Migrate WinDev to React without turning business logic into frontend debt.
React and Next.js are strong targets for browser-first delivery, SaaS products and customer portals — not for reproducing every WinDev window pixel for pixel. A migration succeeds when the new architecture preserves behavior and boundaries, not when every window becomes a component.
When React or Next.js is the right target
- Browser-first delivery. SaaS, customer portals and API-driven products where users expect a modern web interface, not a desktop shell in a browser.
- Access to a broad talent market. React and Next.js developers are easy to hire — unlike a language one company maintains.
- Responsive by default. Interfaces that need to work across devices, not just the desktop your WinDev app was built for.
- Less about pixel parity. The goal is preserved behavior and interaction patterns that feel native to the web, not a window-for-window clone. Next.js is one of 16 stacks WXCode converts to.
What needs to be mapped, not just translated
Windows & controls → routes, components
Screens become routes, components, forms and design-system primitives — not a 1:1 window clone.
Global procedures → domain services
Business logic moves into domain services or shared libraries, decoupled from the UI layer.
Queries → APIs, server actions
Data access moves behind APIs, server actions or dedicated backend services.
Stateful desktop flows → explicit state
Long-running desktop sessions become explicit, durable client/server state — nothing stays implicit.
The architecture decision that matters most
Don't force it: Business logic doesn't have to live in React. For mature WinDev systems, separate presentation from domain behavior — a Next.js full-stack architecture suits some products, while others benefit from React paired with a dedicated .NET, Laravel or Django backend. Domain complexity, integration load and team skills decide which.
Where migrations quietly go wrong
- Hidden validation in UI event handlers. Rules that only exist as code attached to a button click, invisible until something breaks in production.
- Direct database access from screens. Desktop-era shortcuts that have no equivalent once the client and server are actually separated.
- Implicit state from long-running sessions. Desktop sessions that assumed the user never closed the window — state that now has to be made explicit.
- Report and printer behavior. Output that was never meant to run through a browser, and needs a real export service on the other end.
Questions developers ask first
Neither in isolation — pick one end-to-end workflow with real rules and data access. It should compile, run in a browser, reproduce the expected outcome, and carry tests derived from the extracted rules.
It depends on domain complexity and integration load. Some products are fine full-stack in Next.js; others need a dedicated backend. That decision comes from your codebase, not a default.
They become server-rendered documents or dedicated export services — first-class elements in the knowledge base, not a manual redo.
Related guides
Test it on your real project.
Start with the knowledge base, the dependencies and the business rules — before committing to any rewrite.