Express VS fastify

You have some familiarity with the Express framework. If not, familiarize yourself with the basics using this example application.

If you need to send them a fully-runnable server, something that can be executed and that can listen for incoming HTTP requests, then you probably want something like Express.js, which is a Node HTTP server framework. Serverside JS isn't like PHP in that the actual HTTP request/response flow is abstracted away from you; you have to actually handle it yourself.

Express

Node.js (express.js and nest.js)

In regards to your actual question, here you go: https://expressjs.com/

Express.js for the web framework

Looking at some popular JavaScript projects on GitHub, I noted that react, moment, and express all use single quotes for strings. However, another popular project, tslib, uses double quotes 🙄. So, while it would seem that single quotes is more common, this metric is not entirely conclusive.

We'll also need to create a simple Node.js Express application to render the frontend. Create a file named frontend.js in your repl and add the following code to it:

Why did I choose Fastify?

You would have to start a HTTP server (Make one easily ExpressJS or Fastify). You can refer to their documentation on how to setup a route (GET with query parameters or POST with a JSON body is fine for recieving information from the frontend) which when called, will execute code (This is your backend code, meaning you can execute CLI commands and so on).

Fastify is a Node.js web framework for building HTTP APIs. It is designed to be easy to use, and to be fast. It has a powerful plugin architecture inspired by Express and Hapi. It is design with developper experience in mind without sacrificing performance.

Express.js, with its long-lived version 4 is famous for its somewhat low performance. Other projects like fastify or polka have benchmarks outperforming Express.js. I don’t know why Express is slower, maybe because of regex processing of routes? If you’re using parametric routes like /users/:userid/entity and have no regexp routes, then replacing Express.js with fastify or polka will add a performance boost to your app. They are not direct replacements, but you can convert code if you really need that boost. In the article below benchmarks shows huge improvement, but in reality, your code will be a limiting factor to your app performance, and you are unlikely notice any improvement.

I suggest to start explain how it is work in real project from main.ts file. For routing I like to use fastify. But for example we will use architecture with repositories > handlers layers. For real project you need to use repositories > services > handlers layers for easier code maintainability in future. All repository calls need to be proxied by services, no direct calls repositories in handlers must not be.

Under the hood, Nest makes use of Express, but also, provides compatibility with a wide range of other libraries, like e.g. Fastify, allowing for easy use of the myriad third-party plugins which are available.