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in the world of node.js web frameworks, there are several popular choices available, such as express, fastify, koa, and nestjs. each framework has its own strengths, weaknesses, and use cases. in this tutorial, we'll explore why you might consider using fastify, koa, or nestjs over express, and provide code examples for each framework.

fastify

*why use fastify?*
*performance:* fastify is designed for high performance, with a focus on speed. it can handle a large number of requests per second.
*schema-based validation:* fastify allows you to define your api schema using json schema, enabling automatic validation and serialization of requests and responses.
*plugins:* fastify has a rich ecosystem of plugins that can be easily integrated.

*example of fastify:*



koa

*why use koa?*
*modern and minimalist:* koa is designed to be lightweight and expressive. it does not bundle middleware, allowing developers to choose what they need.
*async/await:* koa uses async/await out of the box, making it easier to manage asynchronous operations.
*better error handling:* koa provides a more elegant way to handle errors with its middleware system.

*example of koa:*



nestjs

*why use nestjs?*
*scalability and structure:* nestjs is built on top of express (or fastify) and provides a modular architecture, making it suitable for large applications.
*typescript support:* nestjs is built with typescript, offering strong typing and excellent ide support.
*dependency injection:* it implements a powerful dependency injection system, making it easier to manage services.

*example of nestjs:*

1. *install nestjs cli:*


2. *create a controller:*
in `src/app.controller.ts`:



3. *run the application:*
the application can be run using:


conclusion

choosing between fastify, koa, and nestjs depends on your project's requirements:

*fastify* is ideal for performance-critical applications.
*koa* is well-suited ...

#Fastify #Koa #numpy
Fastify
Koa
NestJS
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