work around vrchat json parser bug

This reverts commit 720640b054.

app.js

@@ -26,15 +26,10 @@ router.get("/search", async ctx => {
 
 	var options = {
 		thumbnails: stringToBoolean(ctx.query.thumbnails),
-		icons: stringToBoolean(ctx.query.icons),
-		ascii: stringToBoolean(ctx.query.ascii)
+		icons: stringToBoolean(ctx.query.icons)
 	};
 
 	ctx.body = await cachedVRCYoutubeSearch(ctx.query.pool, query, options);
-
-	if (options.ascii) {
-		ctx.body = JSON.stringify(ctx.body).replace(/[\u007F-\uFFFF]/g, chr => "\\u" + ("0000" + chr.charCodeAt(0).toString(16)).slice(-4));
-	}
 });
 
 
@@ -80,5 +75,23 @@ router.get("/", ctx => {
 
 
 
+// work around vrchat json parser bug https://feedback.vrchat.com/udon/p/braces-inside-strings-in-vrcjson-can-fail-to-deserialize
+app.use(async (ctx, next) => {
+	await next();
+	if (ctx.type != "application/json") return;
+	ctx.body = structuredClone(ctx.body);
+	(function iterateObject(obj) {
+		for (var key in obj) {
+			if (typeof obj[key] == "string") {
+				obj[key] = obj[key].replace(/[\[\]{}]/g, chr => "\\u" + chr.charCodeAt(0).toString(16).padStart(4, '0'));
+			} else if (typeof obj[key] == "object") {
+				iterateObject(obj[key]);
+			}
+		}
+	})(ctx.body);
+	ctx.body = JSON.stringify(ctx.body).replaceAll("\\\\u", "\\u");
+	ctx.type = "json";
+});
+
 app.use(router.routes());
 app.use(router.allowedMethods());