Fix #31277

src/vs/base/common/json.ts

@@ -961,6 +961,9 @@ export function visit(text: string, visitor: JSONVisitor, options?: ParseOptions
 				}
 				onSeparator(',');
 				scanNext(); // consume comma
+				if (_scanner.getToken() === SyntaxKind.CloseBracketToken && allowTrailingComma) {
+					break;
+				}
 			} else if (needsComma) {
 				handleError(ParseErrorCode.CommaExpected, [], []);
 			}

src/vs/base/test/common/json.test.ts

@@ -234,6 +234,7 @@ suite('JSON', () => {
 		assertValidParse('{ "hello": [] }', { hello: [] }, options);
 		assertValidParse('{ "hello": [], "world": {}, }', { hello: [], world: {} }, options);
 		assertValidParse('{ "hello": [], "world": {} }', { hello: [], world: {} }, options);
+		assertValidParse('{ "hello": [1,] }', { hello: [1] }, options);
 
 		assertInvalidParse('{ "hello": [], }', { hello: [] });
 		assertInvalidParse('{ "hello": [], "world": {}, }', { hello: [], world: {} });