diff --git a/packages/react-native/Libraries/Core/Devtools/openURLInBrowser.js b/packages/react-native/Libraries/Core/Devtools/openURLInBrowser.js
index 8b0b9cd4128e95..a162c562c31a9d 100644
--- a/packages/react-native/Libraries/Core/Devtools/openURLInBrowser.js
+++ b/packages/react-native/Libraries/Core/Devtools/openURLInBrowser.js
@@ -16,6 +16,9 @@ export default function openURLInBrowser(url: string) {
   // $FlowFixMe[unused-promise]
   fetch(getDevServer().url + 'open-url', {
     method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+    },
     body: JSON.stringify({url}),
   });
 }
diff --git a/packages/react-native/Libraries/Core/Devtools/symbolicateStackTrace.js b/packages/react-native/Libraries/Core/Devtools/symbolicateStackTrace.js
index 17f2a6e2c0c8eb..90c0fa85c686e1 100644
--- a/packages/react-native/Libraries/Core/Devtools/symbolicateStackTrace.js
+++ b/packages/react-native/Libraries/Core/Devtools/symbolicateStackTrace.js
@@ -42,6 +42,9 @@ export default async function symbolicateStackTrace(
   const fetch = global.fetch ?? require('../../Network/fetch');
   const response = await fetch(devServer.url + 'symbolicate', {
     method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+    },
     body: JSON.stringify({stack, extraData}),
   });
   return await response.json();