Initial microservice-importer setup with NestJS backend and Next.js frontend

frontend/lib/api.ts

@@ -0,0 +1,27 @@
+const API_BASE =
+  process.env.NEXT_PUBLIC_API_URL_INTERNAL || 'http://localhost:3001';
+
+export async function fetchJson<T>(path: string, init?: RequestInit): Promise<T> {
+  // Använd alltid relativ path i webbläsaren för att undvika mixed content
+  const url = typeof window === 'undefined'
+    ? (path.startsWith('http') ? path : `${API_BASE}${path}`)
+    : path;
+
+  const res = await fetch(url, {
+    ...init,
+    cache: 'no-store',
+    headers: {
+      'Content-Type': 'application/json',
+      ...(init?.headers || {}),
+    },
+  });
+
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(`API ${res.status}: ${text}`);
+  }
+
+  return res.json();
+}
+
+export { API_BASE };