diff --git a/projects/typescript-xmlrpc/src/lib/deserializer.spec.ts b/projects/typescript-xmlrpc/src/lib/deserializer.spec.ts
index d54e1544..3611e056 100644
--- a/projects/typescript-xmlrpc/src/lib/deserializer.spec.ts
+++ b/projects/typescript-xmlrpc/src/lib/deserializer.spec.ts
@@ -1,6 +1,7 @@
 import { TestBed } from '@angular/core/testing';
 import { deserialize } from './deserializer';
 import { applicationError } from './constants';
+import { MethodFault, MethodResponse } from './xmlrpc-types';
 
 describe('Deserializer', () => {
   beforeEach(() => {
@@ -11,28 +12,32 @@ describe('Deserializer', () => {
     // eslint-disable-next-line max-len
     const goodInput = `<?xml version="1.0"?><methodResponse><params><param><value><string>South Dakota</string></value></param></params></methodResponse>`;
     const result = deserialize(goodInput);
-    expect(result).toEqual({ value: 'South Dakota' });
+    const expected: MethodResponse = { value: 'South Dakota' };
+    expect(result).toEqual(expected);
   });
 
   it('method response with int', () => {
     // eslint-disable-next-line max-len
     const goodInput = `<?xml version="1.0"?><methodResponse><params><param><value><i4>10</i4></value></param></params></methodResponse>`;
     const result = deserialize(goodInput);
-    expect(result).toEqual({ value: 10 });
+    const expected: MethodResponse = { value: 10 };
+    expect(result).toEqual(expected);
   });
 
   it('method response with true bool', () => {
     // eslint-disable-next-line max-len
     const goodInput = `<?xml version="1.0"?><methodResponse><params><param><value><boolean>1</boolean></value></param></params></methodResponse>`;
     const result = deserialize(goodInput);
-    expect(result).toEqual({ value: true });
+    const expected: MethodResponse = { value: true };
+    expect(result).toEqual(expected);
   });
 
   it('method response with false bool', () => {
     // eslint-disable-next-line max-len
     const goodInput = `<?xml version="1.0"?><methodResponse><params><param><value><boolean>0</boolean></value></param></params></methodResponse>`;
     const result = deserialize(goodInput);
-    expect(result).toEqual({ value: false });
+    const expected: MethodResponse = { value: false };
+    expect(result).toEqual(expected);
   });
 
   it('method response with invalid bool', () => {
@@ -46,10 +51,11 @@ describe('Deserializer', () => {
     // eslint-disable-next-line max-len
     const goodInput = `<?xml version="1.0"?><methodResponse><fault><value><struct><member><name>faultCode</name><value><int>4</int></value></member><member><name>faultString</name><value><string>Too many parameters.</string></value></member></struct></value></fault></methodResponse>`;
     const result = deserialize(goodInput);
-    expect(result).toEqual({
+    const expected: MethodFault = {
       faultCode: 4,
       faultString: 'Too many parameters.',
-    });
+    };
+    expect(result).toEqual(expected);
   });
 
   it('process garbage like server errors', () => {
diff --git a/projects/typescript-xmlrpc/src/lib/serializer.spec.ts b/projects/typescript-xmlrpc/src/lib/serializer.spec.ts
index 5a7d3f8a..edb84e0a 100644
--- a/projects/typescript-xmlrpc/src/lib/serializer.spec.ts
+++ b/projects/typescript-xmlrpc/src/lib/serializer.spec.ts
@@ -1,5 +1,6 @@
 import { TestBed } from '@angular/core/testing';
 import { serializeMethodCall } from './serializer';
+import { XmlRpcTypes } from './xmlrpc-types';
 
 describe('serializeMethodCall', () => {
   beforeEach(() => {
@@ -52,6 +53,14 @@ describe('serializeMethodCall', () => {
   });
 
   it('function with array parameter', () => {
+    // eslint-disable-next-line max-len
+    const expectedResult = `<?xml version="1.0"?><methodCall><methodName>function_name</methodName><params><param><value><array><data><value><string>elem1</string></value><value><string>elem2</string></value></data></array></value></param></params></methodCall>`;
+    expect(serializeMethodCall('function_name', [['elem1', 'elem2']])).toBe(
+      expectedResult,
+    );
+  });
+
+  it('function with xmlrpc array parameter', () => {
     // eslint-disable-next-line max-len
     const expectedResult = `<?xml version="1.0"?><methodCall><methodName>function_name</methodName><params><param><value><array><data><value><string>elem1</string></value><value><string>elem2</string></value></data></array></value></param></params></methodCall>`;
     expect(
@@ -71,6 +80,19 @@ describe('serializeMethodCall', () => {
     );
   });
 
+  it('function with map parameter', () => {
+    // eslint-disable-next-line max-len
+    const expectedResult = `<?xml version="1.0"?><methodCall><methodName>function_name</methodName><params><param><value><struct><member><name>data1</name><value><int>0</int></value></member><member><name>data2</name><value><string></string></value></member></struct></value></param></params></methodCall>`;
+    expect(
+      serializeMethodCall('function_name', [
+        new Map<string, XmlRpcTypes>([
+          ['data1', 0],
+          ['data2', ''],
+        ]),
+      ]),
+    ).toBe(expectedResult);
+  });
+
   it('function with struct parameter', () => {
     // eslint-disable-next-line max-len
     const expectedResult = `<?xml version="1.0"?><methodCall><methodName>function_name</methodName><params><param><value><struct><member><name>data1</name><value><int>0</int></value></member><member><name>data2</name><value><string></string></value></member></struct></value></param></params></methodCall>`;
diff --git a/projects/typescript-xmlrpc/src/lib/serializer.ts b/projects/typescript-xmlrpc/src/lib/serializer.ts
index c82ad1c5..579fbb4a 100644
--- a/projects/typescript-xmlrpc/src/lib/serializer.ts
+++ b/projects/typescript-xmlrpc/src/lib/serializer.ts
@@ -1,6 +1,7 @@
 import { create } from 'xmlbuilder2';
 import { DateFormatter } from './date_formatter';
 import { XMLBuilder } from 'xmlbuilder2/lib/interfaces';
+import { Utils } from './utils';
 import { XmlRpcArray, XmlRpcStruct, XmlRpcTypes } from './xmlrpc-types';
 
 /**
@@ -59,14 +60,29 @@ function serializeValue(value: XmlRpcTypes, xml: XMLBuilder): void {
         appendBuffer(value as ArrayBuffer, xml);
         break;
       } else {
-        if ('data' in value) {
+        if (Utils.instanceOfXmlRpcArray(value)) {
           appendArray(
             value as XmlRpcArray,
             xml.ele('value').ele('array').ele('data'),
           );
           break;
         }
-        if ('members' in value) {
+        if (Array.isArray(value)) {
+          appendArray(
+            { data: value },
+            xml.ele('value').ele('array').ele('data'),
+          );
+          break;
+        }
+        if (value instanceof Map) {
+          const xmlrpcstruct = { members: [] };
+          for (let [key, val] of value) {
+            xmlrpcstruct.members.push({ name: key, value: val });
+          }
+          appendStruct(xmlrpcstruct, xml.ele('value').ele('struct'));
+          break;
+        }
+        if (Utils.instanceOfXmlRpcStruct(value)) {
           appendStruct(value as XmlRpcStruct, xml.ele('value').ele('struct'));
           break;
         }
diff --git a/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.spec.ts b/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.spec.ts
index e702dd89..8ba5cd70 100644
--- a/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.spec.ts
+++ b/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.spec.ts
@@ -5,6 +5,7 @@ import {
   HttpClientTestingModule,
   HttpTestingController,
 } from '@angular/common/http/testing';
+import { MethodResponse } from './xmlrpc-types';
 
 describe('AngularXmlrpcService', () => {
   let service: AngularXmlrpcService;
@@ -39,8 +40,9 @@ describe('AngularXmlrpcService', () => {
     const testData = `<?xml version="1.0"?><methodResponse><params><param><value><string>3.2.1</string></value></param></params></methodResponse>`;
     service.configureService(new URL('http://localhost/cobbler_api'));
     const callObservable = service.methodCall('version');
+    const expected: MethodResponse = { value: '3.2.1' };
     callObservable.subscribe((value) => {
-      expect(value).toEqual({ value: '3.2.1' });
+      expect(value).toEqual(expected);
       done();
     });
     const req = httpTestingController.expectOne('http://localhost/cobbler_api');
@@ -84,7 +86,7 @@ describe('AngularXmlrpcService static methods', () => {
       ).toBe(parameter.resultResponse);
     });
 
-    it('instanceOfMethodFaullt', () => {
+    it('instanceOfMethodFault', () => {
       expect(AngularXmlrpcService.instanceOfMethodFault(parameter.data)).toBe(
         parameter.resultFault,
       );
diff --git a/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.ts b/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.ts
index fe33bfad..77cb15eb 100644
--- a/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.ts
+++ b/projects/typescript-xmlrpc/src/lib/typescript-xmlrpc.service.ts
@@ -2,6 +2,7 @@ import { Injectable } from '@angular/core';
 
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { serializeMethodCall } from './serializer';
+import { Utils } from './utils';
 import {
   MethodFault,
   MethodResponse,
@@ -25,29 +26,19 @@ export class AngularXmlrpcService {
   private headers: object;
 
   static instanceOfMethodResponse(object: object): object is MethodResponse {
-    return 'value' in object;
+    return Utils.instanceOfMethodResponse(object);
   }
 
   static instanceOfMethodFault(object: object): object is MethodFault {
-    return 'faultCode' in object && 'faultString' in object;
+    return Utils.instanceOfMethodFault(object);
   }
 
   static instanceOfXmlRpcStruct(object: XmlRpcTypes): object is XmlRpcStruct {
-    return (
-      object !== null &&
-      typeof object === 'object' &&
-      Object.keys(object).length === 1 &&
-      'members' in object
-    );
+    return Utils.instanceOfXmlRpcStruct(object);
   }
 
   static instanceOfXmlRpcArray(object: XmlRpcTypes): object is XmlRpcArray {
-    return (
-      object !== null &&
-      typeof object === 'object' &&
-      Object.keys(object).length === 1 &&
-      'data' in object
-    );
+    return Utils.instanceOfXmlRpcArray(object);
   }
 
   constructor(http: HttpClient) {
diff --git a/projects/typescript-xmlrpc/src/lib/utils.ts b/projects/typescript-xmlrpc/src/lib/utils.ts
new file mode 100644
index 00000000..977472a1
--- /dev/null
+++ b/projects/typescript-xmlrpc/src/lib/utils.ts
@@ -0,0 +1,35 @@
+import {
+  MethodFault,
+  MethodResponse,
+  XmlRpcArray,
+  XmlRpcStruct,
+  XmlRpcTypes,
+} from './xmlrpc-types';
+
+export class Utils {
+  static instanceOfMethodResponse(object: object): object is MethodResponse {
+    return 'value' in object;
+  }
+
+  static instanceOfMethodFault(object: object): object is MethodFault {
+    return 'faultCode' in object && 'faultString' in object;
+  }
+
+  static instanceOfXmlRpcStruct(object: XmlRpcTypes): object is XmlRpcStruct {
+    return (
+      object !== null &&
+      typeof object === 'object' &&
+      Object.keys(object).length === 1 &&
+      'members' in object
+    );
+  }
+
+  static instanceOfXmlRpcArray(object: XmlRpcTypes): object is XmlRpcArray {
+    return (
+      object !== null &&
+      typeof object === 'object' &&
+      Object.keys(object).length === 1 &&
+      'data' in object
+    );
+  }
+}
diff --git a/projects/typescript-xmlrpc/src/lib/xmlrpc-types.ts b/projects/typescript-xmlrpc/src/lib/xmlrpc-types.ts
index d5c0285b..c9f7201d 100644
--- a/projects/typescript-xmlrpc/src/lib/xmlrpc-types.ts
+++ b/projects/typescript-xmlrpc/src/lib/xmlrpc-types.ts
@@ -5,8 +5,13 @@ export type XmlRpcTypes =
   | Date
   | ArrayBuffer
   | XmlRpcStruct
-  | XmlRpcArray;
-export type MethodResponse = Param;
+  | Map<string, XmlRpcTypes>
+  | XmlRpcArray
+  | Array<XmlRpcTypes>;
+
+export interface MethodResponse {
+  value: XmlRpcTypes;
+}
 
 export interface MethodFault {
   faultCode: number;