Migrating from Shopify to Medusa Headless Commerce: A Technical Guide

Migrating from Shopify to Medusa.js is a significant architectural decision. Shopify is a proven platform with an extensive app ecosystem, but its limitations — platform fees, rigid checkout, limited customization — push growing brands toward headless alternatives. This guide walks through the technical migration process step by step.

Phase 1: Data Export and Audit. Shopify's admin API provides access to products, customers, orders, collections, and metafields. Use the GraphQL Admin API to export your data in batches, paginating through all records. Pay special attention to metafields — Shopify stores a lot of custom data here that is easy to miss. Export your theme's Liquid templates as well; while they will not be used directly in Medusa, they document your storefront's structure and edge cases.

Phase 2: Data Mapping and Transformation. Medusa's data model differs from Shopify's in key ways. Products in Shopify have variants; Medusa treats variants as first-class entities with their own inventory tracking. Collections in Shopify map to Collections in Medusa, but Medusa also supports custom product categories. Map your Shopify metafields to Medusa's custom data fields. This is the most labor-intensive part of the migration — budget at least 40% of your migration timeline here.

Phase 3: Storefront Rebuild. The biggest benefit of moving to Medusa is a fully customizable storefront. You can use Next.js Commerce as a starting template, which provides SEO-optimized product pages, cart, and checkout out of the box. Rebuild your product listing pages, category navigation, search functionality, and custom pages. Medusa's plugin system handles payment (Stripe, Razorpay), shipping, and fulfillment — configure these during the storefront build rather than after.

Phase 4: SEO Preservation. Changing your e-commerce platform risks losing search rankings if not handled carefully. Before going live, map every existing Shopify URL to its new Medusa URL structure. Shopify uses /products/{handle} and /collections/{handle}; Medusa can match this exactly. Set up 301 redirects for any URL that changes. Export your Shopify sitemap and compare it against the new Medusa sitemap to ensure every page is accounted for. Maintain the same product schema.org markup structure to preserve rich results.

Phase 5: Data Migration and Validation. Run a trial migration to a staging environment first. Compare product counts, order histories, customer records, and inventory levels between Shopify and Medusa. Validate pricing — including compare-at prices, tiered pricing, and currency conversions. Run automated tests that check every product page renders correctly, every variant is purchasable, and every discount code applies as expected.

Phase 6: Cutover. Use Medusa's import functionality for the final data migration. Point your production domain to the new Medusa storefront. Keep Shopify active in read-only mode for 30 days to handle returns, exchanges, and edge cases that surface post-migration. Monitor your 404 rate, conversion rate, and page load speeds closely during this period.

The entire migration typically takes 8-16 weeks depending on store complexity. The result is a storefront that loads 2-3x faster, has zero per-transaction platform fees, and can be extended arbitrarily through Medusa's plugin architecture.