diff --git a/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts b/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts
index 00832f931..a8a75b6b1 100644
--- a/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts
+++ b/ccm-core-apiclient/src/main/typescript/clients/categorization-api.ts
@@ -2,6 +2,8 @@ import {
     ApiResponse,
     LibreCcmApiClient,
     ListView,
+    ApiError,
+    ApiClientError,
 } from "@libreccm/ccm-apiclient-commons";
 
 import {
@@ -26,59 +28,93 @@ export class CategorizationApiClient {
         domain: string,
         path: string
     ): Promise<Category> {
+        const url = `${this.#CATEGORIES_API_PREFIX}/${domain}/${path}`;
         try {
-            const response: ApiResponse = await this.#apiClient.get(
-                `${this.#CATEGORIES_API_PREFIX}/${domain}/${path}`
-            );
+            const response: ApiResponse = await this.#apiClient.get(url);
 
             if (response.ok) {
                 return buildCategoryFromRecord(
                     (await response.json()) as Record<string, unknown>
                 );
             } else {
-                throw `Failed to get category ${path} of domain ${domain}:
-                ${response.status} ${response.statusText}`;
+                throw new ApiError(
+                    response.status,
+                    response.statusText,
+                    "get",
+                    `Failed to get category ${path} of domain ${domain}`,
+                    url
+                );
             }
         } catch (err) {
-            throw `Failed to get category ${path} of domain ${domain}: ${err}`;
+            if (err instanceof ApiError) {
+                throw err;
+            } else {
+                throw new ApiClientError(
+                    `Failed to get category ${path} of domain ${domain}: ${err}`
+                );
+            }
         }
     }
 
     async getCategoryById(categoryId: number): Promise<Category> {
+        const url = `${
+            this.#CATEGORIES_API_PREFIX
+        }/categories/ID-${categoryId}`;
         try {
-            const response: ApiResponse = await this.#apiClient.get(
-                `${this.#CATEGORIES_API_PREFIX}/categories/ID-${categoryId}`
-            );
+            const response: ApiResponse = await this.#apiClient.get(url);
 
             if (response.ok) {
                 return buildCategoryFromRecord(
                     (await response.json()) as Record<string, unknown>
                 );
             } else {
-                throw `Failed to get category with ID ${categoryId}:
-                ${response.status} ${response.statusText}`;
+                throw new ApiError(
+                    response.status,
+                    response.statusText,
+                    "get",
+                    `Failed to get category with ID ${categoryId}`,
+                    url
+                );
             }
         } catch (err) {
-            throw `Failed to get category with Id ${categoryId}: ${err}`;
+            if (err instanceof ApiError) {
+                throw err;
+            } else {
+                throw new ApiClientError(
+                    `Failed to get category with Id ${categoryId}: ${err}`
+                );
+            }
         }
     }
 
     async getCategoryByUuid(uuid: string): Promise<Category> {
         try {
-            const response: ApiResponse = await this.#apiClient.get(
-                `${this.#CATEGORIES_API_PREFIX}/categories/UUID-${uuid}`
-            );
+            const url = `${
+                this.#CATEGORIES_API_PREFIX
+            }/categories/UUID-${uuid}`;
+            const response: ApiResponse = await this.#apiClient.get(url);
 
             if (response.ok) {
                 return buildCategoryFromRecord(
                     (await response.json()) as Record<string, unknown>
                 );
             } else {
-                throw `Failed to get category with UUID ${uuid}:
-                ${response.status} ${response.statusText}`;
+                throw new ApiError(
+                    response.status,
+                    response.statusText,
+                    "get",
+                    `Failed to get category with UUID ${uuid}`,
+                    url
+                );
             }
         } catch (err) {
-            throw `Failed to get category with UUID ${uuid}: ${err}`;
+            if (err instanceof ApiError) {
+                throw err;
+            } else {
+                throw new ApiClientError(
+                    `Failed to get category with UUID ${uuid}: ${err}`
+                );
+            }
         }
     }
 
@@ -495,12 +531,10 @@ export class CategorizationApiClient {
     ): Promise<ListView<Categorization>> {
         try {
             const response: ApiResponse = await this.#apiClient.get(
-                `${
-                    this.#CATEGORIES_API_PREFIX
-                }/UUID-${uuid}/@objects`,
+                `${this.#CATEGORIES_API_PREFIX}/UUID-${uuid}/@objects`,
                 {
                     limit: limit.toString(),
-                    offset: offset.toString()
+                    offset: offset.toString(),
                 }
             );