A Quick Demo

You can see the results here

Step 1: create a Google form

Create a form in Google Drive like always. It's best to avoid multi-choice questions, because when you send the data, it will just be a string anyway. In your actual form on your website, you can create a dropdown like I did above.

Google Drive Form Editor
Google's form editor

Step 2: figure out the names of each value

Each entry you add to the form has a name, it will be something like entry.123456789. The easiest way to get these names is to preview your form (click the preview icon at the top of the page), fill it out, and submit it. Look in the network tab for the request that got sent to Google and there you will find the names you need

The submitted form data as shown in the network tab

Don't worry about fvv, draftResponse, pageHistory, or fbzx. The only names you need are the ones in the form entry.*.

Take note of the form's URL as well

After you have submitted the form while previewing it, take a note of the URL. In the case of my demo form, it is https://docs.google.com/forms/u/0/d/e/1FAIpQLSegO8Qy4C6KrXa8x3wd7tW05xvDq6Qrv4_PNJOld_vIE3ipXA/formResponse This is where to send the data from your website (more on this below).

Step 3: build your form in your website

How you do this depends on how you build your websites. Here is the code I wrote for the above demo form in React

import React, { useState } from 'react';
// this is the URL noted just above
const POST_URL = 'https://docs.google.com/forms/u...'
const ENTRY_NAME = 'entry.249370976';
function DemoForm() {
    const [formData, setFormData] = useState({
        [ENTRY_NAME]: 'Atom',
    });
    const [hasSubmitted, setHasSubmitted] = useState(false);
    async function handleSubmit(e: React.FormEvent) {
        e.stopPropagation();
        e.preventDefault();
        const encodedValues = Object.keys(formData).map((key) => {
            const encKey = encodeURIComponent(key);
            const encValue = encodeURIComponent(formData[key]);
            return `${encKey}=${encValue}`;
        });
        const body = encodedValues.join('&').replace(/%20/g, '+');
        try {
            await fetch(POST_URL, {
                method: 'POST',
                mode: 'no-cors',
                headers: {
                    'Content-Type':
                        'application/x-www-form-urlencoded',
                },
                body
            });
        } finally {
            setHasSubmitted(true);
        }
    }
    let content;
    if (hasSubmitted) {
        content = (
            <>
                <p>Thanks, I like {formData[ENTRY_NAME]} too!</p>
                <a
                    onClick={() => setHasSubmitted(false)}
                >
                    show form again
                </a>
            </>
        );
    } else {
        content = (
            <form
                method="post"
                onSubmit={handleSubmit}
                action={POST_URL}
            >
                <label htmlFor="texteditor">
                  your favorite editor
                </label>
                <select
                    id="texteditor"
                    name={ENTRY_NAME}
                    onChange={(e) => {
                        const val = e.target.value;
                        setFormData((f) => {
                            return {
                                ...f,
                                [ENTRY_NAME]: val
                            };
                        });
                    }}
                    value={formData[ENTRY_NAME]}
                >
                    <option value="Atom">Atom</option>
                    <option value="Emacs">Emacs</option>
                    <option value="Sublime">Sublime</option>
                    <option value="Textmate">Textmate</option>
                    <option value="vim">vim</option>
                    <option value="VSCode">VSCode</option>
                </select>
                <input type="submit" value="submit" />
            </form>
        );
    }
    return (
        <div>{content}</div>
    );
}
export { DemoForm };
Google only accepts urlencoded form data, you can't send JSON. Alternatively you can send the values as query params on the URL, ie .../formResponse?entry.111=foo&entry.222=bar

The above is set up so the form can be submitted whether the visitor has JavaScript enabled or not: the data is sent via fetch(), otherwise when JS is disabled it falls back to the standard form operations, due to the <form> having action and method set.

If a user does not have JavaScript enabled, once they submit the form, they will end up at Google's response page and no longer on your website

Google Form response page

Depending on your site's audience none of this may matter. But if you don't want them to ever see this screen, a quick fix is to hide the form from JS disablers with <noscript>.

Limitations

A big downside to this approach is there is no way to know if the form submission succeeds or not. If you look above where I call fetch(), I have mode: 'no-cors' set. This is because Google has not enabled CORS for their forms endpoint. This means you can submit the data and Google will receive it, but you can't know anything about the request (ie whether it succeeded), it's an opaque box from your perspective. If you don't turn on mode: 'no-cors', then there will be an error shown in the dev console. This error is just informing you CORS is not enabled, even if you see the error the form data still gets sent. Basically turning on no-cors suppresses that error.

I only use this approach for casual stuff

I only use Google Drive in this way for side projects. If the form submission fails for whatever reason, I just don't get that info and I'm ok with that for less important stuff. If this data is important, you should find a more robust approach.

I like this because I hate spending money on side projects. With free approaches like this, I don't have to worry as much about keeping all my websites out there up and running.