diff --git a/apps/contacts/apps/web/package.json b/apps/contacts/apps/web/package.json
index 617b8d6ad..578b0bcbe 100644
--- a/apps/contacts/apps/web/package.json
+++ b/apps/contacts/apps/web/package.json
@@ -30,6 +30,7 @@
 		"vite": "^6.0.0"
 	},
 	"dependencies": {
+		"@manacore/shared-api-client": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
diff --git a/apps/contacts/apps/web/src/lib/api/client.ts b/apps/contacts/apps/web/src/lib/api/client.ts
index 750ed1668..64238399d 100644
--- a/apps/contacts/apps/web/src/lib/api/client.ts
+++ b/apps/contacts/apps/web/src/lib/api/client.ts
@@ -1,71 +1,80 @@
 /**
- * Centralized API client with authentication
+ * API Client for Contacts backend
+ * Uses @manacore/shared-api-client for consistent error handling
  */
 
+import { createApiClient, type ApiResult } from '@manacore/shared-api-client';
 import { authStore } from '$lib/stores/auth.svelte';
-import { API_BASE } from './config';
+import { PUBLIC_BACKEND_URL } from '$env/static/public';
+
+const API_URL = PUBLIC_BACKEND_URL || 'http://localhost:3015';
 
 /**
- * Make an authenticated API request
- * @param url API endpoint (will be prefixed with API_BASE)
- * @param options Fetch options
- * @returns Parsed JSON response
+ * Contacts API client instance
+ * - Auto token handling via authStore.getValidToken()
+ * - Consistent ApiResult<T> response format
+ */
+export const api = createApiClient({
+	baseUrl: API_URL,
+	apiPrefix: '/api/v1',
+	getAuthToken: () => authStore.getValidToken(),
+	timeout: 30000,
+	debug: import.meta.env.DEV,
+});
+
+/**
+ * Legacy fetchWithAuth wrapper for backward compatibility
+ * Converts ApiResult to throw-based pattern
  */
 export async function fetchWithAuth<T = unknown>(
 	url: string,
 	options: RequestInit = {}
 ): Promise<T> {
-	const token = await authStore.getAccessToken();
+	const method = options.method || 'GET';
+	const body = options.body ? JSON.parse(options.body as string) : undefined;
 
-	const headers: HeadersInit = {
-		'Content-Type': 'application/json',
-		...(options.headers || {}),
-	};
-
-	if (token) {
-		(headers as Record<string, string>)['Authorization'] = `Bearer ${token}`;
+	let result: ApiResult<T>;
+	switch (method) {
+		case 'POST':
+			result = await api.post<T>(url, body);
+			break;
+		case 'PUT':
+			result = await api.put<T>(url, body);
+			break;
+		case 'PATCH':
+			result = await api.patch<T>(url, body);
+			break;
+		case 'DELETE':
+			result = await api.delete<T>(url);
+			break;
+		default:
+			result = await api.get<T>(url);
 	}
 
-	const response = await fetch(`${API_BASE}${url}`, {
-		...options,
-		headers,
-	});
-
-	if (!response.ok) {
-		const error = await response.json().catch(() => ({ message: 'Request failed' }));
-		throw new Error(error.message || 'Request failed');
+	if (result.error) {
+		throw new Error(result.error.message);
 	}
 
-	return response.json();
+	return result.data as T;
 }
 
 /**
- * Make an authenticated API request without JSON content type
- * Used for file uploads (FormData)
+ * Legacy fetchWithAuthFormData for file uploads
+ * Uses the shared API client's upload method
  */
 export async function fetchWithAuthFormData<T = unknown>(
 	url: string,
 	options: RequestInit = {}
 ): Promise<T> {
-	const token = await authStore.getAccessToken();
+	const formData = options.body as FormData;
+	const result = await api.upload<T>(url, formData);
 
-	const headers: HeadersInit = {
-		...(options.headers || {}),
-	};
-
-	if (token) {
-		(headers as Record<string, string>)['Authorization'] = `Bearer ${token}`;
+	if (result.error) {
+		throw new Error(result.error.message);
 	}
 
-	const response = await fetch(`${API_BASE}${url}`, {
-		...options,
-		headers,
-	});
-
-	if (!response.ok) {
-		const error = await response.json().catch(() => ({ message: 'Request failed' }));
-		throw new Error(error.message || 'Request failed');
-	}
-
-	return response.json();
+	return result.data as T;
 }
+
+// Re-export types for convenience
+export type { ApiResult };
diff --git a/apps/storage/apps/web/package.json b/apps/storage/apps/web/package.json
index 61b9b74f2..789ac2d0c 100644
--- a/apps/storage/apps/web/package.json
+++ b/apps/storage/apps/web/package.json
@@ -27,6 +27,7 @@
 		"vite": "^6.0.0"
 	},
 	"dependencies": {
+		"@manacore/shared-api-client": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
diff --git a/apps/storage/apps/web/src/lib/api/client.ts b/apps/storage/apps/web/src/lib/api/client.ts
index 607c35dda..9ebd5e58c 100644
--- a/apps/storage/apps/web/src/lib/api/client.ts
+++ b/apps/storage/apps/web/src/lib/api/client.ts
@@ -1,48 +1,68 @@
 /**
  * API Client for Storage Backend
+ * Uses @manacore/shared-api-client for consistent error handling
  */
 
+import { createApiClient, type ApiResult } from '@manacore/shared-api-client';
 import { authStore } from '$lib/stores/auth.svelte';
 
-const API_BASE_URL = 'http://localhost:3016/api/v1';
+const API_URL = 'http://localhost:3016';
 
+/**
+ * Storage API client instance
+ * - Auto token handling via authStore.getValidToken()
+ * - Consistent ApiResult<T> response format
+ */
+const api = createApiClient({
+	baseUrl: API_URL,
+	apiPrefix: '/api/v1',
+	getAuthToken: () => authStore.getAccessToken(),
+	timeout: 30000,
+	debug: import.meta.env.DEV,
+});
+
+// Legacy type alias for backward compatibility
 export interface ApiResponse<T> {
 	data?: T;
 	error?: string;
 }
 
-async function getHeaders(): Promise<HeadersInit> {
-	const token = await authStore.getAccessToken();
-	const headers: HeadersInit = {
-		'Content-Type': 'application/json',
-	};
-	if (token) {
-		headers['Authorization'] = `Bearer ${token}`;
+/**
+ * Convert ApiResult to legacy ApiResponse format
+ */
+function toLegacyResponse<T>(result: ApiResult<T>): ApiResponse<T> {
+	if (result.error) {
+		return { error: result.error.message };
 	}
-	return headers;
+	return { data: result.data ?? undefined };
 }
 
+/**
+ * Legacy request wrapper for backward compatibility
+ */
 async function request<T>(endpoint: string, options: RequestInit = {}): Promise<ApiResponse<T>> {
-	try {
-		const headers = await getHeaders();
-		const response = await fetch(`${API_BASE_URL}${endpoint}`, {
-			...options,
-			headers: {
-				...headers,
-				...(options.headers || {}),
-			},
-		});
+	const method = options.method || 'GET';
+	const body = options.body ? JSON.parse(options.body as string) : undefined;
 
-		if (!response.ok) {
-			const errorData = await response.json().catch(() => ({}));
-			return { error: errorData.message || `HTTP ${response.status}` };
-		}
-
-		const data = await response.json();
-		return { data };
-	} catch (error) {
-		return { error: error instanceof Error ? error.message : 'Unknown error' };
+	let result: ApiResult<T>;
+	switch (method) {
+		case 'POST':
+			result = await api.post<T>(endpoint, body);
+			break;
+		case 'PUT':
+			result = await api.put<T>(endpoint, body);
+			break;
+		case 'PATCH':
+			result = await api.patch<T>(endpoint, body);
+			break;
+		case 'DELETE':
+			result = await api.delete<T>(endpoint);
+			break;
+		default:
+			result = await api.get<T>(endpoint);
 	}
+
+	return toLegacyResponse(result);
 }
 
 // File Types
@@ -112,38 +132,20 @@ export const filesApi = {
 	get: (id: string) => request<StorageFile>(`/files/${id}`),
 
 	upload: async (file: File, folderId?: string): Promise<ApiResponse<StorageFile>> => {
-		const token = await authStore.getAccessToken();
 		const formData = new FormData();
 		formData.append('file', file);
 		if (folderId) {
 			formData.append('parentFolderId', folderId);
 		}
 
-		try {
-			const response = await fetch(`${API_BASE_URL}/files/upload`, {
-				method: 'POST',
-				headers: {
-					Authorization: `Bearer ${token}`,
-				},
-				body: formData,
-			});
-
-			if (!response.ok) {
-				const errorData = await response.json().catch(() => ({}));
-				return { error: errorData.message || `HTTP ${response.status}` };
-			}
-
-			const data = await response.json();
-			return { data };
-		} catch (error) {
-			return { error: error instanceof Error ? error.message : 'Unknown error' };
-		}
+		const result = await api.upload<StorageFile>('/files/upload', formData);
+		return toLegacyResponse(result);
 	},
 
 	download: async (id: string): Promise<Blob | null> => {
 		const token = await authStore.getAccessToken();
 		try {
-			const response = await fetch(`${API_BASE_URL}/files/${id}/download`, {
+			const response = await fetch(`${API_URL}/api/v1/files/${id}/download`, {
 				headers: {
 					Authorization: `Bearer ${token}`,
 				},
diff --git a/apps/todo/apps/web/package.json b/apps/todo/apps/web/package.json
index 75d8298cc..ff4b7f56a 100644
--- a/apps/todo/apps/web/package.json
+++ b/apps/todo/apps/web/package.json
@@ -30,6 +30,7 @@
 		"vite": "^6.0.0"
 	},
 	"dependencies": {
+		"@manacore/shared-api-client": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-splitscreen": "workspace:*",
 		"@manacore/shared-types": "workspace:*",
diff --git a/apps/todo/apps/web/src/lib/api/client.ts b/apps/todo/apps/web/src/lib/api/client.ts
index eb4e6ed00..a454d14eb 100644
--- a/apps/todo/apps/web/src/lib/api/client.ts
+++ b/apps/todo/apps/web/src/lib/api/client.ts
@@ -1,106 +1,89 @@
-import { browser } from '$app/environment';
+/**
+ * API Client for Todo backend
+ * Uses @manacore/shared-api-client for consistent error handling
+ */
+
+import { createApiClient, type ApiResult } from '@manacore/shared-api-client';
 import { PUBLIC_BACKEND_URL } from '$env/static/public';
 
-interface ApiOptions {
-	method?: string;
-	body?: unknown;
-	headers?: Record<string, string>;
+const API_URL = PUBLIC_BACKEND_URL || 'http://localhost:3018';
+
+// Token storage for manual token management (legacy pattern)
+let currentToken: string | null = null;
+
+/**
+ * Todo API client instance
+ * - Supports manual token setting via setAccessToken()
+ * - Consistent ApiResult<T> response format
+ * - Runtime URL injection for Docker
+ */
+export const api = createApiClient({
+	baseUrl: API_URL,
+	apiPrefix: '',
+	getAuthToken: async () => currentToken,
+	timeout: 30000,
+	debug: import.meta.env.DEV,
+});
+
+/**
+ * Legacy token management functions
+ * Used by auth store to set token after login
+ */
+export function setAccessToken(token: string | null) {
+	currentToken = token;
 }
 
-interface ApiError {
-	message: string;
-	statusCode: number;
+export function getAccessToken(): string | null {
+	return currentToken;
 }
 
 /**
- * Get the backend URL, preferring runtime-injected value in browser
- * This allows Docker to inject PUBLIC_BACKEND_URL_CLIENT at runtime
- * instead of using the build-time PUBLIC_BACKEND_URL
+ * Wrapper for legacy code that expects throws instead of ApiResult
+ * Converts ApiResult to throw-based pattern for backward compatibility
  */
-function getBackendUrl(): string {
-	if (browser && typeof window !== 'undefined') {
-		const runtimeUrl = (window as Window & { __PUBLIC_BACKEND_URL__?: string })
-			.__PUBLIC_BACKEND_URL__;
-		if (runtimeUrl) {
-			return runtimeUrl;
-		}
+export async function fetchApi<T>(
+	endpoint: string,
+	options: { method?: string; body?: unknown } = {}
+): Promise<T> {
+	const { method = 'GET', body } = options;
+
+	let result: ApiResult<T>;
+	switch (method) {
+		case 'POST':
+			result = await api.post<T>(endpoint, body);
+			break;
+		case 'PUT':
+			result = await api.put<T>(endpoint, body);
+			break;
+		case 'PATCH':
+			result = await api.patch<T>(endpoint, body);
+			break;
+		case 'DELETE':
+			result = await api.delete<T>(endpoint);
+			break;
+		default:
+			result = await api.get<T>(endpoint);
 	}
-	return PUBLIC_BACKEND_URL || 'http://localhost:3018';
+
+	if (result.error) {
+		throw new Error(result.error.message);
+	}
+
+	return result.data as T;
 }
 
-class ApiClient {
-	private accessToken: string | null = null;
+/**
+ * Legacy apiClient wrapper for backward compatibility
+ */
+export const apiClient = {
+	setAccessToken,
+	getAccessToken,
+	get: <T>(endpoint: string) => fetchApi<T>(endpoint, { method: 'GET' }),
+	post: <T>(endpoint: string, body?: unknown) => fetchApi<T>(endpoint, { method: 'POST', body }),
+	put: <T>(endpoint: string, body?: unknown) => fetchApi<T>(endpoint, { method: 'PUT', body }),
+	patch: <T>(endpoint: string, body?: unknown) => fetchApi<T>(endpoint, { method: 'PATCH', body }),
+	delete: <T>(endpoint: string) => fetchApi<T>(endpoint, { method: 'DELETE' }),
+};
 
-	// Use getter to evaluate URL at request time (browser may hydrate after construction)
-	private get baseUrl(): string {
-		return getBackendUrl();
-	}
-
-	setAccessToken(token: string | null) {
-		this.accessToken = token;
-	}
-
-	getAccessToken(): string | null {
-		return this.accessToken;
-	}
-
-	async fetch<T>(endpoint: string, options: ApiOptions = {}): Promise<T> {
-		const { method = 'GET', body, headers = {} } = options;
-
-		const requestHeaders: Record<string, string> = {
-			'Content-Type': 'application/json',
-			...headers,
-		};
-
-		if (this.accessToken) {
-			requestHeaders['Authorization'] = `Bearer ${this.accessToken}`;
-		}
-
-		const response = await fetch(`${this.baseUrl}${endpoint}`, {
-			method,
-			headers: requestHeaders,
-			body: body ? JSON.stringify(body) : undefined,
-		});
-
-		if (!response.ok) {
-			let errorMessage = 'An error occurred';
-			try {
-				const errorData = (await response.json()) as ApiError;
-				errorMessage = errorData.message || errorMessage;
-			} catch {
-				errorMessage = response.statusText || errorMessage;
-			}
-			throw new Error(errorMessage);
-		}
-
-		// Handle 204 No Content
-		if (response.status === 204) {
-			return {} as T;
-		}
-
-		return response.json() as Promise<T>;
-	}
-
-	// Convenience methods
-	get<T>(endpoint: string, headers?: Record<string, string>): Promise<T> {
-		return this.fetch<T>(endpoint, { method: 'GET', headers });
-	}
-
-	post<T>(endpoint: string, body?: unknown, headers?: Record<string, string>): Promise<T> {
-		return this.fetch<T>(endpoint, { method: 'POST', body, headers });
-	}
-
-	put<T>(endpoint: string, body?: unknown, headers?: Record<string, string>): Promise<T> {
-		return this.fetch<T>(endpoint, { method: 'PUT', body, headers });
-	}
-
-	patch<T>(endpoint: string, body?: unknown, headers?: Record<string, string>): Promise<T> {
-		return this.fetch<T>(endpoint, { method: 'PATCH', body, headers });
-	}
-
-	delete<T>(endpoint: string, headers?: Record<string, string>): Promise<T> {
-		return this.fetch<T>(endpoint, { method: 'DELETE', headers });
-	}
-}
-
-export const apiClient = new ApiClient();
+// Re-export types for convenience
+export type { ApiResult };
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1538cbfe8..971e84d25 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1085,6 +1085,9 @@ importers:
 
   apps/contacts/apps/web:
     dependencies:
+      '@manacore/shared-api-client':
+        specifier: workspace:*
+        version: link:../../../../packages/shared-api-client
       '@manacore/shared-auth':
         specifier: workspace:*
         version: link:../../../../packages/shared-auth
@@ -3866,6 +3869,9 @@ importers:
 
   apps/storage/apps/web:
     dependencies:
+      '@manacore/shared-api-client':
+        specifier: workspace:*
+        version: link:../../../../packages/shared-api-client
       '@manacore/shared-auth':
         specifier: workspace:*
         version: link:../../../../packages/shared-auth
@@ -4094,6 +4100,9 @@ importers:
 
   apps/todo/apps/web:
     dependencies:
+      '@manacore/shared-api-client':
+        specifier: workspace:*
+        version: link:../../../../packages/shared-api-client
       '@manacore/shared-auth':
         specifier: workspace:*
         version: link:../../../../packages/shared-auth