diff --git a/functions/getSassyHashes/index.ts b/functions/getSassyHashes/index.ts
index 10ed93d..8d3e27f 100644
--- a/functions/getSassyHashes/index.ts
+++ b/functions/getSassyHashes/index.ts
@@ -1,5 +1,6 @@
 import { PrivyClient } from '@privy-io/server-auth';
 import { Client, fetchExchange, gql } from '@urql/core';
+import { parse } from 'cookie';
 
 import { Env } from '../common';
 
@@ -17,23 +18,15 @@ interface SassyHashRequest {
   castHash: string;
 }
 
-const getPrivyIdToken = async (cookies: string | undefined) => {
-  if (!cookies) return null;
-  const privyIdToken = cookies.match(/privy_id_token=(?<privyIdToken>.*)/)?.groups?.privyIdToken;
-  if (!privyIdToken) return null;
-  return privyIdToken;
-};
-
-const getFid = async (privyAuthToken: string, context): Promise<number> => {
+const getFid = async (context, privyAuthToken: string): Promise<number> => {
   const { env, request } = context;
   const privy = new PrivyClient(env.REACT_APP_PRIVY_APP_ID, env.PRIVY_APP_SECRET);
 
-  const cookies = request.headers.get('cookie');
-
-  const privyIdToken = await getPrivyIdToken(cookies);
-  console.log('privyIdToken:', privyIdToken);
+  const cookie = parse(request.headers.get('Cookie') || '');
+  const idToken = cookie['privy-id-token'] != null ? cookie['privy-id-token'] : undefined;
 
-  const user = await privy.getUser({ idToken: privyIdToken });
+  const user = await privy.getUser({ idToken });
+  console.log('privyIdToken:', idToken);
   console.log('user:', user);
 
   try {
@@ -81,7 +74,7 @@ export const onRequestPost: PagesFunction<Env> = async (context) => {
   const js = (await request.json()) as SassyHashRequest;
   const { privyAuthToken, castHash } = js;
 
-  const fid = await getFid(privyAuthToken, context);
+  const fid = await getFid(context, privyAuthToken);
   if (!fid) return new Response(JSON.stringify({ error: 'Failed to fetch Farcaster FID' }), { status: 500 });
 
   const sassyHashResponses = await fetchSassyHashExpensiveApi(fid, castHash, env);
diff --git a/package.json b/package.json
index 1733a10..669c57d 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "antd-style": "^3.6.2",
     "axios": "^0.24.0",
     "axios-mock-adapter": "^1.20.0",
+    "cookie": "^1.0.1",
     "country-list": "^2.3.0",
     "dayjs": "^1.11.0",
     "echarts": "^5.1.2",
diff --git a/yarn.lock b/yarn.lock
index 9713c41..b74f552 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7745,6 +7745,7 @@ __metadata:
     antd-style: ^3.6.2
     axios: ^0.24.0
     axios-mock-adapter: ^1.20.0
+    cookie: ^1.0.1
     country-list: ^2.3.0
     dayjs: ^1.11.0
     echarts: ^5.1.2
@@ -8618,6 +8619,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"cookie@npm:^1.0.1":
+  version: 1.0.1
+  resolution: "cookie@npm:1.0.1"
+  checksum: e2ff4879d816ea27dab69651c06d328b1f4214ccefa1023b6ebf85787bc23b3cad777ed51b4e54c01d161c374a05fc86e45e51ee3d9fafb48a836439c56b2458
+  languageName: node
+  linkType: hard
+
 "copy-anything@npm:^2.0.1":
   version: 2.0.6
   resolution: "copy-anything@npm:2.0.6"