diff --git a/mesh/mesh-config-json.c b/mesh/mesh-config-json.c
index 63b6c3988..30c90170d 100644
--- a/mesh/mesh-config-json.c
+++ b/mesh/mesh-config-json.c
@@ -249,21 +249,31 @@ static void jarray_string_del(json_object *jarray, char *str, size_t len)
 	}
 }
 
+static bool get_key_index(json_object *jobj, const char *keyword,
+								uint16_t *index)
+{
+	int idx;
+
+	if (!get_int(jobj, keyword, &idx))
+		return false;
+
+	if (!CHECK_KEY_IDX_RANGE(idx))
+		return false;
+
+	*index = (uint16_t) idx;
+	return true;
+}
+
 static json_object *get_key_object(json_object *jarray, uint16_t idx)
 {
 	int i, sz = json_object_array_length(jarray);
 
 	for (i = 0; i < sz; ++i) {
-		json_object *jentry, *jvalue;
-		const char *str;
+		json_object *jentry;
 		uint16_t jidx;
 
 		jentry = json_object_array_get_idx(jarray, i);
-		if (!json_object_object_get_ex(jentry, "index", &jvalue))
-			return NULL;
-
-		str = json_object_get_string(jvalue);
-		if (sscanf(str, "%04hx", &jidx) != 1)
+		if (!get_key_index(jentry, "index", &jidx))
 			return NULL;
 
 		if (jidx == idx)
@@ -273,28 +283,6 @@ static json_object *get_key_object(json_object *jarray, uint16_t idx)
 	return NULL;
 }
 
-static bool get_key_index(json_object *jobj, const char *keyword,
-								uint16_t *index)
-{
-	uint16_t idx;
-	json_object *jvalue;
-	const char *str;
-
-	if (!json_object_object_get_ex(jobj, keyword, &jvalue))
-		return false;
-
-	str = json_object_get_string(jvalue);
-
-	if (sscanf(str, "%04hx", &idx) != 1)
-		return false;
-
-	if (!CHECK_KEY_IDX_RANGE(idx))
-		return false;
-
-	*index = (uint16_t) idx;
-	return true;
-}
-
 static void jarray_key_del(json_object *jarray, int16_t idx)
 {
 	int i, sz = json_object_array_length(jarray);
@@ -594,11 +582,23 @@ fail:
 	return false;
 }
 
+static bool write_int(json_object *jobj, const char *desc, int val)
+{
+	json_object *jvalue;
+
+	jvalue = json_object_new_int(val);
+	if (!jvalue)
+		return false;
+
+	json_object_object_del(jobj, desc);
+	json_object_object_add(jobj, desc, jvalue);
+	return true;
+}
+
 bool mesh_config_net_key_add(struct mesh_config *cfg, uint16_t idx,
 							const uint8_t key[16])
 {
-	json_object *jnode, *jarray = NULL, *jentry = NULL, *jstring;
-	char buf[5];
+	json_object *jnode, *jarray = NULL, *jentry = NULL;
 
 	if (!cfg)
 		return false;
@@ -618,13 +618,9 @@ bool mesh_config_net_key_add(struct mesh_config *cfg, uint16_t idx,
 	if (!jentry)
 		return false;
 
-	snprintf(buf, 5, "%4.4x", idx);
-	jstring = json_object_new_string(buf);
-	if (!jstring)
+	if (!write_int(jentry, "index", idx))
 		goto fail;
 
-	json_object_object_add(jentry, "index", jstring);
-
 	if (!add_key_value(jentry, "key", key))
 		goto fail;
 
@@ -724,8 +720,7 @@ bool mesh_config_write_token(struct mesh_config *cfg, uint8_t *token)
 bool mesh_config_app_key_add(struct mesh_config *cfg, uint16_t net_idx,
 					uint16_t app_idx, const uint8_t key[16])
 {
-	json_object *jnode, *jarray = NULL, *jentry = NULL, *jstring = NULL;
-	char buf[5];
+	json_object *jnode, *jarray = NULL, *jentry = NULL;
 
 	if (!cfg)
 		return false;
@@ -744,20 +739,12 @@ bool mesh_config_app_key_add(struct mesh_config *cfg, uint16_t net_idx,
 	if (!jentry)
 		return false;
 
-	snprintf(buf, 5, "%4.4x", app_idx);
-	jstring = json_object_new_string(buf);
-	if (!jstring)
+	if (!write_int(jentry, "index", app_idx))
 		goto fail;
 
-	json_object_object_add(jentry, "index", jstring);
-
-	snprintf(buf, 5, "%4.4x", net_idx);
-	jstring = json_object_new_string(buf);
-	if (!jstring)
+	if (!write_int(jentry, "boundNetKey", net_idx))
 		goto fail;
 
-	json_object_object_add(jentry, "boundNetKey", jstring);
-
 	if (!add_key_value(jentry, "key", key))
 		goto fail;
 
@@ -995,6 +982,7 @@ static struct mesh_config_pub *parse_model_publication(json_object *jpub)
 	case 32:
 		if (!str2hex(str, len, pub->virt_addr, 16))
 			goto fail;
+
 		pub->virt = true;
 		break;
 	default:
@@ -1468,19 +1456,6 @@ static bool write_uint32_hex(json_object *jobj, const char *desc, uint32_t val)
 	return true;
 }
 
-static bool write_int(json_object *jobj, const char *desc, int val)
-{
-	json_object *jvalue;
-
-	jvalue = json_object_new_int(val);
-	if (!jvalue)
-		return false;
-
-	json_object_object_del(jobj, desc);
-	json_object_object_add(jobj, desc, jvalue);
-	return true;
-}
-
 static const char *mode_to_string(int mode)
 {
 	switch (mode) {
@@ -1872,7 +1847,7 @@ bool mesh_config_model_pub_add(struct mesh_config *cfg, uint16_t ele_addr,
 	if (!res)
 		goto fail;
 
-	if (!write_uint16_hex(jpub, "index", pub->idx))
+	if (!write_int(jpub, "index", pub->idx))
 		goto fail;
 
 	if (!write_int(jpub, "ttl", pub->ttl))
@@ -1881,8 +1856,7 @@ bool mesh_config_model_pub_add(struct mesh_config *cfg, uint16_t ele_addr,
 	if (!write_int(jpub, "period", pub->period))
 		goto fail;
 
-	if (!write_int(jpub, "credentials",
-						pub->credential ? 1 : 0))
+	if (!write_int(jpub, "credentials", pub->credential ? 1 : 0))
 		goto fail;
 
 	jrtx = json_object_new_object();
