using RestSharp;


var options = new RestClientOptions("http://localhost:56350/api/v1/List/{udListDefinitionName}/Items");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"Id\": 123,\n  \"Name\": \"<string>\",\n  \"Tooltip\": \"<string>\",\n  \"Deleted\": true,\n  \"UdListDefinitionId\": 123,\n  \"Rank\": 123,\n  \"TableRight\": {\n    \"Mask\": \"<string>\",\n    \"Reason\": \"<string>\"\n  },\n  \"FieldProperties\": {}\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    Id: 123,
    Name: '<string>',
    Tooltip: '<string>',
    Deleted: true,
    UdListDefinitionId: 123,
    Rank: 123,
    TableRight: {Mask: '<string>', Reason: '<string>'},
    FieldProperties: {}
  })
};

fetch('http://localhost:56350/api/v1/List/{udListDefinitionName}/Items', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "56350",
  CURLOPT_URL => "http://localhost:56350/api/v1/List/{udListDefinitionName}/Items",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'Id' => 123,
    'Name' => '<string>',
    'Tooltip' => '<string>',
    'Deleted' => true,
    'UdListDefinitionId' => 123,
    'Rank' => 123,
    'TableRight' => [
        'Mask' => '<string>',
        'Reason' => '<string>'
    ],
    'FieldProperties' => [
        
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

import requests

url = "http://localhost:56350/api/v1/List/{udListDefinitionName}/Items"

payload = {
    "Id": 123,
    "Name": "<string>",
    "Tooltip": "<string>",
    "Deleted": True,
    "UdListDefinitionId": 123,
    "Rank": 123,
    "TableRight": {
        "Mask": "<string>",
        "Reason": "<string>"
    },
    "FieldProperties": {}
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    Id: 123,
    Name: '<string>',
    Tooltip: '<string>',
    Deleted: true,
    UdListDefinitionId: 123,
    Rank: 123,
    TableRight: {Mask: '<string>', Reason: '<string>'},
    FieldProperties: {}
  })
};

fetch('http://localhost:56350/api/v1/List/{udListDefinitionName}/Items', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "Id": 123,
  "Name": "<string>",
  "Tooltip": "<string>",
  "Deleted": true,
  "UdListDefinitionId": 123,
  "Rank": 123,
  "TableRight": {
    "Mask": "<string>",
    "Reason": "<string>"
  },
  "FieldProperties": {}
}