From db70b7fcc57e6a326ea16320a6371f60e85f9c89 Mon Sep 17 00:00:00 2001
From: Nicolas Morel <nicolas@morel.io>
Date: Wed, 1 Jul 2026 14:29:41 +0200
Subject: [PATCH] fix: strip leading UTF-8 BOM

Fixes #28
---
 src/index.js  | 5 +++++
 test/index.js | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/src/index.js b/src/index.js
index e2b793e..e5c24fc 100755
--- a/src/index.js
+++ b/src/index.js
@@ -8,6 +8,11 @@ export function parse(text, ...args) {
     const reviver = args.length > 1 || !firstOptions ? args[0] : undefined;
     const options = (args.length > 1 && args[1]) || firstOptions || {};
 
+    // Strip a leading UTF-8 BOM
+    if (typeof text === 'string' && text.charCodeAt(0) === 0xfeff) {
+        text = text.slice(1);
+    }
+
     // Parse normally, allowing exceptions
 
     const obj = JSON.parse(text, reviver);
diff --git a/test/index.js b/test/index.js
index 19dc0d3..411004e 100755
--- a/test/index.js
+++ b/test/index.js
@@ -91,6 +91,10 @@ describe('Bourne', () => {
             );
         });
 
+        it('ignores leading BOM', () => {
+            expect(Bourne.parse('\uFEFF{"a": 5, "b": 6}')).toEqual({ a: 5, b: 6 });
+        });
+
         it('errors on proto property (unicode)', () => {
             expect(() => Bourne.parse('{ "a": 5, "b": 6, "\\u005f_proto__": { "x": 7 } }')).toThrow(SyntaxError);
             expect(() => Bourne.parse('{ "a": 5, "b": 6, "_\\u005fp\\u0072oto__": { "x": 7 } }')).toThrow(SyntaxError);