React.js vs Next.js: what to choose before you hire

React.js is the UI library. Next.js is the product frame.

React.js is how you build interactive interfaces: buttons, forms, dashboards, the parts users click. It does not, by itself, decide how pages are loaded, how SEO works, or how APIs are hosted.

Next.js is a framework on top of React.js. It gives you routing, server rendering, API routes, and production defaults that matter for marketing sites, SaaS apps, and anything Google should be able to read.

When React.js alone is enough

• An internal tool behind login, where SEO does not matter.
• A widget embedded in an existing product.
• A team that already has a backend (NestJS, Django, Rails) and only needs a SPA.

When Next.js is the better default

• Public pages you want indexed: landing, blog, docs, pricing.
• SaaS products that mix marketing + authenticated app.
• You want one TypeScript codebase for UI and some backend endpoints.

This site—faizan.codes—is a Next.js product for that reason: content must be crawlable, and the contact flow has to be fast.

Questions to ask a React.js developer

1. How do you keep server data and client state from duplicating?
2. What happens to a form if the API is slow or fails?
3. How do you structure a dashboard so a new page does not copy-paste 400 lines?
4. Can you ship this with tests on the money path (login, checkout, permissions)?

React Native is not the same as React.js

React Native uses React ideas for iOS and Android. It is the right conversation when you need a mobile app. It is the wrong substitute if you only need a web product. A full stack developer should be able to explain which one you actually need.

My default for business products

I use React.js for the interface, Next.js when the product needs SEO or a unified app, and NestJS / Node.js / Python on the server when the domain logic is heavy. Mobile work uses React Native when the brief calls for it.

If you are hiring for a React.js or Next.js build, message me with the product goal—not a shopping list of libraries. I will tell you what is necessary.