices arrays that can be mutated in-place, and buildPriceListRules/buildPriceSetPricesForCore functions will return compatible array types
The apiFields parameter contains valid property paths that exist on the priceList objects being filtered, and the filtering logic can handle nested object structures
Module service classes passed to Module() constructor have a working constructor that can be instantiated by the dependency injection container without throwing errors
Commerce (12)
SHOPIFY_STOREFRONT_ACCESS_TOKEN environment variable exists and contains a valid token that won't expire during the app's lifetime
ProductVariant.price.amount is always a valid numeric string that can be parsed with Number() and won't contain currency symbols or formatting
CartItem.merchandise.id matches the merchandiseId parameter format used by Shopify's API, and cart.lines array contains items with this exact structure
| Assumption category | Medusa | Commerce |
|---|---|---|
| Shape | 2 | 1 |
| Ordering | 1 | 1 |
| Environment | 2 | 2 |
| Scale | 1 | 1 |
| Domain | 1 | 2 |
| Contract | 3 | 3 |
| Temporal | 1 | 1 |
| Resource | 1 | 1 |
Technology Stack
Shared Technologies
Only in Medusa
node.js express.js mikroorm postgresql redis awilix react jest turboOnly in Commerce
next.js 15 react 19 shopify storefront api tailwind css geist fontArchitecture Layers
Medusa (4 layers)
Commerce (3 layers)
Data Flow
Medusa (5 stages)
- HTTP request routing
- Module service invocation
- Database entity operations
- Response transformation
- Inter-module event propagation
Commerce (5 stages)
- Load initial page data
- Render product catalog
- Handle cart interactions
- Process search and filtering
- Sync cart state
System Behavior
| Dimension | Medusa | Commerce |
|---|---|---|
| Data Pools | 3 | 3 |
| Feedback Loops | 2 | 2 |
| Delays | 2 | 3 |
| Control Points | 3 | 3 |
Code Patterns
Unique to Medusa
modular service architecture provider plugin system event-driven architecture api response transformationUnique to Commerce
server component + client interactivity optimistic updates graphql fragment composition cache tag invalidationWhen to Choose
Choose Commerce when you need
- Unique tech: next.js 15, react 19, shopify storefront api
Frequently Asked Questions
What are the main differences between Medusa and Commerce?
Medusa has 9 components with a connectivity ratio of 0.0, while Commerce has 7 components with a ratio of 0.0. They share 1 technologies but differ in 14 others.
Should I use Medusa or Commerce?
Choose Medusa if you need: Unique tech: node.js, express.js, mikroorm. Choose Commerce if you need: Unique tech: next.js 15, react 19, shopify storefront api.
How does the architecture of Medusa compare to Commerce?
Medusa is organized into 4 architecture layers with a 5-stage data pipeline. Commerce has 3 layers with a 5-stage pipeline.
What technology does Medusa use that Commerce doesn't?
Medusa uniquely uses: node.js, express.js, mikroorm, postgresql, redis. Commerce uniquely uses: next.js 15, react 19, shopify storefront api, tailwind css, geist font.
Explore the interactive analysis
See the full hidden-assumptions report, pipeline, and system behavior.
Medusa CommerceRelated Fullstack Apps Comparisons
Compared on April 20, 2026 by CodeSea. Written by Karolina Sarna.