Medusa
Open-source Node.js headless commerce engine with modular architecture for building custom e-commerce backends with full API control.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Self-hosted — security depends on deployment configuration. Use HTTPS reverse proxy and rotate API keys regularly.
⚡ Reliability
Best When
Best for technical teams wanting full commerce backend control without Shopify pricing or lock-in.
Avoid When
Avoid when you need a managed SaaS with built-in hosting, analytics, and app store ecosystem.
Use Cases
- • Build AI-powered shopping agents that manage cart, checkout, and order fulfillment via REST API
- • Automate inventory management and product catalog updates via the admin API
- • Create custom fulfillment workflows that integrate with third-party logistics providers
- • Build subscription commerce flows using Medusa's extensible module system
- • Implement B2B commerce with customer groups, price lists, and custom tax configurations
Not For
- • Teams needing a hosted SaaS commerce platform without infrastructure management
- • Simple storefronts where Shopify's ecosystem and plugins are sufficient
- • Non-Node.js shops — Medusa is TypeScript/Node.js only
Interface
Authentication
Admin API uses API tokens. Storefront API uses JWT for customer auth. Publishable API keys for storefront.
Pricing
MIT licensed core. Self-hosting is free; Medusa Cloud is a paid managed option.
Agent Metadata
Known Gotchas
- ⚠ Medusa 2.x is a major architectural rewrite from 1.x — modules, workflows, and API routes are completely different
- ⚠ The local API (used within the backend) bypasses HTTP and is faster but has different error handling than the REST API
- ⚠ Workflows (Medusa 2.x) are step-based with compensation functions — failed steps trigger rollback steps automatically
- ⚠ Cart region must be set before adding items — missing region causes silent failures or wrong currency pricing
- ⚠ Admin and storefront APIs share the same server but use different auth — mixing up API keys causes 401s with misleading messages
Alternatives
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Scores are editorial opinions as of 2026-03-07.