diff --git a/src/next-edge/index.test.ts b/src/next-edge/index.test.ts
index 2448823..6bcf688 100644
--- a/src/next-edge/index.test.ts
+++ b/src/next-edge/index.test.ts
@@ -17,7 +17,7 @@ function createApp(options: CreateApiHandlerOptions): AppResult {
 
   const handler = createApiHandler({
     apiBaseUrlOverride:
-        "https://youthful-feynman-ml50dfb20g.projects.staging.oryapis.dev",
+      "https://youthful-feynman-ml50dfb20g.projects.staging.oryapis.dev",
     ...options,
   })
   const router = express.Router()
diff --git a/src/next-edge/index.ts b/src/next-edge/index.ts
index 052a974..3c9bed9 100644
--- a/src/next-edge/index.ts
+++ b/src/next-edge/index.ts
@@ -1,4 +1,3 @@
-import { Buffer } from "buffer"
 import { SerializeOptions as CookieSerializeOptions, serialize } from "cookie"
 import { IncomingHttpHeaders } from "http"
 import { isText } from "istextorbinary"
@@ -10,6 +9,15 @@ import { defaultForwardedHeaders } from "../common/default-forwarded-headers"
 import { processLocationHeader } from "../common/process-location-header"
 import { guessCookieDomain } from "../common/get-cookie-domain"
 
+function readRawBody(req: NextApiRequest): Promise<Buffer> {
+  return new Promise((resolve, reject) => {
+    const chunks: Uint8Array[] = []
+    req.on("data", (chunk) => chunks.push(chunk))
+    req.on("end", () => resolve(Buffer.concat(chunks)))
+    req.on("error", (err) => reject(err))
+  })
+}
+
 export function filterRequestHeaders(
   headers: IncomingHttpHeaders,
   forwardAdditionalHeaders?: string[],
@@ -112,7 +120,7 @@ export function createApiHandler(options: CreateApiHandlerOptions) {
       headers,
       body:
         req.method !== "GET" && req.method !== "HEAD"
-          ? JSON.stringify(req.body)
+          ? await readRawBody(req)
           : null,
       redirect: "manual",
     })