Glossary · Web & App Development
NestJS
Overview
What NestJS is
NestJS is a Node.js framework for building server-side applications, written in TypeScript and organized around modules, controllers, and providers. It uses dependency injection and a decorator-based structure inspired by Angular, and runs on top of a proven HTTP engine—Express by default, or Fastify for higher throughput. The result is a consistent, opinionated architecture that teams can share.
Why teams choose NestJS
Plain Node and Express are flexible but unopinionated, which can lead to inconsistent code as projects grow. NestJS supplies structure out of the box: clear separation of concerns, built-in support for testing, validation, GraphQL, WebSockets, and microservices. That makes it well suited to larger APIs and enterprise applications where multiple developers need to work in the same codebase predictably.
How an agency uses NestJS
For backend development and app backend and API development, NestJS is a strong default when a project is expected to scale in scope or team size. Its modular design keeps features isolated and testable, which lowers long-term maintenance cost. An in-house team can hand a NestJS codebase between developers without the architecture drifting over time.
Where we use it
Related Zen in Tech services
How our team puts NestJS to work in real projects.
FAQ
NestJS — common questions
NestJS vs Express — what's the difference?
Express is a minimal, unopinionated library you assemble yourself; NestJS is a full framework that runs on top of Express (or Fastify) and adds structure, dependency injection, and built-in tooling. Choose Express for small, simple services and NestJS for larger, team-based applications.
Is NestJS good for microservices?
Yes. NestJS has first-class support for microservices, with built-in transport layers for TCP, Redis, gRPC, Kafka, and more, plus tools for message-based communication. It is a common choice for structured, service-oriented Node.js backends.
Do I need to know TypeScript to use NestJS?
Effectively, yes. NestJS is built for TypeScript and its patterns rely on decorators and types. You can write plain JavaScript, but you lose most of the framework's advantages, so TypeScript is strongly recommended.
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