Create a Field for Universal List lists.field.add

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"IBLOCK_TYPE_ID":"lists","IBLOCK_ID":"123","FIELDS":{"NAME":"Project","IS_REQUIRED":"Y","MULTIPLE":"N","TYPE":"L","SORT":"10","CODE":"PROJECT","LIST":{"10":{"VALUE":"Planning","SORT":10,"DEF":"Y"},"20":{"VALUE":"In Development","SORT":20,"DEF":"N"}},"LIST_TEXT_VALUES":"Testing\nCompleted\nDeferred","SETTINGS":{"SHOW_ADD_FORM":"Y","SHOW_EDIT_FORM":"Y","ADD_READ_ONLY_FIELD":"N","EDIT_READ_ONLY_FIELD":"N","SHOW_FIELD_PREVIEW":"N"}},"auth":"**put_access_token_here**"}' \
        https://**put_your_bitrix24_address**/rest/lists.field.add
        

// This snippet is an ES module: top-level await requires type="module" or a bundler.
        // $b24 is an already-initialized SDK instance (see the SDK "Get started" guide).
        import { Text } from '@bitrix24/b24jssdk'
        import type { B24Frame } from '@bitrix24/b24jssdk'
        
        declare const $b24: B24Frame
        
        try {
          const response = await $b24.actions.v2.call.make<string>({
            method: 'lists.field.add',
            params: {
              IBLOCK_TYPE_ID: 'lists',
              IBLOCK_ID: '123',
              FIELDS: {
                NAME: 'Project',
                IS_REQUIRED: 'Y',
                MULTIPLE: 'N',
                TYPE: 'L',
                SORT: '10',
                CODE: 'PROJECT',
                LIST: {
                  '10': { VALUE: 'Planning', SORT: 10, DEF: 'Y' },
                  '20': { VALUE: 'In progress', SORT: 20, DEF: 'N' },
                },
                LIST_TEXT_VALUES: 'Testing\nCompleted\nPostponed',
                SETTINGS: {
                  SHOW_ADD_FORM: 'Y',
                  SHOW_EDIT_FORM: 'Y',
                  ADD_READ_ONLY_FIELD: 'N',
                  EDIT_READ_ONLY_FIELD: 'N',
                  SHOW_FIELD_PREVIEW: 'N',
                },
              },
            },
            requestId: Text.getUuidRfc4122()
          })
        
          // The payload is available only on a successful response
          if (!response.isSuccess) {
            console.error(response.getErrorMessages().join('; '))
          } else {
            const result = response.getData()!.result
            console.info('Created field ID:', result)
          }
        } catch (error) {
          // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
          console.error(error)
        }
        

<!-- Load the SDK (UMD build); it is exposed as the global B24Js -->
        <script src="https://unpkg.com/@bitrix24/b24jssdk@1/dist/umd/index.min.js"></script>
        <script>
          async function addListField() {
            try {
              // Initialize the SDK inside a Bitrix24 frame
              const $b24 = await B24Js.initializeB24Frame()
        
              const response = await $b24.actions.v2.call.make({
                method: 'lists.field.add',
                params: {
                  IBLOCK_TYPE_ID: 'lists',
                  IBLOCK_ID: '123',
                  FIELDS: {
                    NAME: 'Project',
                    IS_REQUIRED: 'Y',
                    MULTIPLE: 'N',
                    TYPE: 'L',
                    SORT: '10',
                    CODE: 'PROJECT',
                    LIST: {
                      '10': { VALUE: 'Planning', SORT: 10, DEF: 'Y' },
                      '20': { VALUE: 'In progress', SORT: 20, DEF: 'N' },
                    },
                    LIST_TEXT_VALUES: 'Testing\nCompleted\nPostponed',
                    SETTINGS: {
                      SHOW_ADD_FORM: 'Y',
                      SHOW_EDIT_FORM: 'Y',
                      ADD_READ_ONLY_FIELD: 'N',
                      EDIT_READ_ONLY_FIELD: 'N',
                      SHOW_FIELD_PREVIEW: 'N',
                    },
                  },
                },
                requestId: B24Js.Text.getUuidRfc4122()
              })
        
              // The payload is available only on a successful response
              if (!response.isSuccess) {
                console.error(response.getErrorMessages().join('; '))
                return
              }
        
              const result = response.getData().result
              console.info('Created field ID:', result)
            } catch (error) {
              // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
              console.error(error)
            }
          }
        
          document.addEventListener('DOMContentLoaded', addListField)
        </script>
        

from b24pysdk.errors import BitrixAPIError, BitrixSDKException
        
        fields = {
            "NAME": "Project",
            "IS_REQUIRED": "Y",
            "MULTIPLE": "N",
            "TYPE": "L",
            "SORT": "10",
            "CODE": "PROJECT",
            "LIST": {
                "10": {
                    "VALUE": "Planning",
                    "SORT": 10,
                    "DEF": "Y",
                },
                "20": {
                    "VALUE": "In development",
                    "SORT": 20,
                    "DEF": "N",
                },
            },
            "LIST_TEXT_VALUES": "Testing\nCompleted\nPostponed",
            "SETTINGS": {
                "SHOW_ADD_FORM": "Y",
                "SHOW_EDIT_FORM": "Y",
                "ADD_READ_ONLY_FIELD": "N",
                "EDIT_READ_ONLY_FIELD": "N",
                "SHOW_FIELD_PREVIEW": "N",
            },
        }
        
        try:
            bitrix_response = client.lists.field.add(
                iblock_type_id="lists",
                iblock_id=123,
                fields=fields,
            ).response
            result = bitrix_response.result
            print(result)
        except BitrixAPIError as error:
            print(
                "Bitrix API error",
                f"error: {error.error}",
                f"error_description: {error.error_description}",
                sep="\n",
            )
        except BitrixSDKException as error:
            print(f"Bitrix SDK error: {error.message}")
        except Exception as error:
            print(f"Unexpected error: {error}")
        

try {
            $response = $b24Service
                ->core
                ->call(
                    'lists.field.add',
                    [
                        'IBLOCK_TYPE_ID' => 'lists',
                        'IBLOCK_ID' => '123',
                        'FIELDS' => [
                            'NAME' => 'Project',
                            'IS_REQUIRED' => 'Y',
                            'MULTIPLE' => 'N',
                            'TYPE' => 'L',
                            'SORT' => '10',
                            'CODE' => 'PROJECT',
                            'LIST' => [
                                '10' => ['VALUE' => 'Planning', 'SORT' => 10, 'DEF' => 'Y'],
                                '20' => ['VALUE' => 'In Development', 'SORT' => 20, 'DEF' => 'N']
                            ],
                            'LIST_TEXT_VALUES' => 'Testing\nCompleted\nDeferred',
                            'SETTINGS' => [
                                'SHOW_ADD_FORM' => 'Y',
                                'SHOW_EDIT_FORM' => 'Y',
                                'ADD_READ_ONLY_FIELD' => 'N',
                                'EDIT_READ_ONLY_FIELD' => 'N',
                                'SHOW_FIELD_PREVIEW' => 'N'
                            ]
                        ]
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            echo 'Success: ' . print_r($result, true);
            processData($result);
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error adding field: ' . $e->getMessage();
        }
        

BX24.callMethod(
            'lists.field.add',
            {
                'IBLOCK_TYPE_ID': 'lists',
                'IBLOCK_ID': '123',
                'FIELDS': {
                    'NAME': 'Project',
                    'IS_REQUIRED': 'Y',
                    'MULTIPLE': 'N',
                    'TYPE': 'L',
                    'SORT': '10',
                    'CODE': 'PROJECT',
                    'LIST': {
                        '10': { 'VALUE': 'Planning', 'SORT': 10, 'DEF': 'Y' },
                        '20': { 'VALUE': 'In Development', 'SORT': 20, 'DEF': 'N' }
                    },
                    'LIST_TEXT_VALUES': 'Testing\nCompleted\nDeferred',
                    'SETTINGS': {
                        'SHOW_ADD_FORM': 'Y',
                        'SHOW_EDIT_FORM': 'Y',
                        'ADD_READ_ONLY_FIELD': 'N',
                        'EDIT_READ_ONLY_FIELD': 'N',
                        'SHOW_FIELD_PREVIEW': 'N'
                    }
                }
            },
            function(result) {
                if (result.error()) {
                    console.error(result.error());
                } else {
                    console.log(result.data());
                    // The final list will contain 5 options:
                    // 1. Planning (default), 2. In Development,
                    // 3. Testing, 4. Completed, 5. Deferred
                }
            }
        );
        

require_once('crest.php');
        
        $result = CRest::call(
            'lists.field.add',
            [
                'IBLOCK_TYPE_ID' => 'lists',
                'IBLOCK_ID' => '123',
                'FIELDS' => [
                    'NAME' => 'Project',
                    'IS_REQUIRED' => 'Y',
                    'MULTIPLE' => 'N',
                    'TYPE' => 'L',
                    'SORT' => '10',
                    'CODE' => 'PROJECT',
                    'LIST' => [
                        '10' => ['VALUE' => 'Planning', 'SORT' => 10, 'DEF' => 'Y'],
                        '20' => ['VALUE' => 'In Development', 'SORT' => 20, 'DEF' => 'N']
                    ],
                    'LIST_TEXT_VALUES' => 'Testing\nCompleted\nDeferred',
                    'SETTINGS' => [
                        'SHOW_ADD_FORM' => 'Y',
                        'SHOW_EDIT_FORM' => 'Y',
                        'ADD_READ_ONLY_FIELD' => 'N',
                        'EDIT_READ_ONLY_FIELD' => 'N',
                        'SHOW_FIELD_PREVIEW' => 'N'
                    ]
                ]
            ]
        );
        
        echo '<PRE>';
        print_r($result);
        echo '</PRE>';
        

// client and ctx are already created — see the Go SDK section
        res, err := client.Core().Call(ctx, "lists.field.add", b24.Params{
        	"IBLOCK_TYPE_ID": "lists",
        	"IBLOCK_ID":      "123",
        	"FIELDS": b24.Params{
        		"NAME":        "Project",
        		"IS_REQUIRED": "Y",
        		"MULTIPLE":    "N",
        		"TYPE":        "L",
        		"SORT":        "10",
        		"CODE":        "PROJECT",
        		"LIST": b24.Params{
        			"10": b24.Params{
        				"VALUE": "Planning",
        				"SORT":  10,
        				"DEF":   "Y",
        			},
        			"20": b24.Params{
        				"VALUE": "In Development",
        				"SORT":  20,
        				"DEF":   "N",
        			},
        		},
        		"LIST_TEXT_VALUES": "Testing\nCompleted\nDeferred",
        		"SETTINGS": b24.Params{
        			"SHOW_ADD_FORM":        "Y",
        			"SHOW_EDIT_FORM":       "Y",
        			"ADD_READ_ONLY_FIELD":  "N",
        			"EDIT_READ_ONLY_FIELD": "N",
        			"SHOW_FIELD_PREVIEW":   "N",
        		},
        	},
        })
        if err != nil {
        	return fmt.Errorf("lists.field.add: %w", err)
        }
        
        var value string
        if err := json.Unmarshal(res.Result, &value); err != nil {
        	return fmt.Errorf("parse response: %w", err)
        }
        fmt.Println("result:", value)