MongoDB

A No-SQL database that offers free hosting. Typically the hobbyist’s go-to solution for Db’s. Offers a very nice Node.js driver.

Example

The following is an example Node.JS controller, using MongoDB. The controller simply extracts user input from the request body, then inserts it into the users collection.

const coll = require("../db.js")
				.db("Medicare")
				.collection("users");
const { query, body, validationResult } = require('express-validator');

// A controller function for registering a new user
exports.register = async (req, res) => {
	/* NOTE: AN ACTUAL CONTROLLER SHOULD VALIDATE USER INPUT.
	 * THIS IS DISCUSSED IN THE "BACKEND TIPS" RESOURCE.	
	 */
		
	// EXTRACT DATA FROM REQUEST BODY
	const b = req.body;
	const user = {
		displayName: b.displayName || "no name set",
		name: b.name,
		age: b.age,
		password: HASHER(b.password),
		patient: b.patient,
	};

	// Case: If user already exists
	if (await coll.findOne({name: user.name}) != null) 
		return res.status(400)
			.send(`User named '${user.name}' already exists.`);

	// Insert to db
	const insert_res = await coll.insertOne(user);
	user._id = insert_res.insertedId;

	// Send new user object
	return res.status(200)
		.json(user);
}