1.0.0-beta6 • Public • Published


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Base extension for simple web applications built with Roc. Uses mainly Koa and Webpack internally.

How to build an application

First make sure to install roc by npm install -g roc and then following the main steps at Basic web application.

After these steps you should have roc available globally and be in the directory of your newly generated project that uses roc-web.

When creating an application based on roc-web you use createServer API. It returns an object that has a start method on it that can be invoked to run the application.

Simple Example

import { createServer } from 'roc-web/app';
const server = createServer({
    serve: 'static',
    favicon: 'static/favicon.png'

This example code should be similar to what you now already have in your project.
The application can be configured through the use of a roc.config.js file as well as passing options in the API functions. Please look at the JSDoc for the complete interface.


Koa middlewares

It's possible to add middlewares to the Koa server that is created in multiple ways. One way is to add them directly to the server instance that createServer returns. Another way is to use roc.config.js using build.koaMiddlewares by giving the path to a module that returns an array of middlewares and is given the configuration object as a parameter. By default Roc will add some common middlewares for you but if you don't want to use them you can override that by setting build.useDefaultKoaMiddlewares to false. Roc uses the koa-static internally always as long as createServer is used.


By default these middlewares will be included always:

  • koa-helmet
  • koa-etag

If the favicon option is set in roc.config.js.

  • koa-favicon

If building a production build.

  • koa-compressor
  • koa-accesslog

If building a non-production build.

  • koa-logger


// koa-middlewares.js
import hello from 'koa-hello-world';
export default function middlewares(/* config */) {
    return [hello()];

Restart Server in Dev Mode

You can restart the server when running the application in development mode by typing rs in the terminal window and hitting enter.


roc.config.js is a powerful way to configure a Roc project. You can use it to override default configuration and also extend or override the builder used to create the application.


By default all Roc extensions can add configuration options that will be used throughout their internal code. Most often they also define sane defaults for this configuration. In some cases one will want to fine tune them or in other cases it's expected that the user must provide something. This can be done by providing a config object from the roc.config.js file that matches the required options in the extension.

The best way currently to see what options are available in an extension is to look at the roc.config.js file that contains the defaults and it's associated roc.config.meta.js containing descriptions on what the different options do. Both of these files can be found in src/roc/config. It is also possible to use the Roc CLI to list the available options, their defaults and descriptions. You do this by running either $ roc dev --help or $ roc build --help.

Example configuration

modules.exports = {
    config: {
        port: 80


  • The code will be bundled with Webpack and so __dirname will not work for example.
  • The paths given above to serve and favicon will be evaluated from where you start the application and the folder name itself will not be needed in the URL. Like in the above example the path to the favicon.png would be http://host/favicon.png


It is possible to override and extend the builder implemented in a Roc extension that is used by the Roc CLI. This could be useful for adding some extra logic to the build or manually merging two Roc extensions together.

To do this you will need to define a createBuilder function that is exported from roc.config.js. This should follow the same interface as normal, please see the documentation for this.


const rocWebBuilder = require('roc-web').createBuilder;
modules.exports = {
    createBuilder: function(target) {
        const { buildConfig, builder } = rocWebBuilder(target);
        // Extend the buildConfig in some way if needed
        // …
        return {

Get started developing on Roc stack itself (advanced users only)

There are some examples in examples/ that shows how roc-web can be used directly. To test them out you will need to run npm link to connect them to your checked out version of roc-web.

  1. Run npm install in the base of roc-web.
  2. Run npm link in the base of roc-web.
  3. Run npm run build -- --watch in the base of roc-web.
  4. Go to the example you want and run npm link roc-web.
  5. Using the roc-cli run roc dev to get started. Some example may need some extra parameters set to roc-dev


When creating an application based on roc-web one can use the node dependencies used in this project. This means that you can import them as you would do if you had installed them inside your application.

Some of what is available

For a complete list look at the package.json in the root of this project.


To create an roc extension on top of roc-web one needs to extend the API. More information will be added here but for now one can look at the ESDocs.



npm i roc-web

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