A JS version of the rest1.py

rest1.js

import diagnostics_channel from 'node:diagnostics_channel';
import querystring from 'node:querystring';

const SEARCH_ENDPOINT = `https://${process.env.SPLUNK_HOST}:8089/services/search/jobs`;
const data = {
	search: "inputcsv pharmacy-calls.csv",
	output_mode: "json"
};
const options = {
	method: "POST",
	mode: "cors",
	cache: "no-cache",
	credentials: "same-origin",
	headers: {
		Authorization: `Bearer ${process.env.SPLUNK_TOKEN}`,
		Accept: "application/json"
	},
	redirect: "follow",
	referrerPolicy: "no-referrer",
	body: querystring.encode(data),
};

diagnostics_channel.subscribe('http', (message, name) => {
	console.log('name:', name);
	console.log('message:', message);
})
let response = await fetch(SEARCH_ENDPOINT, options);
console.log(response.status);
console.log(response.body);
console.log(await response.json());

See the Python3 version of this script for details.