diff --git a/React/Base/RCTConstants.h b/React/Base/RCTConstants.h
index f199450a4c9..217b7aabc21 100644
--- a/React/Base/RCTConstants.h
+++ b/React/Base/RCTConstants.h
@@ -75,3 +75,9 @@ RCT_EXTERN void RCTSetValidateCanSendEventInRCTEventEmitter(BOOL value);
  */
 RCT_EXTERN BOOL RCTGetMemoryPressureUnloadLevel(void);
 RCT_EXTERN void RCTSetMemoryPressureUnloadLevel(int value);
+
+/*
+ * Parse JS stack for unhandled JS errors caught in C++
+ */
+RCT_EXTERN BOOL RCTGetParseUnhandledJSErrorStackNatively(void);
+RCT_EXTERN void RCTSetParseUnhandledJSErrorStackNatively(BOOL value);
diff --git a/React/Base/RCTConstants.m b/React/Base/RCTConstants.m
index d0bf96dc27c..03e5ffe984c 100644
--- a/React/Base/RCTConstants.m
+++ b/React/Base/RCTConstants.m
@@ -65,3 +65,19 @@ void RCTSetMemoryPressureUnloadLevel(int value)
 {
   RCTMemoryPressureUnloadLevel = value;
 }
+
+/*
+ * In Bridge mode, parse the JS stack for unhandled JS errors, to display in RedBox.
+ * When false (previous default behavior), a native stack is displayed in the RedBox.
+ */
+static BOOL RCTParseUnhandledJSErrorStackNatively = NO;
+
+BOOL RCTGetParseUnhandledJSErrorStackNatively()
+{
+  return RCTParseUnhandledJSErrorStackNatively;
+}
+
+void RCTSetParseUnhandledJSErrorStackNatively(BOOL value)
+{
+  RCTParseUnhandledJSErrorStackNatively = value;
+}