Trusted Traveler Better Appointment Checker

ttp-appt.js

#!/usr/bin/node

const https = require('https');

const currentAppt = '2020-05-26T09:30'; // Replace with the timestamp of your current appointment
const locationId = 6840; // Replace with the id of the location you want to check

const pushoverApiKey = '<your pushover api key>';
const pushoverUserKey = '<your pushover user key>';

const request = (url, options, data) =>
	new Promise((resolve, reject) => {
		const req = https.request(url, options, function(res) {
			const chunks = [];

			res.on('data', function(chunk) {
				chunks.push(chunk);
			});

			res.on('end', function(chunk) {
				const body = Buffer.concat(chunks);

				try {
					const resp = JSON.parse(body.toString());
					resolve(resp);
				} catch (e) {
					console.error(e);
					reject(e);
				}
			});

			res.on('error', function(error) {
				console.error(error);
				reject(error);
			});
		});

		if (data) req.write(data);

		req.end();
	});

const doTheThing = async () => {
	const resp = await request(
		'https://ttp.cbp.dhs.gov/schedulerapi/slots?orderBy=soonest&limit=1&locationId=${locationId}&minimum=1',
		{
			method: 'GET',
			headers: {
				'Content-Type': 'application/json'
			},
			maxRedirects: 20
		}
	);
	const firstAppt = resp[0].startTimestamp;
	console.log(`Current appointment: ${currentAppt}`);
	console.log(`Next available appointment: ${firstAppt}`);

	if (firstAppt < currentAppt) {
		const pushoverParams = {
			token: pushoverApiKey,
			user: pushoverUserKey,
			title: 'Global Entry Appointment',
			message: `Better Appointment Found: ${firstAppt}`,
			url: 'https://ttp.cbp.dhs.gov/dashboard',
			url_title: 'TTP Login'
		};
		console.warn(`Better appointment found!`);

		await request(
			'https://api.pushover.net/1/messages.json',
			{
				method: 'POST',
				headers: {
					'Content-Type': 'application/json'
				}
			},
			JSON.stringify(pushoverParams)
		);
	} else {
		console.log('Not better :(');
	}
};

doTheThing();

The only ways I know to grab the location id:

• Login to the TTP site and go to the appointment scheduler. Then, with the browser debug tools open, click on the location you want to check. There should be a network request that contains the location id.
• Find your location in the JSON: https://ttp.cbp.dhs.gov/schedulerapi/locations/?inviteOnly=false&operational=true&serviceName=Global%20Entry