Object property name changes when parsing it to node js - ajax

Question

I have an object:
{"description":"Κλείσε τις βάνες","closeValves":["13/21","12/31","13/12","12/32"]}
and when i am sending it to node js with ajax the moment it gets into the router.post it transforms into this
{"description":"Κλείσε τις βάνες","closeValves[]":["13/21","12/31","13/12","12/32"]} ..
Any ideas why this is happening? in the node script where i have the router.post i am requiring this
let express = require('express');
let router = express.Router();
Update at comment:
the call the function:
formEvent(json,'events/entry',valvescallback);
and the function AJAX:
function formEvent(data,module,next,e){//the request function
e=e||false;
console.log("form:",data)
if( e ){e.preventDefault();}
var url = './'+module; // the script where you handle the form input.
$.ajax({
type: "POST",
url: url,
data: data,
dataType:'json',
success: function (data) {
next(data);
},
error:function (data) {
next(data)
}
});
}
Update at comment 2:
No the data come from postgress SQL in a text type column like this
{"description":"Κλείσε τις βάνες","closeValves":["13/21","12/31","13/12","12/32"]}
and i am using this to transform it into json and parse it:
var json = jQuery.parseJSON(data.task);
json.action = 'getValves';
json.test = json.closeValves;//test to see if it also changes name
I can see that it transformes any property that is an array like this
name:[1,2,3] --> name[]:[1,2,3]
the odd is that when I am console.log the data inside the AJAX function the are in the right form but inside the post they change..

Answer 1

I found it!! the answer is at the definition of the body-parser npm usage:
app.use(bodyParser.urlencoded({ extended: false}));
you just need to make the extended property true and the array name will not change.. so the answer is
app.use(bodyParser.urlencoded({ extended: true}));