Hello World with Hadron

First of all, let's create a hello world route with the Hadron framework, we are going to build a simple route on / which will return 200 status and the message: Hello World in the body response.

To do it we need to init the hadron-core and hadron-express modules.

  • hadron-core:
npm install --save @brainhubeu/hadron-core
  • hadron-express:
npm install --save @brainhubeu/hadron-express express

Now we can create the file src/index.js where we are going to init Hadron:

// src/index.js
import express from 'express';
import hadron from '@brainhubeu/hadron-core';
import hadronExpress from '@brainhubeu/hadron-express';

const port = process.env.PORT || 4000;
const expressApp = express();

const config = {
    routes: {
        helloWorldRoute: {
            path: '/',
            methods: ['GET'],
            callback: () => ({ status: 200, body: { message: 'Hello World' } }),

const hadronInit = async () => {
    const container = await hadron(expressApp, [hadronExpress], config);

    expressApp.listen(port, () => {
        console.log(`Listening on http://localhost:${port}`);


Now when we run our server:

npm start

Where the start command is:

"start": "NODE_ENV=DEV nodemon src/index.js --exec babel-node",


To have a working command as above, we need to install some dependencies:

npm install --save-dev nodemon babel-cli babel-preset-env babel-preset-stage-3

And also install babel-node globally:

npm install -g babel-node

Next you need to configure babelrc, create a file in main directory called .babelrc:

    "presets": [

Now you should be ready.

We should see:

Hadron Init Terminal

And when we enter http://localhost:4000/, we should receive the hello world message from our server:

    message: "Hello World"