diff --git a/src/bin/pg_basebackup/pg_basebackup.c b/src/bin/pg_basebackup/pg_basebackup.c
index 238b671f7a..00b74118fb 100644
--- a/src/bin/pg_basebackup/pg_basebackup.c
+++ b/src/bin/pg_basebackup/pg_basebackup.c
@@ -41,6 +41,7 @@
 #include "receivelog.h"
 #include "replication/basebackup.h"
 #include "streamutil.h"
+#include "utils/jsonapi.h"
 
 #define ERRCODE_DATA_CORRUPTED	"XX001"
 
@@ -2019,10 +2020,40 @@ BaseBackup(void)
 		pg_log_info("base backup completed");
 }
 
+void
+jsonOFieldAction(void *state, char *fname, bool isnull)
+{
+	fprintf(stderr, "    FIELD \"%s\", null %d\n", fname, isnull); fflush(stderr);
+	pfree(fname);
+}
+
+void
+jsonScalarAction(void *state, char *token, JsonTokenType tokentype)
+{
+	fprintf(stderr, "    SCALAR TYPE %u: %s\n", tokentype, token); fflush(stderr);
+	pfree(token);
+}
 
 int
 main(int argc, char **argv)
 {
+	if (true)
+	{
+		char json[] = "{\"number\": 123, \"string\": \"val\\tue-丏\", \"bool\": true, \"null\": null}";
+		JsonSemAction sem = {.semstate = NULL, .scalar = jsonScalarAction, .object_field_start = jsonOFieldAction};
+		JsonLexContext *lex;
+
+		fprintf(stderr, "START\n"); fflush(stderr);
+
+		lex = makeJsonLexContextCstringLen(json, strlen(json), true);
+
+		pg_parse_json(lex, &sem);
+
+		fprintf(stderr, "END\n"); fflush(stderr);
+
+		exit(0);
+	}
+
 	static struct option long_options[] = {
 		{"help", no_argument, NULL, '?'},
 		{"version", no_argument, NULL, 'V'},