From 9359a8d65fdff4460d01d652ccafd31507c6c426 Mon Sep 17 00:00:00 2001
From: Sidharth Ajithkumar <sidharthajithkumar@gmail.com>
Date: Thu, 25 Aug 2022 15:25:53 +0530
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Preserve=20`json.JSONDecodeError`?=
 =?UTF-8?q?=20information=20when=20handling=20invalid=20JSON=20in=20reques?=
 =?UTF-8?q?t=20body,=20to=20support=20custom=20exception=20handlers=20that?=
 =?UTF-8?q?=20use=20its=20information=20(#4057)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 fastapi/routing.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fastapi/routing.py b/fastapi/routing.py
index 80bd53279a31f..8f4d0fa7ef578 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -209,7 +209,9 @@ async def app(request: Request) -> Response:
                         else:
                             body = body_bytes
         except json.JSONDecodeError as e:
-            raise RequestValidationError([ErrorWrapper(e, ("body", e.pos))], body=e.doc)
+            raise RequestValidationError(
+                [ErrorWrapper(e, ("body", e.pos))], body=e.doc
+            ) from e
         except Exception as e:
             raise HTTPException(
                 status_code=400, detail="There was an error parsing the body"