# Creating a new App
### Install Frappe.js
```
yarn add frappejs
```
## Webpack
You can use webpack to build your JS bundle.
Since Frappe.js use Bootstrap 4, you will need to add SASS handlers
Your `webpack.config.js` should look like:
```js
const path = require('path');
module.exports = {
entry: './index.js',
devtool: 'inline-source-map',
output: {
filename: './js/bundle.js',
publicPath: '/'
},
module: {
rules: [{
test: /\.scss$/,
use: [
{
loader: "style-loader" // creates style nodes from JS strings
},
{
loader: "css-loader" // translates CSS into CommonJS
},
{
loader: 'postcss-loader', // Run post css actions
options: {
plugins: function () { // post css plugins, can be exported to postcss.config.js
return [
require('precss'),
require('autoprefixer')
];
}
},
},
{
loader: "sass-loader", // compiles Sass to CSS
options: {
includePaths: ["node_modules", "./client/scss"]
}
}]
}]
}
};
```
## Create a basic app
### index.html
The UI for the single page app (desk) will be built inside the `body` element, so you just need to have an empty body element, and link your JS bundle in `index.html`
Sample index.html
```html
```
### server.js
Create your server file `server.js`
```js
const server = require('frappejs/server');
server.start({
backend: 'sqlite',
connection_params: {db_path: 'test.db'},
static: './'
});
```
### index.js
In your client file you will have to import all your controllers and init them.
`frappejs/client` lib will initialize your server and user interface with the Desk.
Example starting point for a to-do app:
```js
const client = require('frappejs/client');
const todo = require('frappejs/models/doctype/todo/todo.js');
// start server
client.start({
server: 'localhost:8000',
}).then(() => {
frappe.init_controller('todo', todo);
frappe.desk.add_sidebar_item('Home', '#');
frappe.desk.add_sidebar_item('New ToDo', '#new/todo');
frappe.router.default = '/list/todo';
frappe.router.show(window.location.hash);
});
```