# Node.js

## NPM

Whenever creating a new node project, use to set it up

```
npm init
```

[NPM](https://www.npmjs.com/) is a package manager for node.js and js libraries and frameworks.  You can look up packages there, and install them for your project with:

```
npm install package-name --save
```

## module.exports/require

Traditionally, importing JS files into other JS files has not been supported... until now!  There are several ways to do this, but node allows you to add things the to module.exports object.

```javascript
module.exports = 'foo';
```

Whatever is on there, will be the return value of

```javascript
require('yourJSFile.js');
```

You can assign this to a variable to use later

## Instantation

First require express:

```javascript
var express = require('express'); //include express package
```

`express` has lots of abilities, but we just want to start up a server app:

```javascript
var app = express(); // create an express app
```

Then make it listen on a port

```javascript
app.listen(3000, function(){ //start the server
	console.log('listening on port ' + PORT);
});
```

## CRUD and HTTP Verbs

In comp sci, there are different kinds of action you can take on data

- create
- read
- update
- destroy

There are different kinds of 'methods' you can use to make a request to a server that map to these actions:

- post (create)
- get (read)
- put/patch (update)
- delete (delete)

PUT is for updating an entire model, PATCH is for changing just a few attributes

## Routing

Basic routing can be done at the app level

```javascript
app.get('/', function(req, res){ // route for /
	res.send('hi'); //respond with 'hi'
});
```

This sets up an event listener for any GET request that comes into the server with the path of `/`.  Give it a callback function which takes a request variable and a respond variable.  Each of these have different methods/properties which we'll learn about

## MVC
## Views
## Params/Query Strings
## REST
## Middleware
## Body Parser
## Method Override
## Database
## Static