WebPlayground bootstraps simple HTML, JS, CSS files and setup live-reloading server for you.
Last updated 2 years ago by daiweilu .
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$ cnpm install web-playground 
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web-playground is command line tool for quickly creating prototypes or demos. It requires no configuration or boilerplate. It has builtin preprocessors, bundler and live reloading server. You can create JS, HTML, or CSS files you need on the fly without worrying about tooling at the beginning.

web-playground is never meant to be a tool for developing production ready app. Once the prototype proven to be worthy. You will need to switch gear. That said, web-playground provides shortcut to conveniently bundle everything into a single HTML file to you put it online wherever you want.

Only supports Node >= 4

Give it a try

npm install -g web-playground

# In the directory you want to put your prototypes
# This will create no files, and no file is required at beginning
wpg start

echo "document.write('<h1>Hack the playground!</h1>')" > js.js

You can create and edit js.js, html.html and css.css files. Your browser will update instantly. You can also add a playground.yml by running wpg init to customize the playground for your needs.


Web Playground supports a variety of preprocessors. To enable one, first run wpg init to create a playground.yml. Then uncomment the appropriate section in it. For example, to enable SCSS, add preprocessor: babel under js in playground.yml:

  preprocessor: babel

Supported preprocessors

Web Playground supports a variety of preprocessors. But only a few are builtin (babel, node-scss, and ejs). This is to speed up installation and improve start up performance.

Supported preprocessors are:

To enable supported external preprocessor, you need to run npm install <processor_package> in the same directory as playground.yml. For example:

To use Less:

  1. Run wpg init to create a playground.yml.
  2. Add preprocessor: less under css in playground.yml.
  3. Run npm install less (no -g) to have Less available in current directory (you will see a node_modules directory).
  4. Run wpg init again to create css.less or you can just create the file yourself.
  5. Run wpg start to start hacking.

CommonJS module

In js.js file, you can require npm installed modules. web-playground will bundle that for you.

# In current directory
npm install react react-dom
// js.js
var React = require('react');
var ReactDOM = require('react-dom');

class MyComponent extends React.Component {
  render() {
    return <div>Hello World</div>;

ReactDOM.render(<MyComponent />, node);

Config file

If playground.yml is available in the same directory, web-playground will load it to provide more customizations. Below is the default configurations if no playground.yml file is found.

title: Cat Playground

  #### Available - ejs, jade
  # preprocessor: ejs

  #### Available - babel, coffeescript, typescript
  preprocessor: babel

  #### These scripts will be added in appearance order and before the your js
  # external:
  #   - 'https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js'

  #### Available - scss, less, stylus
  preprocessor: scss

  #### Available - autoprefixer
  # vender_prefixing: autoprefixer

  #### Available - reset, normalize
  # base: reset

  #### These stylesheets will be added in appearance order and before the your css
  # external:
  #   - 'https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css'


Usage: wpg [options] [command]


  init              create boilerplate files in current directory
  start [options]   load config and start local server
  bundle            bundle all asserts into a single HTML file


  -h, --help                   output usage information
  -V, --version                output the version number
  -d, --target-dir <dir-name>  target different directory


Sometimes you find yourself need to put your awesome work online. You can use the bundle feature of Web Playground. Use wpg bundle flag when you want to publish your playground. It will bundle all your assets into one index.html file, which you can view just like a webpage without web-playground.

Target different directory

When you work on lots of demos, cd into each dir and start Web Playground is frustrating. You can use --target-dir option to specify a different target directory instead of current one. wpg will do exactly the same thing as if it was working on current directory. This is also very convenient when you use separately installed preprocessors or dependent modules. You will only have to install it once in wpg running directory instead of each target directory.

Existing Issues

  • CommonJS bundling only support babel as preprocessor. Need supports for CoffeeScript and TypeScript.
  • Race condition when switching between CommonJS and none CommonJS bundle. Sometime the old watcher might get loaded to browser because it's slower.
  • CommonJS require detection depends on has-require. It doesn't distinguish between code and comments.
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