Basic API using Nodejs + Express + MongoDB (less than 100 lines of code, adds + finds vehicles)

server.js

/*
path: server.js 
*/

// Require shit
const express = require('express');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');

// Let's import our Vehicle model
let Vehicle = require('./app/models/vehicle')

// Initiate an express app
const app = express();

// Configure app for bodyParser()
// this lets us get data from the body of POST

app.use(bodyParser.urlencoded({ extended: true })) // URL encoded data
app.use(bodyParser.json()) // JSON


// Set up port for server to listen on
const PORT = process.env.PORT || 3000; // if env variable is set for port, use it. else, use 3000

// connect to DB
mongoose.connect('mongodb://localhost:27017/codealong') // 27017 is the default MongoDB port, 'codealong' will be the DB name

// API routes
const router = express.Router(); // we're gonna use Express router for routing in our API

// Routes will all be prefixed with /api/
app.use('/api', router)

// MIDDLEWARE
// Middleware can be very useful for doing validations.
// We can log things from here or stop the request from continuing 
// in the event that the request is not safe

// middleware will step in before a request gets to the route and run some process, whatever you need,
// before it moves on

// middleware to use for all requests
router.use(function(req, res, next) {
  console.log('Middleware meddled. Something is happening here..')
  next(); // we always need to call this next() so the request could move on, otherwise it wouldn't complete
});


// Test route
router.get('/', function(req, res) {
  res.json({ message: 'Welcome to our API' })
})

// ENDPOINTS
router.route('/vehicles')
  .post(function(req, res) { // create a new instance of a car based on our data (Vehicle) model
    let vehicle = new Vehicle();
    vehicle.make = req.body.make;
    vehicle.model = req.body.model;
    vehicle.color = req.body.color

    vehicle.save(function(err) {
      if (err) {
        res.send(err) // if error, send error in response
      }
      res.json({ message: 'Vehicle was successfully manufactured' }); // if not error, send a success msg
    });
  })
  .get(function(req, res) {  
    Vehicle.find(function(err, vehicles) {
      if (err) {
        res.send(err)
      }
      res.json(vehicles); // if no err, send all the vehicles back as JSON
    }) // return all vehicles
  });

router.route('/vehicle/:vehicle_id')
  .get(function(req, res) {
    Vehicle.findById(req.params.vehicle_id, function(err, vehicle) { 
      if (err) {
        res.send(err)
      }
      res.json(vehicle)
    })
  })

router.route('/vehicles/make/:make')
  .get(function(req, res) {
    Vehicle.find({make: req.params.make}, function(err, vehicle) {
      if (err) {
        res.send(err)
      }
      res.json(vehicle)
    })
  })

router.route('/vehicles/color/:color')
  .get(function(req,res) {
    Vehicle.find({color:req.params.color}, function(err, vehicle) {
      if (err) {
        res.send(err)
      }
      res.json(vehicle)
    })
  })
  
// Fire up server
app.listen(PORT)

// Print friendly msg to console
console.info(`Connected. Server listening on port: ${PORT}`)

// You should have MongoDB running in order to serve this API
// Start your app with nodemon, it 'watches' for changes, to run: nodemon server.js

vehicle.js

/*
path: app/models/vehicle.js 
*/

const mongoose = require('mongoose')
let Schema = mongoose.Schema;

// Let's make a model for a vehicle
const VehicleSchema = new Schema({ 
  // Let's add some props
  make: String,
  model: String,
  color: String
});

// export so we can pull this from some other location
module.exports = mongoose.model('Vehicle', VehicleSchema)