Node Express example

server.js

'use strict';

const mongoose = require('mongoose');
const morgan = require('morgan');
const bodyParser = require('body-parser');

const app = require('express')();
const port = 8000;

/** Mongoose Schema setup */
const Schema = mongoose.Schema;

const ToDo = mongoose.model(
  'ToDo',
  new Schema({
    title: { type: String },
    completed: { type: Boolean },
  })
);

/** Mongo Connection */
mongoose
  .connect(mlabUri)
  .then(() => {
    console.log('Connected to mongo');
  })
  .catch(error => {
    console.error(`Initial Mongo connection error: ${error}`);
  });

/** App setup */
app.use(morgan('combined'));
// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }));
// parse application/json
app.use(bodyParser.json());

/** Routes */
app.get('/getOne', (req, res, next) => {
  ToDo.findOne(req.query, (err, doc) => {
    if (err) {
      next(err);
    }
    if (!doc || doc.length < 1) {
      console.warn('No document found');
      return res.sendStatus(404);
    }
    res.send(doc).status(200);
  });
});

app.get('/getMultiple', (req, res, next) => {
  ToDo.find(req.query, (err, docs) => {
    if (err) {
      return next(err);
    }
    if (!docs || docs.length < 1) {
      console.warn('No documents found');
      return res.sendStatus(404);
    }
    res.send(docs).status(200);
  });
});

app.post('/addOne', (req, res) => {
  // make sure title is passed to the POST request.
  if (!req.body.title || typeof req.body.title !== 'string') {
    return res.status(400).send('Title not passed or not a string');
  }
  const title = req.body.title.toLowerCase();
  const completed = req.body.completed ? req.body.completed.toLowerCase() : undefined;

  const todo = new ToDo({
    title: title,
    completed: completed && (completed === 'true' || completed === 'false') ? completed : false,
  });

  todo.save((err, todo) => {
    if (err) {
      return next(err);
    }
    res.send(`ToDo created: ${JSON.stringify(todo)}`).status(201);
  });
});

app.put('/updateOne', (req, res, next) => {
  ToDo.findOneAndUpdate(req.query, req.body, (err, doc) => {
    if (err) {
      return next(err);
    }
    if (!doc || doc.length < 1) {
      console.warn('No document found');
      return res.sendStatus(404);
    }
    res.sendStatus(200);
  });
});

app.put('/updateMultiple', (req, res, next) => {
  ToDo.find(req.query, (err, docs) => {
    if (err) return next(err);
    if (!docs || docs.length < 1) {
      console.warn('No document found');
      return res.sendStatus(404);
    }
    ToDo.updateMany(req.query, req.body, (err, doc) => {
      if (err) return next(err);
      res.sendStatus(200);
    });
  });
});

app.delete('/deleteOne', (req, res, next) => {
  ToDo.findOneAndRemove(req.query, (err, doc) => {
    if (err) return next(err);
    if (!doc || doc.length < 1) {
      console.warn('No document found');
      return res.sendStatus(404);
    }
    res.send(doc).status(200);
  });
});

app.delete('/deleteMultiple', (req, res, next) => {
  ToDo.find(req.query, (err, docs) => {
    if (err) return next(err);
    if (!docs || docs.length < 1) {
      console.warn('No document found');
      return res.sendStatus(404);
    }
    ToDo.deleteMany(req.query, (err, doc) => {
      if (err) return next(err);
      res.sendStatus(200);
    });
  });
});

/** Error Handler */
app.use((err, req, res, next) => {
  return res.status(500).send(err.stack || err);
});

/** Start app */
app.listen(port, () => {
  console.info(`App listening on port ${port}`);
});