NodeJS & MongoDB – create simple API

Setup Project

• mkdir <projectdir>/helloworld
• cd helloworld
• npm init
  • name:
  • version:
  • description: Hello World API
  • entry point: server.js
  • test command:
  • git repository:
  • keywords:
  • author: John Dunning
  • license:
• npm install –save express body-parser mongoose bluebird
• npm install -g nodemon
• atom .

Create server.js

[code language=”javascript”]
var express = require(‘express’);
var bodyParser = require(‘body-parser’);
var mongoose = require(‘mongoose’)
mongoose.Promise = require(‘bluebird’);

var Person = require(‘./app/model/person’);

var app = express();

// Configure app for bodyParser()
// grab data from body of POST

app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());

// Set up server port to listen on

var port = process.env.PORT || 3000;

// Connect to Database

mongoose.connect(‘mongodb://localhost:27017/people’, {
useMongoClient: true,
/* other options */
});

// API Routes

var router = express.Router();

// Routes will all be prefixed with /api

app.use(‘/api’, router);

// MiddleWare ; Validate request

router.use(function(req, res, next) {
console.log(‘MiddleWare – Validate request’);
next();
});

// Test Route

router.get(‘/’, function(req, res) {

res.json({message: ‘Welcome to the Hello World API’})

});

// Person Route

router.route(‘/person’)

.post(function(req, res) {
var person = new Person();
person.firstname = req.body.firstname;
person.lastname = req.body.lastname;
person.age = req.body.age;

person.save(function(err) {
if(err) {
res.send(err);
}

res.json({message: person.firstname+" "+person.lastname+" was successfully added"})
});
})

.get(function(req, res) {
Person.find(function(err,people) {
if(err) {
res.send(err);
}

res.json(people);
});
});

router.route(‘/person/:person_id’)
.get(function(req,res) {
Person.findById(req.params.person_id, function(err, person) {
if(err) {
res.send(err);
}

res.json(person);
});
});

router.route(‘/person/lastname/:lastname’)
.get(function(req,res) {
Person.find({ lastname: req.params.lastname}, function(err, person) {
if(err) {
res.send(err);
}

res.json(person);
});
});

router.route(‘/person/age/:age’)
.get(function(req,res) {
Person.find({ age: req.params.age}, function(err, person) {
if(err) {
res.send(err);
}

res.json(person);
});
});
// Start the server

app.listen(port);

// Print a friendly message

console.log(‘Server listening on port ‘+port);
[/code]

Create Model

• open Atom
• create folders
  •  app
  • app/model
  • app/model/person.js

[code language=”javascript”]
var mongoose = require(‘mongoose’);
var Schema = mongoose.Schema;

var PersonSchema = new Schema({
firstname: String,
lastname: String,
age: Number
});

module.exports = mongoose.model(‘Person’,PersonSchema);
[/code]

Start MongoDB

• mongod

Start the Server

• nodemon server.js

Check the Response

• open Postman
  • GET localhost:3000/api

[code language=”javascript”]
{
"message": "Welcome to the Hello World API"
}
[/code]

Postman

POST localhost:3000/api/person

• Headers
  • Content-Type
  • application/json
• Body
  • raw

[code language=”javascript”]
{
"firstname": "Jon",
"lastname": "Doe",
"age": 21
}
[/code]

Send

[code language=”javascript”]
{
"firstname": "Jane",
"lastname": "Doe",
"age": 19
}
[/code]

Send

[code language=”javascript”]
{
"firstname": "Mick",
"lastname": "Doe",
"age": 14
}
[/code]

Send

[code language=”javascript”]
{
"firstname": "Andy",
"lastname": "Doe",
"age": 8
}
[/code]

Send

GET localhost:3000/api/person

[code language=”javascript”]
[
{
"_id": "5999c4c26604ae6a1da7e1f6",
"age": 21,
"lastname": "Doe",
"firstname": "Jon",
"__v": 0
},
{
"_id": "5999c4fcd77e466a3db7b05c",
"age": 19,
"lastname": "Doe",
"firstname": "Jane",
"__v": 0
},
{
"_id": "5999c5540a3fd46a6854adca",
"age": 14,
"lastname": "Doe",
"firstname": "Mick",
"__v": 0
},
{
"_id": "5999c57b70f4b66a7b58073d",
"age": 8,
"lastname": "Doe",
"firstname": "Andy",
"__v": 0
}
]
[/code]

GET localhost:3000/api/person/5999c4fcd77e466a3db7b05c

[code language=”javascript”]
{
"_id": "5999c4fcd77e466a3db7b05c",
"age": 19,
"lastname": "Doe",
"firstname": "Jane",
"__v": 0
}
[/code]

GET localhost:3000/api/person/lastname/Doe

[code language=”javascript”]
[
{
"_id": "5999c4c26604ae6a1da7e1f6",
"age": 21,
"lastname": "Doe",
"firstname": "Jon",
"__v": 0
},
{
"_id": "5999c4fcd77e466a3db7b05c",
"age": 19,
"lastname": "Doe",
"firstname": "Jane",
"__v": 0
},
{
"_id": "5999c5540a3fd46a6854adca",
"age": 14,
"lastname": "Doe",
"firstname": "Mick",
"__v": 0
},
{
"_id": "5999c57b70f4b66a7b58073d",
"age": 8,
"lastname": "Doe",
"firstname": "Andy",
"__v": 0
}
]
[/code]

GET localhost:3000/api/person/age/14

[code language=”javascript”]
[
{
"_id": "5999c5540a3fd46a6854adca",
"age": 14,
"lastname": "Doe",
"firstname": "Mick",
"__v": 0
}
]
[/code]