diff --git a/lib/util.js b/lib/util.js
index 32de6ef..c25bde8 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -9,7 +9,7 @@ function getFilesFromDisk(subdir) {
     var filesOnDisk = [];
 
     // Only iterate through supported .js, .gs and .html files in dir
-    dir.readFiles(subdir, { match: /.js$|.gs$|.html$/ },
+    dir.readFiles(subdir, { match: /.js$|.gs$|.json$|.html$/ },
       // Invoke this callback on each file
       function(err, content, filename, next) {
         if (err) return reject(err);
@@ -50,12 +50,14 @@ function hasFileOnDisk(filesOnDisk, file) {
 function getFileType(file) {
   if (file.ext === '.js') return 'server_js';
   if (file.ext === '.gs') return 'server_js';
+  if (file.ext === '.json') return 'json';
   if (file.ext === '.html') return 'html';
   throw new Error('Unsupported file type found. Google Apps Script only allows .js and .html');
 }
 
 function getFileExtension(file) {
   if (file.type === 'server_js') return '.js';
+  if (file.type === 'json') return '.json';
   if (file.type === 'html') return '.html';
   throw new Error('Unsupported file type found');
 }