From 7493c803f0efe11826f4de043948a9e843bd32e2 Mon Sep 17 00:00:00 2001
From: Suyog241005 <suyoghabbu@gmail.com>
Date: Sun, 24 May 2026 09:22:19 +0530
Subject: [PATCH] fix: avoid trailing comma in jsonStringify when replacer
 skips last property

---
 lib/common.js         |  9 +++++----
 lib/stringify.spec.ts | 14 ++++++++++++++
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/lib/common.js b/lib/common.js
index 28183cdf..bc517102 100644
--- a/lib/common.js
+++ b/lib/common.js
@@ -126,15 +126,16 @@ const stringifyObject = (value, replacer, space, pointer, depth) => {
   const colonSpacing = space ? " " : "";
 
   let result = "{" + padding + space;
-  for (let index = 0; index < entries.length; index++) {
-    const [key, value] = entries[index];
+  let first = true;
+  for (const [key, value] of entries) {
     const keyPointer = JsonPointer.append(key, pointer);
     const stringifiedValue = stringifyValue(value, replacer, space, key, keyPointer, depth + 1);
     if (stringifiedValue !== undefined) {
-      result += JSON.stringify(key) + ":" + colonSpacing + stringifiedValue;
-      if (entries[index + 1]) {
+      if (!first) {
         result += `,${padding}${space}`;
       }
+      first = false;
+      result += JSON.stringify(key) + ":" + colonSpacing + stringifiedValue;
     }
   }
   return result + padding + "}";
diff --git a/lib/stringify.spec.ts b/lib/stringify.spec.ts
index b61c80fc..1566c09d 100644
--- a/lib/stringify.spec.ts
+++ b/lib/stringify.spec.ts
@@ -39,6 +39,20 @@ describe("Json.stringify", () => {
       expect(jsonStringify(value, replacer)).to.eql(JSON.stringify(value, replacer));
     });
 
+    it("should remove the last property when it returns undefined without leaving a trailing comma", () => {
+      const value = {
+        aaa: "foo",
+        bbb: "bar"
+      };
+      const replacer = (key: string, value: unknown) => {
+        if (key !== "bbb") {
+          return value;
+        }
+      };
+
+      expect(jsonStringify(value, replacer)).to.eql(JSON.stringify(value, replacer));
+    });
+
     it("should remove items that return undefined", () => {
       const value = ["foo", "bar"];
       const replacer = (key: string, value: unknown) => {