Goole App Script code that can be put into the Google Forms trigger to send data to Salesforce using Web-To-Lead

FormSubmitToSalesforceWebToLead.gs

const SALESFORCE_ORG_ID = '00DQy00000TqD0T';  // Salesforce Instance Org Id, can be taken from generated Web-To-Lead link.

function onFormSubmit(e) {
  const reponseFields = e.response.getItemResponses();

  const payload = {
    'oid': SALESFORCE_ORG_ID, 
    'first_name': reponseFields[0].getResponse(),
    'last_name': reponseFields[1].getResponse(),
    'company': reponseFields[2].getResponse(),
    'email': reponseFields[3].getResponse()
  };

  const formData = [];
  for (const key in payload) {
    formData.push(encodeURIComponent(key) + "=" + encodeURIComponent(payload[key]));
  }

  const options = {
    'method': 'post',
    'headers': { 'Content-Type': 'application/x-www-form-urlencoded' },
    'payload': formData.join("&")
  };

  const response = UrlFetchApp.fetch(`https://webto.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8&orgId=${SALESFORCE_ORG_ID}`, options);

  Logger.log("Response code: " + response.getResponseCode());
  Logger.log("Response body: " + response.getContentText());
}