Monitor a API Endpoint to check JSON and sent data to Slack

monitor.js

"use strict";

const API_URL = "https://api.example.com/your-endpoint"; // Your API request
const SLACK_URL = "";                                    // Check: https://api.slack.com/incoming-webhooks
const NOTIFICATION = {text: "ITEM I WANT CHANGED!"};     // Message sent to Slack
const INTERVAL = 60000;                                  // Interval in miliseconds

const interval = setInterval(() => {
    fetch(API_URL)
        .then(response => {
            return response.json();
        })
        .then(data => {
            /**
             * Check your JSON data here
             * Example:
             */
            for (var i = 0; i < data.length; i++) {
                if (data[i].title !== 'ITEM I WANT TO CHECK') continue;
                if (data[i].property === 'not this') continue;

                /**
                 * Finally send data to Slack
                 */
                const request = {
                    method: "POST",
                    body: JSON.stringify(NOTIFICATION)
                };
                
                fetch(SLACK_URL, request)
                    .then(res => {
                        alert(NOTIFICATION);     // Redundancy is good.
                        clearInterval(interval); // Finish after sent data.
                    });
            }
        })
}, INTERVAL);