Creating Your First ‘Hello World’ Application with Fastify

Hello, I am Charu from Classmethod. I have recently started using Fastify in my projects so I thought of writing the basic start in a blog.

Introduction

If you got interested in this blog, then I am sure you are familiar with Node.js development, also you know a bit about Express or have worked with it. Well, Fastify is a NodeJS framework used for backend web development. It is mainly know for it's speed, efficiency, and developer experience.

Alongside, we'll explore TypeScript, a superset of JavaScript, renowned for its robust typing system and suitability for large-scale applications.

Prerequisites

Setting Up Your Project

Getting started with the code

const fastify = require("fastify")({ logger: true });

fastify.get("/", async (request: any, reply: any) => {
  return { greeting: "Hello from Fastify and TypeScript!" };
});

const start = async () => {
  try {
    await fastify.listen({ port: 8888 });
  } catch (err) {
    fastify.log.error(err);
    process.exit(1);
  }
};

start();

The code above demonstrates a basic Fastify server with TypeScript that listens on port 8888. It defines a single route that responds to GET requests on the root path with a JSON greeting message. The fastify.listen({ port: 8888 }) call makes the Fastify server listen for incoming connections on port 8888. If there's an error starting the server, the error is logged, and the process exits with a status code of 1. Finally, the start function is called to start the server.

"scripts": {
    "build": "tsc",
    "start": "node dist/source.js",
}

"compilerOptions": {
        "target": "es2018",
        "module": "commonjs",
        "moduleResolution": "node",
        "outDir": "./dist",
        "esModuleInterop": true,
        "strict": true,
        "skipLibCheck": true,
    },

npm run build

npm run start

This was a basic example for your to start with Fastify. Hope you found it useful.

Thank you for reading!

Happy Learning:)