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Express-Node Back-endBuilding a simple back-end application with Express, Node, and MongoDB

Need for back-end•Back-end will connect to a DB, get some results, and do some processing with those results •Back-end will save data to the DB•Back-end will expose REST API that front-end will use to interact with the DB•Back-end will accept HTTP requests from front-end app and use CRUD operations to interact with the DB

Using Express for back-end app•Express is a minimal and flexible web application framework for Node.js•Express provides a robust set of features for web and mobile applications•Express provides a myriad of HTTP utility methods and middleware for creating a robust API quickly and easily

Setting up back-end app•Install express-generator globally> npminstall express-generator -generator•Change directory to where you which to create your back-end application> express ContactsAppBackend•This will generate all the boilerplate code and directory structure that you need to create an express application

Install missing modules•install express locally and save it to your manifest> npminstall express --save•Install all your dependency modules> npminstall•start your express application> npmstart

Structure of app•Survey app.jsand ./bin/www.Fix a few linter errorsoapp.jsis the brain of the applicationoPort number for the application is assigned in ./bin/www•Explore package.jsonmanifestonpmstart script runs ./bin/www as node application•Folder structureoviews-back-end views, ideal for documenting apioroutes-route controllers for processing http requests. This is where most of the work will be done opublic-public artifacts (images, css, etc) will be stored there

Setup mongoDB•Since the application is going to interact with a DB, we need to setup the DB•In a terminal start the mongo daemon> mongod•MongoDB will stat on port 27017. •In another terminal start the mongo shell and create our contactsappdb> mongo> use contactsappdb

Setup app to connect to mongoDB•We need to setup Mongoose to use mongoDB.oMongoose provides mongodbobject modeling for node.jsoMongoose provides a straight-forward, schema-based solution to model your application data. oIt includes built-in type casting, validation, query building, business logic hooks and more.•Setting up Mongoose:ocreate a folder called modelin ContactsAppBackendocreate a new file called ContactsAppBackend/model/db.jsoplace our dbconnection code in db.js•Create a variable in app.jsthat points to our db.jsfile

Wiring up more pieces•We need to install the modules that are missing> npminstall mongoose --save > npminstall method-override --save•Our app should still work when we run npmstart•Now we need to create our model and schemaoThis will be done in a new file in ContactsAppBackend/model/oLet's call it contact.js. oEach contact is going to have a firstName, lastName, email, homePhone, cellPhone, birthDay, website, address.oIn app.jscreate a variable at the top, below our dbvariable we added earlier, that points to contact.js

Onto route controllers•Now we need to create the route controllers for our REST API•Add these lines in app.jsto reference and use the route controllersvarroutes =require('./routes/index');varcontacts =require('./routes/contacts');// ANDapp.use('/', routes);app.use('/contacts', contacts);

Let the fun begin!•We're going to build our entire controller with all the CRUD and REST pieces completely baked in•We are going to take this piece by piece, but all of this will go into the routes/contacts.jsfile

Getting all contacts•We are going to build the GETAPIfor grabbing all the Contacts from the database •We can choose to display all the contacts in a backend view or send a JSON response to the client•We can also build the POST API for creating a new Contact•We will write and test code to do these in routes/contacts.js

Inserting data in DB•In the mongo terminal create a contacts collection and insert a contact in it•Enter the following command in the terminal> db.contacts.insert(... {... "firstName": "John",... "lastName": "Doe",... "email": "john.doe@email.com"... });

Getting contact by id•After testing getting all contacts API, we are now ready to get contacts by id•First, we need route middleware to validate idrouter.param('id', function(req, res, next, id) {...});•After validating the id, we need to GET an individual contact to display or return to the client

Setup to get contact by idrouter.route('/:id').get(function(req, res) {...});

Other CRUD operations•We will use PUTto updatea contact. oPUT and POST do similar things oThe difference here is that PUT first finds the contact and edit instead of creating a new contact•DELETEis a crucial operation that can also be supported by using the REST API•We would add views here if we did not have a front-end application •We need to update our front-end application to consume the newly created REST API

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