How to slowdown making requests?

I have problem with too fast requesting. When my script makes too many requests per second Google throws an error net::ERR_INSUFFICIENT_RESOURCES

I want to make one request per 20ms.
How I can achieve that?

This is how my main function look at this moment…

const symbolsArr = reader.result.split("\n").map((str) => str.trim()); //symbolsArr is just rergular array, except it's source is from .txt file
    function loopFunction(error_symbol) {
      for (const symbol of symbolsArr) {
        setTimeout(getData(symbol), 5000); //I tried to use setTimeout but it not helps
      return console.log(error_symbol);

And my fetcher…

error_symbols = [];

function getData(symbol) {
    `` +
      `${symbol}?api_token= (don't look at my secret token :))`,
      method: "get",
    .then((res) => {
      if (res.ok) {
        return res.json();
      } else {
        throw new Error(`Symbol ${symbol} is 'empty'`);
    .then((data) => {
      var myJSON = JSON.stringify(data);
      saveFile(myJSON, `${symbol}-json.txt`, "text/plain");
    .catch((error) => {
      throw error + symbol;

Pretty simple, I have to somehow put cooldown on fetcher

94 thoughts on “How to slowdown making requests?”

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