diff --git a/src/handlers/auth.ts b/src/handlers/auth.ts
index 2d2bcafa3..26919b61c 100644
--- a/src/handlers/auth.ts
+++ b/src/handlers/auth.ts
@@ -6,6 +6,7 @@ import { HandleCallback } from './callback';
 import { HandleProfile } from './profile';
 import { HandlerError } from '../utils/errors';
 import { AppRouteHandlerFn, AppRouteHandlerFnContext, Handler } from './router-helpers';
+import { isRequest } from '../utils/req-helpers';
 
 /**
  * If you want to add some custom behavior to the default auth handlers, you can pass in custom handlers for
@@ -183,7 +184,7 @@ export default function handlerFactory({
     const pageRouteHandler = pageRouteHandlerFactory(customHandlers, onError as PageRouterOnError);
 
     return (req: NextRequest | NextApiRequest, resOrCtx: NextApiResponse | AppRouteHandlerFnContext) => {
-      if ('params' in resOrCtx) {
+      if (isRequest(req)) {
         return appRouteHandler(req as NextRequest, resOrCtx as AppRouteHandlerFnContext);
       }
       return pageRouteHandler(req as NextApiRequest, resOrCtx as NextApiResponse);
diff --git a/src/handlers/router-helpers.ts b/src/handlers/router-helpers.ts
index 39edf0aed..ff36aa671 100644
--- a/src/handlers/router-helpers.ts
+++ b/src/handlers/router-helpers.ts
@@ -1,5 +1,6 @@
 import { NextRequest } from 'next/server';
 import { NextApiRequest, NextApiResponse } from 'next';
+import { isRequest } from '../utils/req-helpers';
 
 export type AppRouteHandlerFnContext = {
   params: Record<string, string | string[]>;
@@ -65,16 +66,18 @@ export const getHandler =
     resOrCtx: NextApiResponse | AppRouteHandlerFnContext,
     options?: Opts
   ) => {
-    if (reqOrOptions instanceof Request) {
-      return appRouteHandler(reqOrOptions, resOrCtx as AppRouteHandlerFnContext, options);
+    if (isRequest(reqOrOptions)) {
+      return appRouteHandler(reqOrOptions as NextRequest, resOrCtx as AppRouteHandlerFnContext, options);
     }
     if ('socket' in reqOrOptions) {
       return pageRouteHandler(reqOrOptions as NextApiRequest, resOrCtx as NextApiResponse, options);
     }
     return (req: NextApiRequest | NextRequest, resOrCtxInner: NextApiResponse | AppRouteHandlerFnContext) => {
-      const opts = typeof reqOrOptions === 'function' ? (reqOrOptions as OptionsProvider<Opts>)(req) : reqOrOptions;
+      const opts = (
+        typeof reqOrOptions === 'function' ? (reqOrOptions as OptionsProvider<Opts>)(req) : reqOrOptions
+      ) as Opts;
 
-      if (req instanceof Request) {
+      if (isRequest(req)) {
         return appRouteHandler(req as NextRequest, resOrCtxInner as AppRouteHandlerFnContext, opts);
       }
       return pageRouteHandler(req as NextApiRequest, resOrCtxInner as NextApiResponse, opts);
diff --git a/src/helpers/with-api-auth-required.ts b/src/helpers/with-api-auth-required.ts
index b9d7a3c40..d3c6adf11 100644
--- a/src/helpers/with-api-auth-required.ts
+++ b/src/helpers/with-api-auth-required.ts
@@ -2,6 +2,7 @@ import { NextApiResponse, NextApiRequest, NextApiHandler } from 'next';
 import { NextRequest, NextResponse } from 'next/server';
 import { get, SessionCache } from '../session';
 import { assertReqRes } from '../utils/assert';
+import { isRequest } from '../utils/req-helpers';
 
 /**
  * This contains `param`s, which is an object containing the dynamic route parameters for the current route.
@@ -90,8 +91,11 @@ export default function withApiAuthFactory(sessionCache: SessionCache): WithApiA
 
   return (apiRoute: AppRouteHandlerFn | NextApiHandler): any =>
     (req: NextRequest | NextApiRequest, resOrParams: AppRouteHandlerFnContext | NextApiResponse) => {
-      if (req instanceof Request) {
-        return appRouteHandler(apiRoute as AppRouteHandlerFn)(req, resOrParams as AppRouteHandlerFnContext);
+      if (isRequest(req)) {
+        return appRouteHandler(apiRoute as AppRouteHandlerFn)(
+          req as NextRequest,
+          resOrParams as AppRouteHandlerFnContext
+        );
       }
       return (pageRouteHandler as WithApiAuthRequiredPageRoute)(apiRoute as NextApiHandler)(
         req as NextApiRequest,
diff --git a/src/session/cache.ts b/src/session/cache.ts
index 97409fefa..6bbc4f40c 100644
--- a/src/session/cache.ts
+++ b/src/session/cache.ts
@@ -13,16 +13,17 @@ import {
   Auth0NextRequest,
   Auth0NextResponse
 } from '../http';
+import { isNextApiRequest, isRequest } from '../utils/req-helpers';
 
 type Req = IncomingMessage | NextRequest | NextApiRequest;
 type Res = ServerResponse | NextResponse | NextApiResponse;
 
 const getAuth0Req = (req: Req) => {
-  if (typeof Request !== undefined && req instanceof Request) {
-    return new Auth0NextRequest(req);
+  if (isRequest(req)) {
+    return new Auth0NextRequest(req as NextRequest);
   }
-  if ('previewData' in req) {
-    return new Auth0NextApiRequest(req);
+  if (isNextApiRequest(req)) {
+    return new Auth0NextApiRequest(req as NextApiRequest);
   }
   return new NodeRequest(req as IncomingMessage);
 };
diff --git a/src/utils/req-helpers.ts b/src/utils/req-helpers.ts
new file mode 100644
index 000000000..90bdf52e4
--- /dev/null
+++ b/src/utils/req-helpers.ts
@@ -0,0 +1,13 @@
+import type { IncomingMessage } from 'http';
+import { NextApiRequest } from 'next';
+import { NextRequest } from 'next/server';
+
+type Req = IncomingMessage | NextApiRequest | NextRequest | Request | Record<string, any>;
+
+export const isRequest = (req: Req): boolean => {
+  return req instanceof Request || req.headers instanceof Headers;
+};
+
+export const isNextApiRequest = (req: Req) => {
+  return !isRequest(req) && 'query' in req;
+};
diff --git a/tests/utils/req-helpers.test.ts b/tests/utils/req-helpers.test.ts
new file mode 100644
index 000000000..6900125c3
--- /dev/null
+++ b/tests/utils/req-helpers.test.ts
@@ -0,0 +1,34 @@
+import { Socket } from 'net';
+import { IncomingMessage } from 'http';
+import { NextRequest } from 'next/server';
+import { isRequest, isNextApiRequest } from '../../src/utils/req-helpers';
+
+describe('req-helpers', () => {
+  const req = new Request(new URL('http://example.com'));
+  const reqNode16 = new Proxy(req, {});
+  const reqNext = new NextRequest(new URL('http://example.com'));
+  const nodeReq = new IncomingMessage(new Socket());
+  class NextApiRequest extends IncomingMessage {
+    constructor() {
+      super(new Socket());
+    }
+    query = {};
+  }
+  const nextApiReq = new NextApiRequest();
+
+  test('#isRequest', () => {
+    expect(isRequest(req)).toBe(true);
+    expect(isRequest(reqNode16)).toBe(true);
+    expect(isRequest(reqNext)).toBe(true);
+    expect(isRequest(nodeReq)).toBe(false);
+    expect(isRequest(nextApiReq)).toBe(false);
+  });
+
+  test('#isNextApiRequest', () => {
+    expect(isNextApiRequest(req)).toBe(false);
+    expect(isNextApiRequest(reqNode16)).toBe(false);
+    expect(isNextApiRequest(reqNext)).toBe(false);
+    expect(isNextApiRequest(nodeReq)).toBe(false);
+    expect(isNextApiRequest(nextApiReq)).toBe(true);
+  });
+});