diff --git a/src/handler.ts b/src/handler.ts
index 3f0f107d..67b59f28 100644
--- a/src/handler.ts
+++ b/src/handler.ts
@@ -19,14 +19,7 @@ import {
   GraphQLError,
 } from 'graphql';
 import { RequestParams } from './common';
-import {
-  areGraphQLErrors,
-  isAsyncIterable,
-  isExecutionResult,
-  isGraphQLError,
-  isObject,
-  jsonErrorReplacer,
-} from './utils';
+import { isAsyncIterable, isExecutionResult, isObject } from './utils';
 
 /**
  * The incoming request headers the implementing server should provide.
@@ -854,3 +847,35 @@ function getHeader(
   }
   return Object(req.headers)[key];
 }
+
+function areGraphQLErrors(obj: unknown): obj is readonly GraphQLError[] {
+  return (
+    Array.isArray(obj) &&
+    obj.length > 0 &&
+    // if one item in the array is a GraphQLError, we're good
+    obj.some(isGraphQLError)
+  );
+}
+
+function isGraphQLError(obj: unknown): obj is GraphQLError {
+  return obj instanceof GraphQLError;
+}
+
+function jsonErrorReplacer(
+  _key: string,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  val: any,
+) {
+  if (
+    val instanceof Error &&
+    // GraphQL errors implement their own stringer
+    !isGraphQLError(val)
+  ) {
+    return {
+      // name: val.name, name is included in message
+      message: val.message,
+      // stack: val.stack, can leak sensitive details
+    };
+  }
+  return val;
+}
diff --git a/src/utils.ts b/src/utils.ts
index 84805800..6e33c345 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -5,7 +5,6 @@
  */
 
 import type { ExecutionResult } from 'graphql';
-import { GraphQLError } from 'graphql';
 
 /** @private */
 export function extendedTypeof(
@@ -39,21 +38,6 @@ export function isObject(val: unknown): val is Record<
   return typeof val === 'object' && val !== null;
 }
 
-/** @private */
-export function areGraphQLErrors(obj: unknown): obj is readonly GraphQLError[] {
-  return (
-    Array.isArray(obj) &&
-    obj.length > 0 &&
-    // if one item in the array is a GraphQLError, we're good
-    obj.some(isGraphQLError)
-  );
-}
-
-/** @private */
-export function isGraphQLError(obj: unknown): obj is GraphQLError {
-  return obj instanceof GraphQLError;
-}
-
 /** @private */
 export function isExecutionResult(val: unknown): val is ExecutionResult {
   return (
@@ -68,23 +52,3 @@ export function isAsyncIterable<T = unknown>(
 ): val is AsyncIterable<T> {
   return typeof Object(val)[Symbol.asyncIterator] === 'function';
 }
-
-/** @private */
-export function jsonErrorReplacer(
-  _key: string,
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  val: any,
-) {
-  if (
-    val instanceof Error &&
-    // GraphQL errors implement their own stringer
-    !isGraphQLError(val)
-  ) {
-    return {
-      // name: val.name, name is included in message
-      message: val.message,
-      // stack: val.stack, can leak sensitive details
-    };
-  }
-  return val;
-}