JSONObject jsonObj = new JSONObject();jsonObj.put("username", username);jsonObj.put("apikey", apikey);// Create the POST object and add the parametersHttpPost httpPost = new HttpPost(url);StringEntity entity = new StringEntity(jsonObj.toString(), HTTP.UTF_8);entity.setContentType("application/json");httpPost.setEntity(entity);HttpClient client = new DefaultHttpClient();HttpResponse response = client.execute(httpPost);

curl -l -H "Content-type: application/json" -X POST -d '{"phone":"13521389587","password":"test"}' http://domain/apis/users.json

$.ajax({ url:url, type:"POST", data:data, contentType:"application/json; charset=utf-8", dataType:"json", success: function(){  ... }})

$data = array("name" => "Hagrid", "age" => "36");                                   $data_string = json_encode($data);    $ch = curl_init('http://api.local/rest/users');    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");              curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_HTTPHEADER, array(            'Content-Type: application/json',   'Content-Length: ' . strlen($data_string))      );                                                           $result = curl_exec($ch);