From b97a767af44aad50ab152c5c5d791989ff94ec31 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 25 Jan 2026 17:51:48 +0000
Subject: [PATCH 1/3] Initial plan


From f01e18a0d9c45c2999175f4139401366103a0803 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 25 Jan 2026 17:55:59 +0000
Subject: [PATCH 2/3] Add HTTPError.body support to error handlers

- Updated dev.ts and prod.ts to spread error.body properties at top level
- Added test case for HTTPError.body in test fixture
- Tests passing for both dev and prod error handlers

Co-authored-by: pi0 <5158436+pi0@users.noreply.github.com>
---
 src/runtime/internal/error/dev.ts            |  1 +
 src/runtime/internal/error/prod.ts           |  1 +
 test/fixture/server/routes/api/error-body.ts | 12 ++++++++++++
 test/tests.ts                                | 15 +++++++++++++++
 4 files changed, 29 insertions(+)
 create mode 100644 test/fixture/server/routes/api/error-body.ts

diff --git a/src/runtime/internal/error/dev.ts b/src/runtime/internal/error/dev.ts
index 8ddc60abcc..77c8374576 100644
--- a/src/runtime/internal/error/dev.ts
+++ b/src/runtime/internal/error/dev.ts
@@ -86,6 +86,7 @@ export async function defaultHandler(
         statusText: error.statusText,
         message: error.message,
         data: error.data,
+        ...error.body,
         stack: error.stack?.split("\n").map((line) => line.trim()),
       }
     : await youch.toHTML(error, {
diff --git a/src/runtime/internal/error/prod.ts b/src/runtime/internal/error/prod.ts
index 750be30fff..649f8e1895 100644
--- a/src/runtime/internal/error/prod.ts
+++ b/src/runtime/internal/error/prod.ts
@@ -62,6 +62,7 @@ export function defaultHandler(
     statusText: error.statusText,
     message: isSensitive ? "Server Error" : error.message,
     data: isSensitive ? undefined : error.data,
+    ...(isSensitive ? {} : error.body),
   };
 
   return {
diff --git a/test/fixture/server/routes/api/error-body.ts b/test/fixture/server/routes/api/error-body.ts
new file mode 100644
index 0000000000..fe215480f7
--- /dev/null
+++ b/test/fixture/server/routes/api/error-body.ts
@@ -0,0 +1,12 @@
+import { HTTPError } from "nitro/h3";
+
+export default () => {
+  throw new HTTPError({
+    status: 500,
+    message: "Custom error message",
+    data: {
+      instance: "local",
+    },
+    body: { code: "urn:nitro:missing-error-code" },
+  });
+};
diff --git a/test/tests.ts b/test/tests.ts
index b608eb6ed3..a9280b76cf 100644
--- a/test/tests.ts
+++ b/test/tests.ts
@@ -422,6 +422,21 @@ export function testNitro(
     expect(data.json.error).toBe(true);
   });
 
+  it("handles errors with body property", async () => {
+    const { status, data } = await callHandler({
+      url: "/api/error-body",
+      headers: {
+        Accept: "application/json",
+      },
+    });
+    expect(status).toBe(500);
+    expect(data.error).toBe(true);
+    expect(data.message).toBe("Custom error message");
+    expect(data.data).toEqual({ instance: "local" });
+    // Body properties should be spread at top level
+    expect(data.code).toBe("urn:nitro:missing-error-code");
+  });
+
   it.skipIf(
     // TODO!
     ctx.preset === "vercel" && ctx.nitro?.options.vercel?.entryFormat === "node" && isWindows

From 64536985cf6461b2fc6731437ec3083a852e6430 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 25 Jan 2026 17:58:35 +0000
Subject: [PATCH 3/3] Add null/undefined safety to error.body spread

- Added fallback to empty object for error.body to prevent runtime errors
- Ensures safe spreading even when error.body is null or undefined

Co-authored-by: pi0 <5158436+pi0@users.noreply.github.com>
---
 src/runtime/internal/error/dev.ts  | 2 +-
 src/runtime/internal/error/prod.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/runtime/internal/error/dev.ts b/src/runtime/internal/error/dev.ts
index 77c8374576..54eebeda5d 100644
--- a/src/runtime/internal/error/dev.ts
+++ b/src/runtime/internal/error/dev.ts
@@ -86,7 +86,7 @@ export async function defaultHandler(
         statusText: error.statusText,
         message: error.message,
         data: error.data,
-        ...error.body,
+        ...(error.body || {}),
         stack: error.stack?.split("\n").map((line) => line.trim()),
       }
     : await youch.toHTML(error, {
diff --git a/src/runtime/internal/error/prod.ts b/src/runtime/internal/error/prod.ts
index 649f8e1895..9af69471b7 100644
--- a/src/runtime/internal/error/prod.ts
+++ b/src/runtime/internal/error/prod.ts
@@ -62,7 +62,7 @@ export function defaultHandler(
     statusText: error.statusText,
     message: isSensitive ? "Server Error" : error.message,
     data: isSensitive ? undefined : error.data,
-    ...(isSensitive ? {} : error.body),
+    ...(isSensitive ? {} : error.body || {}),
   };
 
   return {