Upload Files to HTML Form with Google Apps Script

The Google Script will automatically download a file from the Internet and upload it to another HTML form with an HTTP POST request. If the file already exists in your Google Drive, you can use the DriveApp.getFileById() method to retrieve the file and send it to the web form. Also see: Receive Files in Google Drive

function downloadFile() {
  // Download a file now (GET), so we can upload it in the HTTP POST below.
  var response = UrlFetchApp.fetch('https://www.google.com/humans.txt');
  var fileBlob = response.getBlob();

  var payload = {
    fieldOne: 'value for field one',
    fieldTwo: 'value for field two',
    fileAttachment: fileBlob,
  };

  // Because payload is a JavaScript object, it will be interpreted as
  // an HTML form. (We do not need to specify contentType; it will
  // automatically default to either 'application/x-www-form-urlencoded'
  // or 'multipart/form-data')

  var options = {
    method: 'post',
    payload: payload,
  };

  UrlFetchApp.fetch('http://example.com/upload_form.cgi', options);
}

Amit Agarwal is a web geek, solo entrepreneur and loves making things on the Internet. Google recently awarded him the Google Developer Expert and Google Cloud Champion title for his work on Google Workspace and Google Apps Script.

Awards & Recognition

Google Developer Expert

Google Developer Expert

Google awarded us the Developer Expert title recogizing our work in Workspace

ProductHunt Golden Kitty

ProductHunt Golden Kitty

Our Gmail tool won the Lifehack of the Year award at ProductHunt Golden Kitty Awards

Microsoft MVP Alumni

Microsoft MVP Alumni

Microsoft awarded us the Most Valuable Professional title for 5 years in a row

Google Cloud Champion

Google Cloud Champion

Google awarded us the Champion Innovator award for technical expertise

Want to stay up to date?
Sign up for our email newsletter.

We will never send any spam emails. Promise 🫶🏻