Yahoo Finance AppsScript for Google Sheets

Code.gs

function yahooF(ticker) {
  const url = `https://query1.finance.yahoo.com/v8/finance/chart/${ticker}`;
  
  const res = UrlFetchApp.fetch(url, {muteHttpExceptions: true});  
  const contentText = res.getContentText();
  const data = JSON.parse(contentText);
 
  // Check if the result exists and has data
  if (data && data.chart && data.chart.result && data.chart.result.length > 0) {
    const regularMarketPrice = data.chart.result[0].meta.regularMarketPrice;
    console.log(regularMarketPrice);
    return regularMarketPrice;
  } else {
    console.log("Error: Unable to retrieve market price.");
    return null;
  }
}

Proposed updated version for dynamic attribute request.

function yahooF(ticker, attribute = "regularMarketPrice") {

  if (!ticker || typeof ticker !== 'string') {
    console.log("Error: Ticker is required and must be a string.");
    return null;
  }
  
  if (!attribute || typeof attribute !== 'string') {
    console.log("Error: Attribute is required and must be a string.");
    return null;
  }
  
  const url = `https://query1.finance.yahoo.com/v8/finance/chart/${ticker}`;
  
  try {
    const res = UrlFetchApp.fetch(url, {muteHttpExceptions: true});
    const contentText = res.getContentText();
    const data = JSON.parse(contentText);
    
    if (!data || !data.chart || !data.chart.result || data.chart.result.length === 0) {
      console.log(`Error: Unable to retrieve data for ticker ${ticker}.`);
      return null;
    }
    
    const meta = data.chart.result[0].meta;
    
    if (meta.hasOwnProperty(attribute)) {
      const value = meta[attribute];
      console.log(`${attribute} for ${ticker}: ${value}`);
      return value;
    } else {
      console.log(`Error: Attribute '${attribute}' not found for ticker ${ticker}.`);
      console.log(`Available attributes: ${Object.keys(meta).join(', ')}`);
      return null;
    }
    
  } catch (error) {
    console.log(`Error fetching data for ${ticker}: ${error.message}`);
    return null;
  }
}

As of today, following attributes are available:

currency
symbol
exchangeName
fullExchangeName
instrumentType
firstTradeDate
regularMarketTime
hasPrePostMarketData
gmtoffset
timezone
exchangeTimezoneName
regularMarketPrice
fiftyTwoWeekHigh
fiftyTwoWeekLow
regularMarketDayHigh
regularMarketDayLow
regularMarketVolume
longName
shortName
chartPreviousClose
previousClose
scale
priceHint
currentTradingPeriod
tradingPeriods
dataGranularity
range
validRanges