How to migrate from Magento to MedusaJS?

Magento 2 still fits a large monolith, a mature Adobe Commerce ecosystem and a team that knows the stack. MedusaJS v2 wins when headless storefront (Next.js), lower TCO without enterprise licenses, custom B2B workflows (contract pricing, credit limits, order approval) or one backend for web and a React Native app is the priority.

GMI Software recommends migration when Magento run cost (hosting, dev, marketplace apps) exceeds product development budget - common with B2B revenue and many integrations. Start with a data and integration audit before picking a Medusa partner.

Most guides talk about exporting products, customers and orders. That is not enough. In real B2B, the largest risk sits outside CSV files: pricing rules, custom checkout, payment plugins, stock sync, SEO redirects and manual sales-team processes.

Adobe Commerce still has active release lines and regular security patches, so migration should not be driven by headless fashion alone. It makes sense when monolith run cost blocks the roadmap and the company needs API-first architecture for multiple channels.

Medusa is not a magic Magento importer. It is a modular commerce engine. That means migration should be treated as replatforming: data model, source of truth, MVP scope, fallback, monitoring and old-system decommission plan.

Migration is a multi-phase programme, not a single-weekend big bang. We use the split below on B2B projects with ERP - timeline shortens with a clean D2C catalog, lengthens with undocumented custom Magento modules.

Broader headless and B2B context lives on our headless e-commerce page - migration is part of architecture, not a standalone IT ticket.

1. Phase 1 - discovery (2-3 weeks): map entities (products, variants, attributes, B2B price lists), integrations (ERP, PIM, WMS, payments) and sales channels. Output: MVP-prioritised roadmap.
2. Phase 2 - core commerce (8-12 weeks): Medusa v2 plus order modules, catalog, checkout, admin. Parallel product data migration and B2B price regression tests.
3. Phase 3 - storefront and channels (4-8 weeks): Next.js storefront, optionally a mobile app on the same API. Cutover in a low-traffic window with a rollback plan.

A pre-fixed-price audit reduces overrun risk because unknown modules, integrations and data become explicit scope. Below are the most common traps we see in discovery.

• Dirty product data - duplicate SKUs, missing attributes, broken variants. Mitigation: data quality report before import.
• Hidden logic in custom Magento modules - discounts, checkout, split payments. Mitigation: business workshop and rule mapping to Medusa v2 modules.
• Undocumented ERP integrations - price/stock sync “works for years”. Mitigation: data flow diagram and regression tests on ERP sandbox.
• No cutover plan - go-live in B2B peak season. Mitigation: low-traffic window, rollback to Magento via parallel read-only period.

The cutover plan should be created in discovery, not one week before launch. Minimum set: catalogue freeze, final delta import, checkout tests, ERP smoke test, order queue, payment-error monitoring, who approves rollback and how long Magento remains read-only.

SEO needs its own sheet: category and product URL mapping, canonicals, 301 redirects, indexable filters, sitemap, robots.txt and 404 monitoring after launch. Commerce migration without SEO planning can create a “successful launch” and an organic revenue drop one month later.

The safest B2B model: launch Medusa + Next.js on the new storefront, keep Magento as a read-only archive for 30-90 days, and expose order history through ERP or an archive layer. Decommission the old stack only after stabilization.