allow to use default fetcher for requests that return an empty response

src/createZodFetcher.test.ts

@@ -31,6 +31,23 @@ it("Should create a default fetcher", async () => {
   });
 });
 
+it("Should successfully parse empty responses with the default fetcher", async () => {
+  server.use(
+    rest.get("https://example.com", (req, res, ctx) => {
+      return res(ctx.status(200));
+    }),
+  );
+
+  const fetchWithZod = createZodFetcher();
+
+  const response = await fetchWithZod(
+    z.undefined(),
+    "https://example.com",
+  );
+
+  expect(response).toBeUndefined();
+});
+
 it("Should throw an error with mis-matched schemas with a default fetcher", async () => {
   server.use(
     rest.get("https://example.com", (req, res, ctx) => {

src/createZodFetcher.ts

@@ -31,7 +31,8 @@ export const defaultFetcher = async (...args: Parameters<typeof fetch>) => {
     throw new Error(`Request failed with status ${response.status}`);
   }
 
-  return response.json();
+  // workaround since `.json()` would throw on empty responses
+  return response.text().then((text) => (text.length ? JSON.parse(text) : undefined))
 };
 
 /**