diff --git a/lib/std/collections/object.c3 b/lib/std/collections/object.c3
index a0ae74456..9c2b4ff7b 100644
--- a/lib/std/collections/object.c3
+++ b/lib/std/collections/object.c3
@@ -48,9 +48,9 @@ fn usz! Object.to_format(&self, Formatter* formatter) @dynamic
 			return n;
 		case ObjectInternalMap:
 			usz n = formatter.printf("{")!;
-			@pool()
+			@stack_mem(1024; Allocator mem)
 			{
-				foreach (i, key : self.map.key_tlist())
+				foreach (i, key : self.map.key_new_list(mem))
 				{
 					if (i > 0) n += formatter.printf(",")!;
 					n += formatter.printf(`"%s":`, key)!;
diff --git a/lib/std/core/dstring.c3 b/lib/std/core/dstring.c3
index bb9012002..406014ef8 100644
--- a/lib/std/core/dstring.c3
+++ b/lib/std/core/dstring.c3
@@ -371,18 +371,24 @@ fn void DString.insert_at(&self, usz index, String s)
 
 fn usz! DString.appendf(&self, String format, args...) @maydiscard
 {
-	Formatter formatter;
-	formatter.init(&out_string_append_fn, self);
-	return formatter.vprintf(format, args);
+	@pool(self.data().allocator)
+	{
+		Formatter formatter;
+		formatter.init(&out_string_append_fn, self);
+		return formatter.vprintf(format, args);
+	};
 }
 
 fn usz! DString.appendfn(&self, String format, args...) @maydiscard
 {
-	Formatter formatter;
-	formatter.init(&out_string_append_fn, self);
-	usz len = formatter.vprintf(format, args)!;
-	self.append('\n');
-	return len + 1;
+	@pool(self.data().allocator)
+	{
+		Formatter formatter;
+		formatter.init(&out_string_append_fn, self);
+		usz len = formatter.vprintf(format, args)!;
+		self.append('\n');
+		return len + 1;
+	};
 }
 
 fn DString new_join(String[] s, String joiner, Allocator allocator = allocator::heap())
diff --git a/lib/std/encoding/json.c3 b/lib/std/encoding/json.c3
index cbd014414..b6e6bbf83 100644
--- a/lib/std/encoding/json.c3
+++ b/lib/std/encoding/json.c3
@@ -15,11 +15,29 @@ fault JsonParsingError
 	INVALID_NUMBER,
 }
 
+fn Object*! parse_string(String s, Allocator allocator = allocator::heap())
+{
+	return parse(ByteReader{}.init(s), allocator);
+}
+
+fn Object*! temp_parse_string(String s)
+{
+	return parse(ByteReader{}.init(s), allocator::temp());
+}
+
 fn Object*! parse(InStream s, Allocator allocator = allocator::heap())
 {
 	JsonContext context = { .last_string = dstring::new_with_capacity(64, allocator), .stream = s, .allocator = allocator };
 	defer context.last_string.free();
-	return parse_any(&context);
+	@pool(allocator)
+	{
+		return parse_any(&context);
+	};
+}
+
+fn Object*! temp_parse(InStream s)
+{
+	return parse(s, allocator::temp());
 }
 
 // -- Implementation follows --
diff --git a/test/unit/stdlib/encoding/json.c3 b/test/unit/stdlib/encoding/json.c3
index 67fdf58e6..811df74fd 100644
--- a/test/unit/stdlib/encoding/json.c3
+++ b/test/unit/stdlib/encoding/json.c3
@@ -24,4 +24,30 @@ fn void! simple_test2()
 	reader.init(`{"jsonrpc":"2.0","id":null,"method":"initialize"}`);
 	Object* o = json::parse(&reader)!;
 	defer o.free();
-}
\ No newline at end of file
+}
+
+
+fn void! test_string()
+{
+	Object* o = json::parse_string(`{"jsonrpc":"2","id":null,"method":"initialize"}`)!;
+	defer o.free();
+	String s = string::tformat("%s", *o);
+	Object* o2 = json::parse_string(s)!;
+	defer o2.free();
+	String s2 = string::tformat("%s", *o2);
+	assert(s2 == s, "Unexpectedly got %s and not %s", s2, s);
+}
+
+fn void! test_temp_string()
+{
+	@pool()
+	{
+		Object* o = json::temp_parse_string(`{"jsonrpc":"2","id":null,"method":"initialize"}`)!;
+		defer o.free();
+		String s = string::tformat("%s", *o);
+		Object* o2 = json::temp_parse_string(s)!;
+		defer o2.free();
+		String s2 = string::tformat("%s", *o2);
+		assert(s2 == s, "Unexpectedly got %s and not %s", s2, s);
+	};
+}