diff --git a/pbf/index.js b/pbf/index.js
index 2e724e2..99d7417 100644
--- a/pbf/index.js
+++ b/pbf/index.js
@@ -1,3 +1,4 @@
+const fs = require('fs');
 const debug=require('debug')('pbf');
 const gtfsRt=require('../../proto2js/js/gtfs-rt.js');
 const Pbf = require('pbf');
@@ -10,12 +11,22 @@ run().catch(err => {
 async function run() {
     debug('run started...');
     const FeedMessage = gtfsRt.FeedMessage;
-    const buffer=[];
-    // read
-    debug('create pbf');
-    const pbf = new Pbf(buffer);
-    debug('create obj');
-    const obj = FeedMessage.read(pbf);
-    debug('use obj');
+    debug('read gtfs-rt feed from file');
+    const buffer=fs.readFileSync('/tmp/gtfsr_connect.bin');
+    if(buffer instanceof Buffer){
+	debug('buffer is instance of Buffer');
+	debug('read buffer and create pbf');
+	const pbf = new Pbf(buffer);
+	debug('create obj');
+	const obj = FeedMessage.read(pbf);
+	debug('use obj');
+	if(obj.header in obj){
+	    debug('obj has header');
+	}else{
+	    debug('obj has header NOT');
+	}
+    }else{
+	debug('buffer is NOT instance of Buffer');
+    }
     debug('run done.');
 }
diff --git a/pbf/package.json b/pbf/package.json
index 0892f5a..61d95b3 100644
--- a/pbf/package.json
+++ b/pbf/package.json
@@ -14,6 +14,7 @@
         "nodemon": "^2.0.7"
     },
     "dependencies": {
+        "fs": "^0.0.1-security",
         "pbf": "^3.2.1"
     }
 }