Strapi v4 to v5 Migration: Turnkey CMS Upgrade

Imagine your Strapi v4 project runs smoothly, but you want TypeScript support and better performance. You run npx @strapi/upgrade major — and half of your API stops responding. Errors in the console, blank pages, broken endpoints. These are standard consequences of an unprepared upgrade. Strapi v5 is a major update with breaking changes: flat response structure instead of data.attributes, Entity Service replaced by Document Service, and a new draft/publish mechanism via status. Without a systematic approach, migration turns into a firefight that can take weeks and cost a lot. We have completed over 20 such migrations for projects of various scales — from small blogs to complex multilingual portals with dozens of content types. Our experience lets us go from v4 to v5 without downtime or data loss. Below is a real algorithm that will save you weeks of development and reduce the risk of missed deadlines.

Key API and Service Changes

Strapi v5 introduces several fundamental changes that require careful preparation.

API Response Format Change

In v4, each item was returned inside an envelope: { data: { id, attributes: {...} } }. In v5, the structure is flat:

{ "id": 1, "documentId": "abc123", "title": "Article" } 

This breaks any frontend that accesses data.attributes.title. Without adaptation, users will see blank pages. For backward compatibility, Strapi v5 supports the environment variable STRAPI_RESPONSE_ENVELOPE=true. It makes the server temporarily return v4 format, giving you time to update the frontend without a full stop. However, this mode is not recommended for production — use it only as a transitional bridge.

Document Service vs Entity Service

All methods for working with entities have changed. Instead of strapi.entityService.findMany, use strapi.documents(...).findMany. The code below shows a typical replacement:

// v4 await strapi.entityService.findMany('api::article.article', { filters: { published: true }, populate: ['author'] }) // v5 await strapi.documents('api::article.article').findMany({ filters: { published: true }, populate: ['author'] }) 

Draft/Publish via status Instead of publishedAt

In v5, the publication status is passed as a string: draft or published. This simplifies filtering but requires updating all queries.

How to Prepare the Frontend

The most common mistake is to update only the server. The frontend stops displaying content. Here is the plan:

1. Create a compatibility layer (adapter) on the frontend that temporarily transforms v4 format to v5. For example, a flattenStrapiData function:

function flattenStrapiData<T>(item: { id: number; attributes: T }): T & { id: number } { return { id: item.id, ...item.attributes } } 

2. Enable compatibility mode in Strapi v5 (option STRAPI_RESPONSE_ENVELOPE=true) so the server temporarily returns v4 format.

3. Go through all pages and replace data.attributes with direct access.

Plugin Compatibility and Tooling

Community plugins are a bottleneck. Check compatibility in the Strapi Marketplace. If a plugin is not updated to v5, you'll need to replace it with an alternative, fork and adapt it, or temporarily disable it. On a staging environment, run npm ls | grep strapi and check each line.

Strapi provides the CLI utility @strapi/upgrade and codemods. Run in this order:

npx @strapi/upgrade major npx @strapi/codemods migrate 

Codemods automatically replace most Entity Service calls with Document Service, update hooks and imports. But manual fixes remain — especially in custom controllers and lifecycle hooks.

Our Systematic Migration Approach

Our approach combines automation with deep expertise. We have migrated projects ranging from small blogs to enterprise portals with over 50 content types. For example, on a recent multilingual portal with custom plugins and a React frontend, we reduced the migration timeline from an estimated 4 weeks to just 10 days — that's 3x faster than typical DIY efforts. The result: zero downtime, no data loss, and a fully compatible frontend within the first week.

5-Step Migration Process

1. Audit of current version and dependencies — determine scope of work.
2. Upgrade Strapi to v5 on staging — isolated environment for testing.
3. Run codemods and manual fixes — automate Entity Service replacement.
4. Test API and frontend — check every endpoint.
5. Final deployment and monitoring — with stability guarantee.

What's Included in Turnkey Migration

Below is a typical scope of work. Average project cost: $2,999 (saves 2 weeks of development time).