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This repository was archived by the owner on Mar 9, 2025. It is now read-only.

Example Node Server w/ Babel

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Getting Started

First we'll install@babel/cli,@babel/core and@babel/preset-env.

$ npm install --save-dev @babel/cli @babel/core @babel/preset-env

Then we'll create a.babelrc file for configuring babel.

$ touch .babelrc

This will host any options we might want to configurebabel with.

{"presets": ["@babel/preset-env"]}

Then create our server inindex.js.

$ touch index.js
importhttpfrom'http';constserver=http.createServer((req,res)=>{res.writeHead(200,{'Content-Type':'text/plain'});res.end('Hello World\n');}).listen(1337,'127.0.0.1');console.log('Server running at http://127.0.0.1:1337/');exportdefaultserver;

With recent changes to babel, you will need to transpile your ES6 before node can run it.

So, we'll add our first script,build, inpackage.json.

  "scripts": {+   "build": "babel index.js -d dist"  }

Then we'll add ourstart script inpackage.json.

  "scripts": {   "build": "babel index.js -d dist",+   "start": "npm run build && node dist/index.js"  }

Now let's start our server.

$ npm start

You should now be able to visithttp://127.0.0.1:1337 and seeHello World.

Watching file changes withnodemon

We can improve ournpm start script withnodemon.

$ npm install --save-dev nodemon

Then we can update ournpm start script.

  "scripts": {    "build": "babel index.js -d dist",-   "start": "npm run build && node dist/index.js"+   "start": "npm run build && nodemon dist/index.js"  }

Then we'll restart our server.

$ npm start

You should now be able to make changes toindex.js and our server should berestarted automatically bynodemon.

Go ahead and replaceHello World withHello {{YOUR_NAME_HERE}} while ourserver is running.

If you visithttp://127.0.0.1:1337 you should see our server greeting you.

Getting ready for production use

First let's move our serverindex.js file tolib/index.js.

$ mkdir lib$ mv index.js lib/index.js

And update ournpm start script to reflect the location change.

  "scripts": {-   "build": "babel index.js -d dist",+   "build": "babel lib -d dist",    "start": "npm run build && nodemon dist/index.js"  }

Next let's add a new task:npm run serve.

  "scripts": {    "build": "babel lib -d dist",    "start": "npm run build && nodemon dist/index.js",+   "serve": "node dist/index.js"  }

Now we can usenpm run build for precompiling our assets, andnpm run servefor starting our server in production.

$ npm run build$ npm run serve

This means we can quickly restart our server without waiting forbabel torecompile our files.

Oh, let's not forget to adddist to our.gitignore file:

$ touch .gitignore
dist

This will make sure we don't accidentally commit our built files to git.

Testing the server

Finally let's make sure our server is well tested.

Let's installmocha.

$ npm install --save-dev mocha

And create our test intest/index.js.

$ mkdirtest$ touch test/index.js
importhttpfrom'http';importassertfrom'assert';importserverfrom'../lib/index.js';describe('Example Node Server',()=>{it('should return 200',done=>{http.get('http://127.0.0.1:1337',res=>{assert.equal(200,res.statusCode);server.close();done();});});});

Next, install@babel/register for the require hook.

$ npm install --save-dev @babel/register

Then we can add annpm test script.

  "scripts": {    "start": "nodemon lib/index.js --exec babel-node",    "build": "babel lib -d dist",    "serve": "node dist/index.js",+   "test": "mocha --require @babel/register"  }

Now let's run our tests.

$ npmtest

You should see the following:

Server running at http://127.0.0.1:1337/  Example Node Server    ✓ shouldreturn 200  1 passing (43ms)

That's it!

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