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In mongodb it's easy to make at upsert, meaning update-or-insert by calling

db.collection.update({criteria}, {updated fields}, true)

The third parameter means - insert a new document if the document doesn't exist yet. So, for example, the following will insert a new document for the user if there's no document for that user yet, and will update it if it already exists:

 db.users.update({user_id: '1234'}, {user_id: '1234', name: 'Ran'}, true)

	{
	"name": "cra-json-server",
	"version": "0.1.0",
	"private": true,
	"dependencies": {
	"react": "^15.6.1",
	"react-dom": "^15.6.1"
	},
	"devDependencies": {
	"json-server": "^0.11.2",

	var fetch = require('node-fetch')

	async function getDataFromAPI() {
	let response = await fetch("https://api.github.com/users/up1")
	let data = await response.json()
	console.log(JSON.stringify(data, null, "\t"))
	}

	getDataFromAPI()

	var fetch = require('node-fetch')

	async function getDataFromAPI() {
	let response = await fetch("https://api.github.com/users/up1")
	let data = await response.json()
	console.log(JSON.stringify(data, null, "\t"))
	}

	getDataFromAPI()

	/**
	* Generates number of random geolocation points given a center and a radius.
	* @param {Object} center A JS object with lat and lng attributes.
	* @param {number} radius Radius in meters.
	* @param {number} count Number of points to generate.
	* @return {array} Array of Objects with lat and lng attributes.
	*/
	function generateRandomPoints(center, radius, count) {
	var points = [];
	for (var i=0; i<count; i++) {

	'use strict'

	const MongoClient = require('mongodb')

	class Database {

	constructor (uri) {
	this.uri = uri
	this.db = {}
	return this

	export default function handle(req, res) {
	res.end('Hello World');
	}

	import React from "react";
	import { makeStyles } from "@material-ui/core/styles";
	import clsx from "clsx";
	import Card from "@material-ui/core/Card";
	import CardHeader from "@material-ui/core/CardHeader";
	import CardMedia from "@material-ui/core/CardMedia";
	import CardContent from "@material-ui/core/CardContent";
	import CardActions from "@material-ui/core/CardActions";
	import Collapse from "@material-ui/core/Collapse";
	import Avatar from "@material-ui/core/Avatar";