Use base64url to decode clientDataJSON

1 files changed, 3 insertions, 3 deletions

diff --git a/packages/server/src/helpers/decodeClientDataJSON.ts b/packages/server/src/helpers/decodeClientDataJSON.ts
index 7c09b0d..52bbf4c 100644
--- a/packages/server/src/helpers/decodeClientDataJSON.ts
+++ b/packages/server/src/helpers/decodeClientDataJSON.ts
@@ -7,9 +7,9 @@ export default function decodeClientDataJSON(data: string): ClientDataJSON {
   const toString = base64url.decode(data);
   const clientData: ClientDataJSON = JSON.parse(toString);
 
-  // `challenge` will be Base64URL-encoded here. Decode it for easier comparisons with what is provided
-  // as the expected value
-  clientData.challenge = Buffer.from(clientData.challenge, 'base64').toString('ascii');
+  // `challenge` will be Base64URL-encoded here. Decode it for easier comparisons with what is
+  // provided as the expected value
+  clientData.challenge = base64url.decode(clientData.challenge);
 
   return clientData;
 }