diff --git a/packages/http-client/src/index.d.ts b/packages/http-client/src/index.d.ts
index 35bdc41498..e490f98882 100644
--- a/packages/http-client/src/index.d.ts
+++ b/packages/http-client/src/index.d.ts
@@ -8,14 +8,16 @@ export type Page = {
   id: string;
   root: [string, string];
 };
-export type Project = {
-  [string]:
-    | {
-        page: Page;
-        tree: BaseInstance;
-        props: Array<UserProp> | [];
-        breakpoints: Array<Breakpoint> | null;
-        css: string;
-      }
-    | string;
-};
+export type Project =
+  | {
+      pages: {
+        [string]: {
+          page: Page;
+          tree: BaseInstance;
+          props: Array<UserProp> | [];
+          breakpoints: Array<Breakpoint> | null;
+          css: string;
+        };
+      };
+    }
+  | Error;
diff --git a/packages/http-client/src/index.test.ts b/packages/http-client/src/index.test.ts
index cb372d45fa..bdf0120436 100644
--- a/packages/http-client/src/index.test.ts
+++ b/packages/http-client/src/index.test.ts
@@ -13,6 +13,9 @@ describe("getProjectDetails", () => {
       apiUrl,
       projectId: morePagesProjectId,
     });
+    if (response instanceof Error) {
+      throw response;
+    }
     expect(Object.keys(response.pages).length > 1).toBeTruthy();
   });
   test("does not include pages", async () => {
@@ -20,6 +23,9 @@ describe("getProjectDetails", () => {
       apiUrl,
       projectId: onlyHomeProjectId,
     });
+    if (response instanceof Error) {
+      throw response;
+    }
     expect(Object.keys(response.pages).length === 1).toBeTruthy();
   });
   test("loads existing project", async () => {
diff --git a/packages/http-client/src/index.ts b/packages/http-client/src/index.ts
index 21ae3a2fa2..2c497122f3 100644
--- a/packages/http-client/src/index.ts
+++ b/packages/http-client/src/index.ts
@@ -7,7 +7,7 @@ export const loadProject = async ({
 }: {
   apiUrl: string;
   projectId: string;
-}): Promise<Project | string> => {
+}): Promise<Project> => {
   try {
     if (apiUrl === undefined) {
       throw new Error("Webstudio API URL is required.");
@@ -24,6 +24,6 @@ export const loadProject = async ({
     if (error instanceof Error) {
       return error;
     }
-    return "Unknown error";
+    return new Error("Unknown error");
   }
 };