slack-invite.js

/** Automate Slack invitations
 *  See https://github.com/ErikKalkoken/slackApiDoc/blob/master/users.admin.invite.md
 */
const inviteToSlack =
	(token, email) => new Promise((resolve, reject) => {
		const data = querystring.stringify({
			resend: true,
			token,
			email,
		});

		const request = https.request({
			method: 'POST',
			host: '<your-workspace>.slack.com',
			path: '/api/users.admin.invite',
			port: 443,
			headers: {
				'Content-Type': 'application/x-www-form-urlencoded',
				'Content-Length': Buffer.byteLength(data)
			},
		},
		response => {
			if (response.statusCode < 200 || response.statusCode > 299) {
				reject(response.statusCode);
			}
			const body = [];

			response.setEncoding('utf8');
			response.on('data', (chunk) => body.push(chunk));
			response.on('end', () => resolve(
				JSON.parse(body.join(''))
			));
		});

		request.on('error', (err) => reject(err));
		request.write(data);
		request.end();
	});