How to migrate from Magento to MedusaJS?
Migration phases, B2B catalog mapping, ERP integrations, risks and time/cost ranges. When Medusa v2 replaces Magento 2 financially.
Migrating from Magento 2 to MedusaJS v2 makes sense when a company wants headless commerce, one backend for web and app, custom B2B workflows and lower vendor lock-in risk. A typical GMI project takes 4-8 months and costs EUR 55,000 - 120,000, but fixed price only makes sense after auditing data, integrations and the cutover plan.
When should you migrate from Magento to Medusa?
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.
What most Magento migration guides miss
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.
Magento to Medusa v2 migration phases
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.
- 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.
- Phase 2 - core commerce (8-12 weeks): Medusa v2 plus order modules, catalog, checkout, admin. Parallel product data migration and B2B price regression tests.
- 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.
What to migrate, and what not to copy 1:1
Migrate: active catalogue, variants, attributes used in filters and PIM, active customers, addresses, current B2B price lists, campaign-critical coupons, shipping methods and live payment integrations. This is the MVP base that keeps sales running after cutover.
Do not automatically copy: old ownerless attributes, disabled SKUs, abandoned discount rules, historical carts, every marketplace module or order history into the active Medusa model. Order history often works better as a read-only archive through ERP or a data warehouse.
Technical decision: if Magento was the price source of truth, move that logic to Medusa or ERP. If ERP was the source of truth, Medusa should consume and cache data, not create a second competing pricing system.
B2B data mapping from Magento
The hardest part of B2B migration is not products but commercial rules: price lists per customer group, credit limits, MOQs, approval workflows. In Magento they often live in custom modules or ERP with hourly sync - you must define the source of truth before Medusa import.
Typical GMI plan: phase 1 migrates active B2B customers and current price lists; order history (read-only) in phase 2 or via ERP API without full Medusa import. We avoid copying dirty attributes “just in case”.
Risks and how to reduce them
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.
Cutover, SEO and rollback: the migration part you cannot leave until the end
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.
Cost, timeline and next step
GMI ranges: B2B migration with ERP EUR 55,000 - 120,000 fixed price after DDT. MVP without full order history: 3-4 months. Full programme: 4-8 months. MedusaJS is open-source - cost moves from license to architecture, integrations and maintenance.
MedusaJS development: https://gmi.software/services/medusajs-development
Sources and references
MedusaJS documentation (v2 architecture, modules): https://docs.medusajs.com
Medusa integrations documentation: https://docs.medusajs.com/resources/integrations
Medusa commerce modules documentation: https://docs.medusajs.com/learn/fundamentals/modules
Adobe Commerce / Magento 2: https://business.adobe.com/products/magento/magento-commerce.html
Adobe Commerce released versions and support dates: https://experienceleague.adobe.com/en/docs/commerce-operations/release/versions
GMI Medusa implementation cost: https://gmi.software/blog/medusa-implementation-cost-2026
Medusa vs Shopify Plus TCO: https://gmi.software/blog/medusa-vs-shopify-plus-tco
Frequently asked questions
- How long does Magento to Medusa migration take?
- Typically 4-8 months end-to-end with B2B and ERP. MVP without full historical order migration: 3-4 months. Discovery before kickoff reduces schedule slip risk.
- Does Medusa support multi-store like Magento?
- Yes - regions, currencies and sales channels in Medusa v2. Mapping many store views needs a discovery-phase plan - we do not copy 1:1 without analysis.
- Can migration run in phases?
- Yes - recommended model: B2B checkout and catalog on Medusa first, Next.js storefront, then history migration and Magento decommission. A parallel read-only period lowers business risk.
- Who implements Medusa migration in Europe?
- GMI Software from Gdansk - audit, data migration, B2B modules, Next.js storefront, English delivery for EU/UK/US. Contact: gmi.software/services/medusajs-development.
Content updated: July 11, 2026
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