fmpcloud.io locate in which 30 min time frame the high of the day occurred.

findDailyHigh30MinTimeFrame.js

#!/usr/bin/env node
const fetch = require("node-fetch");

// Main

(async () => {
  const apiKey = "<your_api_key>";
  const symbol = "TSLA";
  const from = "2021-06-15";
  const to = "2021-06-19";

  const highlow = await inWhich30MinDidHighOccur(apiKey, symbol, from, to);
  console.log(highlow);
})();

// Helper funcs

/**
 * Returns the high point of the day with daily statistics. This allows you to see at which time
 * the high normally occurs. In 30 min increments. If the high was at 9:45, we would return the 
 * timespan starting at 9:30.
 * 
 * @param {string} apiKey fmpcloud.io API key
 * @param {string} symbol Ticker symbol
 * @param {string} from Date. HAS to be in YYYY-MM-DD format. ex: 1990-01-29. Should be less than `to` param.
 * @param {string} to Date. HAS to be in YYYY-MM-DD format. ex: 1990-01-29. Should be greater than `from` param.
 */
async function inWhich30MinDidHighOccur(apiKey, symbol, from, to) {
  const dailyHL = await getDailyHighLow(apiKey, symbol, from, to);
  const resp = await fetch(`https://fmpcloud.io/api/v3/historical-chart/30min/${symbol.toUpperCase()}?from=${from}&to=${to}&apikey=${apiKey}`);
  const intradayArr = await resp.json();
  const final = [];
  dailyHL.forEach(daily => {
    // Filter to find all intraday stats by date
    const intraday = intradayArr.filter(i => String(i.date).startsWith(String(daily.date)));
    // Find the hour that had the daily high for that day
    const found = intraday.find(i => i.high >= daily.high);
    if (found !== undefined) final.push({ daily, timespan: found });
  });
  return final;
}

/**
 *
 * @param {string} apiKey fmpcloud.io API key
 * @param {string} symbol Ticker symbol
 * @param {string} from Date. HAS to be in YYYY-MM-DD format. ex: 1990-01-29. Should be less than `to` param.
 * @param {string} to Date. HAS to be in YYYY-MM-DD format. ex: 1990-01-29. Should be greater than `from` param.
 * @param {number} hourOfDay 0-24 by hour, in military time (13 is 1pm, etc..).
 */
async function getPriceFromTimeOfDay(apiKey, symbol, from, to, hourOfDay = 0) {
  if (hourOfDay < 0 || hourOfDay > 24) {
    throw new Error("[getPriceFromTimeOfDay] : Error : Invalid timeOfDay! Must be 0-24");
  }
  const url = `https://fmpcloud.io/api/v3/historical-chart/1hour/${symbol.toUpperCase()}?from=${from}&to=${to}&apikey=${apiKey}`;
  const resp = await fetch(url);
  const json = await resp.json();
  // If we are given 5, turn it into 05
  const hrs = hourOfDay.length === 1 ? "0" + hourOfDay : hourOfDay;
  return json.filter(s => String(s.date).endsWith(`${hrs}:00:00`));
}

/**
 *
 * @param {string} apiKey fmpcloud.io API key
 * @param {string} symbol Ticker symbol
 * @param {string} from Date. HAS to be in YYYY-MM-DD format. ex: 1990-01-29. Should be less than `to` param.
 * @param {string} to Date. HAS to be in YYYY-MM-DD format. ex: 1990-01-29. Should be greater than `from` param.
 */
async function getDailyHighLow(apiKey, symbol, from, to) {
  try {
    const url = `https://fmpcloud.io/api/v3/historical-price-full/${symbol}?from=${from}&to=${to}&apikey=${apiKey}`;
    const resp = await fetch(url);
    const json = await resp.json();
    return json.historical;
  } catch (err) {
    console.error(err);
    throw new Error(err);
  }
}