An easy google sheet for landing page

google_sheet.js

var SHEET_NAME = "Sheet1";

function doGet(e) {
    return handleResponse(e);
}

function doPost(e) {
    return handleResponse(e);
}

function handleResponse(e) {
    var lock = LockService.getPublicLock();
    lock.waitLock(30 * 1000);
    try {
        var doc = SpreadsheetApp.getActive();
        var sheet = doc.getSheetByName(SHEET_NAME);

        var name = e.parameter.name;
        var email = e.parameter.email;

        if (!name) throw new Error('no name');
        if (!email) throw new Error('no email');

        sheet.appendRow([new Date(), name, email]);

        return ContentService
            .createTextOutput(JSON.stringify({"result": "success"}))
            .setMimeType(ContentService.MimeType.JSON);
    } catch (e) {

        return ContentService
            .createTextOutput(JSON.stringify({"result": "error", "error": e}))
            .setMimeType(ContentService.MimeType.JSON);
    } finally {
        lock.releaseLock();
    }
}