What are the best backend options to use with React?

Node.js (Express, Fastify, or NestJS) fits most React apps built as a single-language stack. Next.js API routes or Server Actions skip a separate backend for simpler apps. ASP.NET Core suits typed, enterprise-scale systems, and Django or FastAPI make sense when the backend also runs data science or ML work. .NET 10, released in November 2025, is a long-term-support build with security patches through November 2028.

What does this mean for your stack?

React itself doesn't care what runs behind the API. It just needs JSON over HTTP, or a GraphQL schema, delivered predictably. That's why the best backend is really the one whose contract is easiest for your frontend team to consume and debug. Node.js backends return JSON your React code already understands, with no serialization step in between. Next.js Server Actions go further: you call a server function directly from a component, and Next.js handles the request, serialization, and response for you, so there's no separate endpoint to write or maintain. Matching languages across frontend and backend also cuts context-switching for a small team, which is one reason Node.js stays a default pick even when raw performance isn't the deciding factor.

Where does each option fit?

• Node.js with Express: the simplest, most flexible choice for small to mid-size APIs, and the framework most React tutorials assume.
• Fastify: same JavaScript ecosystem as Express, built around schema-based serialization for teams that care about raw throughput.
• NestJS: adds structure, dependency injection, and TypeScript conventions on top of Node.js, useful once a codebase outgrows a handful of route files.
• Next.js API routes or Server Actions: fine for apps where the backend is mostly CRUD and auth, and you would rather not run a second service at all.
• ASP.NET Core: strong typing end to end, mature tooling, and a support timeline that suits systems built to run for years without a rewrite.
• Django or FastAPI: the practical choice when the backend also trains models, runs data pipelines, or leans on Python's ML libraries.

How do you actually decide?

Start with what the backend needs to do beyond serving your React app. If it's mostly CRUD, auth, and a database, Node.js or Next.js Server Actions will get you there fastest, especially with a small team. If the system needs to survive multiple teams and years of maintenance, ASP.NET Core's typing and tooling reduce the number of runtime surprises. If there's real data or ML work involved, Python usually wins no matter what the frontend is written in. Team familiarity matters more than any framework benchmark: a team that already knows .NET well will ship a better ASP.NET Core backend than a mediocre Node.js one, and the reverse holds just as often.