jQuery posting JSON
You post JSON like this
$.ajax(url, { data : JSON.stringify(myJSObject), contentType : 'application/json', type : 'POST', ...if you pass an object as settings.data jQuery will convert it to query parameters and by default send with the data type application/x-www-form-urlencoded; charset=UTF-8, probably not what you want
'data' should be a stringified JavaScript object:
data: JSON.stringify({ "userName": userName, "password" : password })To send your formData, pass it to stringify:
data: JSON.stringify(formData)Some servers also require the application/json content type:
contentType: 'application/json'There's also a more detailed answer to a similar question here: Jquery Ajax Posting json to webservice
In case you are sending this post request to a cross domain, you should check out this link.
https://stackoverflow.com/a/1320708/969984
Your server is not accepting the cross site post request. So the server configuration needs to be changed to allow cross site requests.