diff --git a/src/init.c b/src/init.c
index 61bfe5c..d101060 100644
--- a/src/init.c
+++ b/src/init.c
@@ -44,30 +44,35 @@ static int hyper_stop_pod(struct hyper_pod *pod);
 
 static int hyper_set_win_size(char *json, int length)
 {
-	struct hyper_win_size ws;
 	struct winsize size;
 	struct hyper_exec *exec;
 	int ret;
 
 	fprintf(stdout, "call hyper_win_size, json %s, len %d\n", json, length);
-	if (hyper_parse_winsize(&ws, json, length) < 0) {
+	JSON_Value *value = hyper_json_parse(json, length);
+	if (value == NULL) {
 		fprintf(stderr, "set term size failed\n");
-		return -1;
+		ret = -1;
+		goto out;
 	}
+	const uint64_t seq = (uint64_t)json_object_get_number(json_object(value), "seq");
 
-	exec = hyper_find_exec_by_seq(&global_pod, ws.seq);
+	exec = hyper_find_exec_by_seq(&global_pod, seq);
 	if (exec == NULL) {
-		fprintf(stdout, "can not find exec whose seq is %" PRIu64"\n", ws.seq);
-		return 0;
+		fprintf(stdout, "can not find exec whose seq is %" PRIu64"\n", seq);
+		ret = 0;
+		goto out;
 	}
 
-	size.ws_row = ws.row;
-	size.ws_col = ws.column;
+	size.ws_row = (int)json_object_get_number(json_object(value), "row");
+	size.ws_col = (int)json_object_get_number(json_object(value), "column");
 
 	ret = ioctl(exec->ptyfd, TIOCSWINSZ, &size);
 	if (ret < 0)
 		perror("cannot ioctl to set pty device term size");
 
+out:
+	json_value_free(value);
 	return ret;
 }
 
diff --git a/src/parse.c b/src/parse.c
index 379be60..7b28ce8 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -1257,68 +1257,6 @@ fail:
 	return NULL;
 }
 
-int hyper_parse_winsize(struct hyper_win_size *ws, char *json, int length)
-{
-	int i, n, ret = -1;
-	jsmn_parser p;
-	int toks_num = 10;
-	jsmntok_t *toks = NULL;
-
-	memset(ws, 0, sizeof(*ws));
-realloc:
-	toks = realloc(toks, toks_num * sizeof(jsmntok_t));
-	if (toks == NULL) {
-		fprintf(stderr, "allocate tokens for winsize failed\n");
-		goto out;
-	}
-
-	jsmn_init(&p);
-
-	n = jsmn_parse(&p, json, length,  toks, toks_num);
-	if (n < 0) {
-		fprintf(stdout, "jsmn parse failed, n is %d\n", n);
-		if (n == JSMN_ERROR_NOMEM) {
-			toks_num *= 2;
-			goto realloc;
-		}
-
-		goto out;
-	}
-
-	for (i = 0; i < n; i++) {
-		jsmntok_t *t = &toks[i];
-
-		if (t->type != JSMN_STRING)
-			continue;
-
-		if (i++ == n)
-			goto out;
-
-		if (json_token_streq(json, t, "seq")) {
-			if (toks[i].type != JSMN_PRIMITIVE)
-				goto out;
-			ws->seq = json_token_ll(json, &toks[i]);
-		} else if (json_token_streq(json, t, "row")) {
-			if (toks[i].type != JSMN_PRIMITIVE)
-				goto out;
-			ws->row = json_token_int(json, &toks[i]);
-		} else if (json_token_streq(json, t, "column")) {
-			if (toks[i].type != JSMN_PRIMITIVE)
-				goto out;
-			ws->column = json_token_int(json, &toks[i]);
-		} else {
-			fprintf(stderr, "get unknown section %s in winsize\n",
-				json_token_str(json, t));
-			goto out;
-		}
-	}
-
-	ret = 0;
-out:
-	free(toks);
-	return ret;
-}
-
 struct hyper_exec *hyper_parse_execcmd(char *json, int length)
 {
 	int i, j, n;