scraper.js

var request = require('request');
var async = require('async');
var sqlite3 = require('sqlite3').verbose();

function requestFunction(){
    request('http://www.landkreis-heilbronn.de/zulassung/kfz.json', function (error, response, html) {
        if (!error && response.statusCode == 200) {

            async.series([function (callback) {
                data = JSON.parse(html);
                callback();
            }], function (err) {
                statement.run(data[0].visitors, data[0].wait, data[0].nextcall, data[0].lastupdate);
            });
        }
    });
}

var db = new sqlite3.Database('data.sqlite');
db.exec("CREATE TABLE IF NOT EXISTS KFZ(visitors INT, wait INT, nextcall INT, lastupdate DATE PRIMARY KEY)");
var data;
var statement = db.prepare("INSERT OR IGNORE INTO KFZ VALUES (?, ?, ?, ?)");

var run = setInterval(requestFunction, 60000);