fetch POST, cors error | Chinese Rule of Eight

So we have an image loader input file type. We also have a button control.
The onclick event for the button calls our js function uploadImage.

Once

<button name="submit" id="btnSubmit" onclick="uploadImage()">upload image</button>

function uploadImage() {

console.log("upload image");

var image = document.getElementById("imgUploader").files[0];

console.dir(image);

var formData = new FormData();

formData.append('imgUploader', image);

fetch('http://localhost:8080/api/Upload', {

method:'POST',

body: formData,

mode: 'no-cors'

}).then(function(data) {

console.log("------result from image upload--------");

console.log(data);

});

}

</script>

app.post("/api/Upload", function(req, res) {

console.log("POST request on api/Upload, you are trying to upload an image");

res.send("testing 1 2 3");

});