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diff --git a/src/devtools/main-exprefs.c b/src/devtools/main-exprefs.c
new file mode 100644
index 00000000..5a114a2a
--- /dev/null
+++ b/src/devtools/main-exprefs.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2016, 2017, 2018 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": { "$ref": "#/type/a" }
+ *    }
+ *  }
+ *
+ * will be exapanded to
+ *
+ *  {
+ *    "type":{
+ *      "a": "int",
+ *      "b": "int"
+ *    }
+ *  }
+ *
+ * Invocation:   program  [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <json-c/json.h>
+
+#include "exprefs.h"
+
+/**
+ * process a file and prints its expansion on stdout
+ */
+void process(char *filename)
+{
+	struct json_object *root;
+
+	/* translate - */
+	if (!strcmp(filename, "-"))
+		filename = "/dev/stdin";
+
+	/* check access */
+	if (access(filename, R_OK)) {
+		fprintf(stderr, "can't access file %s\n", filename);
+		exit(1);
+	}
+
+	/* read the file */
+	root = json_object_from_file(filename);
+	if (!root) {
+		fprintf(stderr, "reading file %s produced null\n", filename);
+		exit(1);
+	}
+
+	/* expand */
+	root = exp$refs(root);
+
+	/* check if tree */
+	if (!exp$refs_is_tree(root)) {
+		fprintf(stderr, "expansion of %s doesn't produce a tree\n", filename);
+		exit(1);
+	}
+
+	/* print the result */
+	json_object_to_file_ext ("/dev/stdout", root, JSON_C_TO_STRING_PRETTY);
+
+	/* clean up */
+	json_object_put(root);
+}
+
+/** process the list of files or stdin if none */
+int main(int ac, char **av)
+{
+	if (!*++av)
+		process("-");
+	else {
+		do { process(*av); } while(*++av);
+	}
+	return 0;
+}
+