Getting Started

Last updated 02-13-2016

The goal of Nxus is to make building interactive, data-rich web apps as easy as possible. Specifically, we want to create a re-usable foundation of common components which can be easily reused, leaving you with more time to focus on the unique code for your project.

This guide walks you through creating a Nxus app from the ground up. By the end, you'll have a good understanding of how Nxus saves you time, and how you can get started with Nxus on your next project.

Getting set up

This guide assumes you have the following installed on your system:

  • Node 4.x
  • NPM
  • MongoDB

If you don't you can install them easily using Homebrew

> brew install nvm mongodb && nvm install 4.2.1

Step 1: Creating your Nxus project

First, create an empty project called nxusProject.

> mkdir nxus-project

Next, go into the directory and initialize npm

> cd nxus-project
> npm init

You can accept all the default options, or supply your own. Now you should have a file called package.json in your project folder.

Step 2: Install @nxus/core

The @nxus/core module is the base of any Nxus application, and is the first thing you'll install.

> npm install @nxus/core --save

Now, create a new file called index.js and paste in the following code:

var Application = require('@nxus/core').Application;
var app = new Application();

That's it, you've just created your first Nxus app! Now, go back to the command line and run

> node index.js

and you should see the following:

Step 3: Adding Routes

Though you can use Nxus for everything from Mobile apps to IoT devices, we're making a web app, and every web app needs routes. Nxus uses ExpressJS for basic routing, through the @nxus/router module. So let's install that.

> npm install @nxus/router --save

Now, run the app again with node index.js and you'll see some new output:

debug: Starting app on port: 3000

This means the app is listening on localhost:3000. Enter this into your browser and you'll see something like [[insert screenshot]]

This means its working. Now let's create a route to render a page. Create a new directory in your project called modules

> mkdir modules

Now in modules, create a new directory called homepage with a file inside called index.js.

> cd modules
> mkdir homepage
> cd homepage
> touch index.js

Open modules/homepage/index.js and paste in the following code.

module.exports = function(app) {
  app.get('router').route('get', '/', function(req, res) {
    res.send('Hello world!');

Let's break this down. Every module is a function or class that accepts an app object. The app object is the core application, and how you interact with every other component in Nxus. Since we want to define a route, the first thing we do is get the router module, using app.get('router'). To define our route, we call the route method, passing in an HTTP param ('get'), a path ('/') and a handler function. This handler uses the ExpressJS style res, res signature. Finally, we return our text for the route res.send('Hello world!').

Now, let's run the app and see what it looks like.

> cd ../../
> node index.js

If everything went well, you should see the same log with no errors. If you go to localhost:3000 in your browser, you'll see the following:

Step 4: Adding Basic UI

Ok, now the fun starts. Every web app needs a good UI, and text isn't going to cut it. So let's install the @nxus/base-ui module.

> npm install @nxus/base-ui --save

Now, in the modules/homepage/index.js file, change the code to the following:

module.exports = function(app) {
  app.get('router').route('get', '/', function(req, res) {
    var content = {content: 'Hello World', title: 'Welcome to Nxus'}; 
    return app.get('templater').render('page', content).then(res.send.bind(res));

Run the app again using node index.js and go to localhost:3000. Now you'll see quite a lot is different.

The @nxus/base-ui package does a lot behind the scenes, installing a couple of other handy modules @nxus/renderer and @nxus/templater.

Instead of return raw text, we're going to use a template called page to render the page. Templater:render() returns a promise, which we send the output to res.send().

If you go to localhost:3000/somepage you'll also see that @nxus/base-ui adds a 404 page (and a 500 page if something goes wrong).

Step 5: App Administration

Almost every web app requires some kind of administration UI. This is either to manage users, upload data or simply to configure user settings. Nxus makes building an Admin UI simple with the, wait for it, @nxus/admin-ui module.

Back in your project folder, run the following command:

> npm install @nxus/admin-ui --save

Now, if you start the app with node index.js, you'll notice more output in the console. To test the admin module, go to localhost:3000/admin in your browser. You'll see the following:

This is the basic admin interface with a simple homepage. Let's add our own settings page.

Create a new folder in the modules directory calls settings, and then a file called index.js. Now edit modules/settings/index.js and add the following code:

module.exports = function(app) {
  app.get('admin-ui').adminPage('Settings', '/settings', 'My Settings');

Now if you go back to localhost:3000 in your browser, you'll see there is a new menu item called Settings. Click on it, and you'll see your brand new settings page.

Step 6: Adding users and authentication

What's us is an administration interface if anyone can access it? Well, let's add some users and authentication to our Nxus app.

Normally, at this point you'd have to define a user model, add in authorization middleware, and create a bunch of views like login/profile. But we've done all that for you with the @nxus/users module. So let's install it! At least a few hours of work (if not days!) to get it all running and tested.

> npm install @nxus/users --save

Now, start the app with node index.js and you'll see a lot more going on in the app.

Specifically, look for the line at the end of the console output that looks like

> default user created with password XXXXXX

Now go back to your browser and try localhost:3000/admin. You should see a login screen. Enter in the username and password from your console. Now you should be redirected to localhost:3000 and logged in! Go back to localhost:3000/admin.

You should see a new menu item called Users. If you click on this, you'll find a complete section for creating, editing and deleting users.

Nxus In Depth

Now that you have a basic understanding of Nxus and how to build an app, you'll want to take a look at these additional guides and resources.