JSFiddle - React, Tailwind, and code Playground

HTML

<div id='output'></div>
<script src="https://kripken.github.io/sql.js/js/sql.js"></script>
<script src="https://dl.dropboxusercontent.com/u/5257657/jszip.js"></script>

JavaScript

// This variable will receive instance of SQLite
var db = null;

var jsZip = new JSZip();

// method taken from your demo
function print(text) {
  var element = document.getElementById('output');
  element.innerHTML += "<br/>" + text;//.replace(/\n/g, '<br>');
}

// method taken from your demo
// only one modification : returns true when everything ok, and false when an exception has been triggered
function execute(commands) {
  try {
    print( "<b>" + commands + "</b>" );
    var data = db.exec(commands.replace(/\n/g, '; '));
    print(JSON.stringify(data, null, '  '));
    return true;
  } catch(e) {
    print(e);
    return false;
  }
}


var xmlhttp = new XMLHttpRequest();

xmlhttp.responseType = "arraybuffer";


var requestUrl = "http://testing.indoo.rs/indoors/rest/buildings/108095766/mapfile?api_key=3ae55d0b-757b-4b81-980d-045502bd02cd";


xmlhttp.onreadystatechange = function () {
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
        print("Content loaded");
        var response = xmlhttp.response;

        var zipContent = jsZip.load(response);

        var indoorDbFile = zipContent.files['indoors.db'];


        var indoorDbUnpacked = indoorDbFile._data.getContent();
        db = new SQL.Database(indoorDbUnpacked);
        print("Database initialized");
        
        print("Inserting fourth row into db");
        db.run("INSERT INTO networklocation (x, y, network_id, floor_id) VALUES (?, ?, ?, ?);", [123, 123, 1, 1]);
        
        print("db 'networklocation' table:");
        var stmt = db.prepare("SELECT * FROM networklocation;");
        while (stmt.step()) { //
        var row = JSON.stringify(stmt.getAsObject());
        print(row);
        }
        print("");
        
        
        print("Exporting db");
        var data = db.export();
        db.close();
        db = null;
        
        print("Re-initializing db");
        db = new SQL.Database(data);
        
        print("db 'networklocation' table:");
        stmt...