Fastify on Azure Web App is super straightforward

Today I'll show you step by step how easy it is to deploy a Fastify server on Azure Function.

Steps to create a Fastify server

Project folder creation

mkdir azure-fastify && cd azure-fastify

Initialize npm

npm init -y

Install fastify

npm i fastify

package.json

You should find this file inside your project, it was created by npm

{
  "name": "azure-fastify",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "start": "node index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "fastify": "^4.10.2"
  }
}

I added the script to launch the Fastify server "start": "node index.js" and "type": "module"

index.js

Let's create our code for the Fastify server

import Fastify from 'fastify';
const fastify = Fastify({
  logger: true,
});

fastify.get('/', async (request, reply) => {
  return { randomNumber: Math.random() };
});

const start = async () => {
  try {
    const port = process.env.port || 8080;
    await fastify.listen({ port, host: '0.0.0.0' }, () =>
      console.log('SERVER LISTENING AT PORT : ' + port)
    );
  } catch (err) {
    fastify.log.error(err);
    process.exit(1);
  }
};

start();

Here we are creating our Fastify server which responds to the port specified in the environment variables or as an alternative to 8080.
It exposes a JSON with a random number inside.

Local Run

Through the npm run start command we can test our server locally.
Here is the local result:

Steps to deploy on Azure

Install Azure App Service extension

Once the extension is installed we will have this new icon in VSCode

Login into Azure

By pressing on the login button, we are taken to the browser to log in with our Azure account.

You need to have an Azure account, free plan works well for this example.

Once logged in you can go back to VSCode

Creation of a new Web App

We use the following command to create our application on Azure

We need to enter the name of our application

We need to select Node 18 LTS

Let's select Free pricing

The application will be created automatically

Once the application has been created, press the Deploy button

Let's select the project folder

After the deployment let's see our app on Azure

🎉 Wow! We deployed together how to create a server locally with Fastify and we deployed it via Azure 👏

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Bye 👋

Giorgio BoaFollow

Giorgio Boa is a full stack developer and the front-end ecosystem is his passion. He is also international public speaker, active in open source ecosystem, he loves learn and studies new things.