How to GET data in Flask from AJAX post

I used the best answer but i found a bad request error. I solve this error as below:

1- remove this line from ajax request:

contentType: 'application/json;charset=UTF-8',

2- Access to data by request.form instead of request.json.

The Javascript part will similar to this:

$(document).ready(function(){
var clicked;
$(".favorite").click(function(){
clicked = $(this).attr("name");
$.ajax({
  type : 'POST',
  url : "{{url_for('test')}}",
  data : {'data':clicked}
});
 });
});

Flask part:

@app.route('/test/', methods=['GET','POST'])
def test():
      clicked=None
      if request.method == "POST":
          clicked=request.form['data']
     return render_template('test.html')

You can compose your payload in your ajax request as so:

$(document).ready(function(){
var clicked;
$(".favorite").click(function(){
clicked = $(this).attr("name");
$.ajax({
  type : 'POST',
  url : "{{url_for('test')}}",
  contentType: 'application/json;charset=UTF-8',
  data : {'data':clicked}
});
 });
});

In your flask endpoint, you can extract the value as follows:

@app.route('/test/', methods=['GET','POST'])
def test():
     clicked=None
     if request.method == "POST":
          clicked=request.json['data']
     return render_template('test.html')