NestJS and Next.js are not rivals. NestJS is a framework for server-side Node.js applications: controllers, modules and dependency injection for APIs. Next.js is a React framework for building web pages, with Route Handlers for light backend work. Small apps can live entirely in Next.js; larger systems often put a NestJS API behind a Next.js front end.
| Question | NestJS | Next.js |
|---|---|---|
| Main job | Server-side applications and APIs | React websites and web apps |
| Renders pages? | No, it returns data | Yes, Server and Client Components |
| Language | Built with TypeScript, JavaScript allowed | JavaScript or TypeScript |
| HTTP layer | Express by default, Fastify optional | Its own server via next start |
| Endpoint style | @Controller class with @Get methods | route.ts exporting GET, POST and so on |
| Start a project | nest new project-name | npx create-next-app@latest |
| Default local port | 3000 | 3000 |
Updated
Below is one endpoint, a list of cats at GET /cats, written as a NestJS controller and as a Next.js Route Handler. Switch examples to see a POST route and the setup that lets a Next.js page call a NestJS API.
// cats.controller.ts
import { Controller, Get } from "@nestjs/common";
@Controller("cats")
export class CatsController {
@Get()
findAll() {
return [{ id: 1, name: "Tom" }];
}
}// app/cats/route.ts
export async function GET() {
return Response.json([{ id: 1, name: "Tom" }]);
}In NestJS the @Controller('cats') prefix and @Get() build the path, and the controller is registered in a module. In Next.js the folder path is the URL and the exported function name is the method.
Installs the Nest command line tool, creates the API, then creates the site in a sibling folder.
npm i -g @nestjs/cli
nest new api
npx create-next-app@latest webNestJS describes itself as a framework for building efficient, scalable Node.js server-side applications. It organises code into modules, controllers and providers and wires them together with dependency injection, which keeps a large API consistent across many developers.
Under the hood it runs on Express by default. Swapping in the @nestjs/platform-fastify adapter changes the HTTP layer without rewriting your controllers, although Express-specific middleware then needs a Fastify equivalent.
Next.js renders React on the server, routes by folder and file names, and ships only the interactive parts to the browser. Its Route Handlers are enough for form posts, webhooks and small JSON endpoints that belong to the same site.
What it does not try to be is a structured backend for other clients. There is no module system or dependency injection, so a big API built only from route files tends to drift.
The common split is Next.js for every page and NestJS for business logic and data. Next.js Server Components fetch from the NestJS API on the server, so secrets and internal URLs never reach the browser, and Client Components call it only when they must.
For a small app, often yes. Route Handlers cover GET, POST, PUT, PATCH, DELETE, HEAD and OPTIONS with the Web Request and Response APIs. NestJS earns its place when the backend grows: many modules, background jobs, several clients such as mobile apps, and a team that wants enforced structure.
It is not built for that. NestJS returns data, with objects serialized to JSON by default. Use Next.js, or another front-end framework, for the pages.
NestJS is built with TypeScript and fully supports it, and the docs say you can still write plain JavaScript. Almost every example and guide uses TypeScript, so expect to use it.
A monorepo with two apps and a shared types package works well for one team. Separate repositories suit separate teams with their own release schedules.
If you want to put a website online, start with Next.js. Learn NestJS when you are building an API that several front ends or services depend on.
Related: Next.js API routes, Express.js tutorial, CORS explained, Next.js vs Node.js, HTTP status codes.
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