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Migration from jQuery or legacy React to modern React or Next.js, page by page

Migration from jQuery or legacy React to modern React or Next.js, page by page

Software and apps · delivered in 4-21 days

Your interface still relies on jQuery, ageing class components or a dated Next.js build, and simple edits take too long. We rebuild it in modern React or Next.js with TypeScript, converting one page at a time so the live product never stops working.

Plenty of products still earn revenue despite a front end that has become difficult to touch: jQuery scattered through templates, React class components written long ago, or a Next.js app stuck on an older router. Rewriting everything in one go would pause the product for a long stretch. Instead we run the old and new code together and shift pages across one at a time, so your users never see a single disruptive cut-over.

We have handled this kind of work before under a non-disclosure agreement, moving a jQuery front end to React screen by screen while the business kept trading.

What each package covers

The Starter package delivers the groundwork: we study your current front end, map its pages and shared elements, flag the risks, and convert one small page as a working example of the approach. The Standard package extends this to up to three pages or screens. The Advanced package covers up to eight pages, builds any shared components they rely on, and adds TypeScript types for the data plus tests for the key flows.

What changes and what does not

Your backend, your web addresses and the behaviour your users expect all stay the same. What changes is how the code is structured, so future features only need writing once. For 14 days after delivery, we correct anything that does not match what was agreed, at no extra charge.

The sequence of pages and the overall plan are settled in writing within the order conversation, no calls needed. Every migrated page is shipped on its own, with a written update each working day.

How the project runs

First, we review the existing templates, scripts and components, listing the pages, the shared pieces and anything risky such as global state or inline scripts. Next we agree a written plan covering which page moves first, what travels with it, and how both code bases coexist. We then set up the new React or Next.js code alongside the old one, with routing that directs each page to whichever version currently owns it. Pages are rebuilt one by one, checked against the old version and switched over individually, so any issue touches a single page rather than the whole product. At handover you receive the migrated pages, an updated plan for what remains, and a short note on the patterns to follow for the pages still to come.

What happens after you buy

Your order opens its own thread here the moment it is paid, and everything about that order - questions, changes and the final report - happens in it.

Questions people ask

Why not rewrite everything at once?

A single large rewrite would leave the product frozen for months and put all the risk on one release. Moving page by page keeps each step small, testable and easy to reverse if needed.

Will my URLs and search rankings change?

Addresses stay the same. With Next.js, new pages reach the browser as ready-made HTML, built on the server or at build time, so search engines read the content much as before. React with Vite renders in the browser instead, so for pages that attract search traffic we suggest Next.js.

Can you add TypeScript at the same time?

Yes. Pages we migrate are written in TypeScript, while untouched sections continue running as plain JavaScript until their turn arrives.

Our backend is PHP. Is that a problem?

That is not an issue, since the work only touches the front end. Where your backend already exposes endpoints for the data a page needs, the new page simply uses them. If that data currently only exists as HTML rendered by PHP, the plan lists the small JSON endpoints required, and we agree together who builds them before that page is moved.

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