get base64 raw data of image from responseBody using jquery ajax

sample.js

$.ajax({
  type: "GET",
  url: "imageURL",
  beforeSend: function (xhr) {
    xhr.overrideMimeType('text/plain; charset=x-user-defined');
  },
  success: function (result, textStatus, jqXHR) {       
    if(result.length < 1){
        alert("The thumbnail doesn't exist");
        $("#thumbnail").attr("src", "data:image/png;base64,");
        return
    }

    var binary = "";
    var responseText = jqXHR.responseText;
    var responseTextLen = responseText.length;

    for ( i = 0; i < responseTextLen; i++ ) {
        binary += String.fromCharCode(responseText.charCodeAt(i) & 255)
    }
    $("#thumbnail").attr("src", "data:image/png;base64,"+btoa(binary));
  },
  error: function(xhr, textStatus, errorThrown){
    alert("Error in getting document "+textStatus);
  } 
});

Saved my day, thanks :D

thank you so so so much..After hours of struggle....

My champion! 👯