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Python Flask ajax POST 400 BAD REQUEST

I am trying to send data from a form to Python Flask using ajax. I do not want the page to reload. When I try to send the form I get the error
POST http://127.0.0.1:5000/addTran 400 (BAD REQUEST)
I just want to input a Russian word with an English translation and then to write it to a file from flask.
Here is my html and JavaScript
<form id="translationForm">
<label for="russianWord">Russian Word:</label><br>
<input type="text" id="russianWord" serialize-as="russianWord" name="russianWord"><br>
<label for="englishWord">English word:</label><br>
<input type="text" id="englishWord" serialize-as="englishWord" name="englishWord">
<input type="submit" value="Submit">
</form>
<script>
$(function () {
$('#translationForm').on('submit',function (e) {
$.ajax({
type: 'POST',
url: "{{url_for('addTran')}}",
data: $('#translationForm').serialize(),
contentType: "application/j-son;charset=UTF-8",
dataType: "json",
success: function () {
alert("It worked!");
}
});
e.preventDefault();
});
});
Here is my Python route
#app.route('/addTran',methods=["POST"])
def addTran():
if request.method == "POST":
tran = request.get_json(force=True)
with open('/home/matt/Desktop/info.txt','w') as w:
w.write(str(tran))

Adding JSON.stringify() worked!
data: JSON.stringify($('#translationForm').serialize())

Maybe it's the typo in the request content type?
contentType: "application/j-son;charset=UTF-8",
To
contentType: "application/json",

can not send file with Axios to django, It's always empty

I'm using axios and django 3.1.6, the problem is that all axios can not send files via post request and in my views request.FILES is always empty. (while sending it as default html form post, it's not empty)
I'm doing it like this
my script.js file
...
$("#myform").submit(function(event) {
event.preventDefault();
});
$("button[type='submit']").click(function() {
let form = $("#myform").serialize()
axios.post(".", form).then((response) => {
if (response.data.status == "success") {
myform.reset();
// other codes here
}
}).catch((error) => {
console.error(error);
})
});
template.html
...
<form method="post", action="." enctype="multipart/form-data" id="myform">
{% csrf_token %}
<!-- inputs .. file inputs -->
</form>
view.py
if request.POST.get("add-medical-record"):
print(request.POST) # i have my data here
print(request.FILES) # it's always empty
...
thanks you guys.

I got it the problem was in script.js file. just send it as new FormData(myform) and that's all. it works.
finally my script.js file
...
$("#myform").submit(function(event) {
event.preventDefault();
});
$("button[type='submit']").click(function() {
let form = new FormData($("#myform")[0])
axios.post(".", form).then((response) => {
if (response.data.status == "success") {
myform.reset();
// other codes here
}
}).catch((error) => {
console.error(error);
})
});

Send HTML checkbox values to flask without using form

Suppose, I have a simple HTML checkbox.
When the HTML page is loaded through flask initially, this checkbox displays boolean values from a postgres database. It cannot be included in an HTML form, nor I can use submit button.
Now, if I tick/untick this checkbox, I want to send the value associated with this checkbox to flask and ultimately to db.
Can I do it with ninja or do I need ajax call for it?? I tried with ajax, but :(
I am a newbie to ajax,json,flask.
I tried searching other questions, but most of them I found were with HTML form or with php.
Sorry for my lack of knowledge, if I miss something.
<input type="checkbox" id="statustick" name="statustick" value="{{ testvariable }}" {% if testvariable==True %}checked{% endif %}>
<script>
$("#statustick").change( function(){
if( $(this).is(':checked') ) {
$.ajax({
type: "POST",
url: "{{ url_for('logging') }}",
contentType: "application/json",
data: JSON.stringify("#check".val()),
dataType: "json",
success: function(response) {
console.log(response);
},
error: function(err) {
console.log(err);
}
});
}else{
alert("unchecked");
}
});

Passing data with ajax to django with post method

I'm try to send data to a django view through ajax with POST method as I saw in one tutorial.
The code I've made is the following (myURL is the URL where I call testview):
$(document).on('submit','#form',function(e){
e.preventDefault();
$.ajax({
type:'POST',
url:'/myURL/',
data:{
HELLO: "I'm inside ajax data"
},
contentType: "application/json",
datatype: 'json',
sucess:function(){
alert("Ajax pass data correctly");
}
})
});
</script>
And in django I'd call HELLO as following. test.html is where I have the html form
if request.method == 'POST':
takeHELLOfromajaxpost = request.POST['HELLO']
return render(request,'test.html',{'dataTakenfromAjax':takeHELLOfromajaxpost})
return render(request,'test.html',{})
Then I would template tagging in the same HTML {{ dataTakenfromAjax }} to verify if I'm taking that data , but nothing happens! I even get no error.

First of all, you are not sending csrfmiddlewaretoken with your request.
Second, you have typo in success argument.
Third, you probably expecting it to completely change html? Than you should add $("body").html() at successful response. That way your variable appear on page.
test.html:
{{ dataTakenfromAjax }}
<form action="" id="form">
{% csrf_token %}
<button type="submit">Submit</button>
</form>
<script
src="https://code.jquery.com/jquery-3.4.1.js"
integrity="sha256-WpOohJOqMqqyKL9FccASB9O0KwACQJpFTUBLTYOVvVU="
crossorigin="anonymous"></script>
<script>
$(document).on('submit', '#form', function (e) {
e.preventDefault();
$.ajax({
type: 'POST',
url: '/myURL/',
data: {
csrfmiddlewaretoken: $("[name=csrfmiddlewaretoken]").val(),
HELLO: "I'm inside ajax data"
},
success: function (data) {
$("body").html(data);
}
})
});
</script>

How can I catch server json response while uploading image using Ajax?

I have a form which is loaded via jQuery from the external template file:
$('#imguploadform').html(' ').load('{% url upload_form %}');
In template it looks like this:
<img src="{{ MEDIA_URL }}img/misc/upload.png" alt="Illustration" title="myimage" />
<form id="uploadForm" enctype="multipart/form-data" method="post" action="upload_picture/">
{{ form.as_ul }}
<input type="submit" value="Upload" id="uploadImage" />
</form>
I'm trying to upload an image with ajax using jquery form plugin:
var submit_options = {
target: '#picworks',
dataType: 'json',
success: function() {
alert('It Works!');
}
};
$('#uploadForm').submit(function(){
$(this).ajaxSubmit(submit_options);
return false;
});
But then I want to return a json object from server and dynamically load into page an image using it's returned address. I've tried like this:
def upload_picture(request):
dest = save_original(request.FILES['image'])
form = UploadImageForm(request.POST, request.FILES)
res = json.dumps({
"path": dest,
})
return HttpResponse(res, mimetype='application/json')
The problem is that I can't catch a json response in javascript, so my browser shows me just an empty page with json dictionary content. What I'm doing wrong?

Have your success callback take a parameter. That will be the response.

var submit_options = {
target: '#picworks',
dataType: 'json',
success: function(response) {
alert('It Works!');
window.location.href = response.path;
}
};

I solved the problem! The thing is that function which replace form submitting action with an ajax request is called earlier than the form loads from external file. So it should be like this:
$('#imguploadform').html(' ').load('{% url upload_form %}',
function(){
var submit_options = {
dataType: 'json',
success: update_dom
};
function update_dom(data) {
$('#picworks').html('<img src="' + data.path + '" alt="Illustration" />');
}
$('#uploadForm').submit(function(){
$(this).ajaxSubmit(submit_options);
return false;
});
});