From 56e5319e096f282a99cb008f3086f083dc782992 Mon Sep 17 00:00:00 2001
From: blaine-arcjet <146491715+blaine-arcjet@users.noreply.github.com>
Date: Mon, 4 Nov 2024 14:02:18 -0700
Subject: [PATCH] fix(arcjet): Log error message when fingerprint cannot be
 built (#2139)

Closes #2138

We can't `JSON.stringify` an error object, so this pulls the error message out of the object and assigns it to the `error` property on the logger props object.
---
 arcjet/index.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arcjet/index.ts b/arcjet/index.ts
index c6107a924..98324a223 100644
--- a/arcjet/index.ts
+++ b/arcjet/index.ts
@@ -1309,15 +1309,19 @@ export default function arcjet<
       );
       log.debug("fingerprint (%s): %s", rt, fingerprint);
     } catch (error) {
+      const errMsg = errorMessage(error);
       log.error(
-        { error },
+        {
+          // Workaround for inability to JSON.stringify Error objects
+          error: errMsg,
+        },
         "Failed to build fingerprint. Please verify your Characteristics.",
       );
 
       const decision = new ArcjetErrorDecision({
         ttl: 0,
         reason: new ArcjetErrorReason(
-          `Failed to build fingerprint - ${errorMessage(error)}`,
+          `Failed to build fingerprint - ${errMsg}`,
         ),
         // No results because we couldn't create a fingerprint
         results: [],