Ajax call results in 500 {internal server error} - ajax

Question

I am trying to send json data through ajax call.
Following is the code I used. I'm using node.js as the backend. a_filters,b_filters,etc. are arrays. I googled the error but couldn't get the code to work.
var filters =
{
"a" : a_filters,
"b" : b_filters,
"c" : c_filters,
"d" : d_filters
};
$.ajax({
url : "query/get-filtered-data",
dataType : 'json',
async: "true",
data:JSON.stringify(filters),
contentType: 'application/json; charset=utf-8',
success : function(data){
},
failure: function(data){
alert('got an error');
}
});
EDIT : This is my server-side code.
var express = require('express');
var router = express.Router();
//the URL below is correct since it redirects from 'query/'
router.get('/get-filtered-data', function (req, res, next) {
console.log(req);
var filters = JSON.parse(req.body);
console.log("foo");
var a_filters = filters["a"];
var b_filters = filters["b"];
var c_filters = filters["c"];
var d_filters = filters["d"];
res.send(query);
});
conosle.log('foo') doesn't print anything.
console.log(req) has req.body empty.
Thanks a lot in advance.

Answer 1

Because you are referencing req.body, you need to use a router method that includes a body - post or put.
You may also need to include type: "POST" in your jQuery Ajax method.
There is a more general semantic question about whether you should use get with a query string to communicate parameters when retrieving data rather than using a request body, but that is an API design question rather than a cause of errors.