With reference to this answer of Google, I tried to use the json version of my feeds by using the URL: https://[blog address].blogspot.com/feeds/posts/default?alt=json. My blog is set to public mode, but then also it is throwing CORS policy. And this is the code I used:
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script>
var getJSON = function(url, callback) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.responseType = 'json';
xhr.onload = function() {
var status = xhr.status;
if (status === 200) {
callback(null, xhr.response);
} else {
callback(status, xhr.response);
}
};
xhr.send();
};
getJSON('https://[blog].blogspot.com/feeds/posts/default?alt=json',
function(err, data) {
if (err !== null) {
alert('Something went wrong: ' + err);
} else {
alert('Your query count: ' + data.query.count);
}
});
</script>
Try alt=json-in-script instead:
<script type="text/javascript">
function myFunction({feed}) {
alert('Your query count: ' + feed.entry.length);
}
</script>
<script type="text/javascript" src="https://blog.blogspot.com/feeds/posts/default?alt=json-in-script&callback=myFunction"></script>