How do I Send Email From Retool Table w/ GMail API

Looking for some help to walk through steps of successfully enabling GMail API to send emails from Retool table.

I’ve followed a few threads (including this one [How to connect to Google APIs]) but continue to run into issues in successfully implementing.

From my Google Console, I’ve created credentials w/ OAuth2.0 access, copied key and password into the form in appropriate places when adding a resource to Retool, and added scopes as needed.

When I save the resource, add to a query in Retool, and attempt to re-authenticate API, I’m given an error from Google “ERROR 400: Invalid_Request. Missing required parameter: redirect_uri”

Attempting to troubleshoot, I find no area within my REST_API resource to add a Redirect_API or have found a redirect_URI provided by Retool to input in my GoogleCredentials when creating a ClientKey as I’ve seen available in other tutorials[]

I’m rather new to setting up APIs so I apologize in advance if I’m missing something super simple. Any help would be greatly appreciated in helping me solve.


A simpler solution would be to call a Zapier or Integromat webhook which sends out your Gmail for you

Thanks @byron. I had actually just restarted from scratch after posting and was able to successfully connect and re-authenticate in query editor. However I’m now getting a different error when running the query. I believe it may have something to do with my base_URL and POST methods in the query editor.

Trying to fumble through this one.

Returning error “‘raw’ RFC822 payload message string or uploading message via /upload/* URL required”

Have attached screenshot w/ query and error message, I have not had luck finding answer in stack forums or continuing to read through GMail API documentation. Any help is greatly appreciated.

Hey @hadenp92, I was building out an internal Retool application that used the Gmail API and ran into the same issue. I solved it by adapting Google’s send.js example code.

First, you’ll want to create a Transformer to encode your inputs into a base64-encoded message. Using the inputs your provided in the screenshot, it should look something like this:

const to = {{}}
const subject = 'Your subject'
const body = 'Message body'
const from = ''

const utf8Subject = `=?utf-8?B?${btoa(subject)}?=`;
const messageParts = [
  `From: ${from}`,
  `To: ${to}`,
  'Content-Type: text/html; charset=utf-8',
  'MIME-Version: 1.0',
  `Subject: ${utf8Subject}`,
const message = messageParts.join('\n');

// The body needs to be base64url encoded.
const encodedMessage =  btoa(message)
  .replace(/\+/g, '-')
  .replace(/\//g, '_')
  .replace(/=+$/, '');

return encodedMessage

You’ll then want to update your query. The Body section should have a single raw parameter set to the value of your transformer. I’m assuming that the transformer is named transformer1.

Using this setup, I was able to successfully send an email. I could not figure out how to support the snippet parameter. I also didn’t see the contact_name parameter documented for send

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You are a life saver, thank you so much for the detailed write up and sharing. I just created the transformer and adjusted the raw parameter you suggested and email came through correctly. Now just need to work on the format a bit, assuming I can do this in the transformer at the 'Content-Type: text/html; charset=utf-8 section?

Thanks again for your help! :raised_hands:

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Yep! You can change the content of the email by updating the body string. Pro-tip: You can use template strings for multi-line strings

const body = `This is a multi-line email body.

It almost looks like a template.

No need to make different variables for the content`
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Hey @kyle !

I’m still working through this one but thought maybe I’m overlooking something simple.

My body string I’m trying to include in email is a {{textinput2.value}} string from a component in the tool. Following your example, the body still comes out with each line having been joined. Am I missing something else?? I’m understanding the const message = messageParts.join('\n'); to be needed for encoding to base64url so this join will need to remain correct. Is there a function i should include in the const body : variable??