diff --git a/lib/dev.js b/lib/dev.js
index abf1385..977d85f 100644
--- a/lib/dev.js
+++ b/lib/dev.js
@@ -202,6 +202,8 @@ export default async function createServer(root = '', conf = {}) {
 
             break
 
+          case 'webmanifest':
+          case 'json':
           case 'png':
           case 'jpg':
           case 'jpeg':
diff --git a/lib/mime-tpyes.js b/lib/mime-tpyes.js
index 8ff86aa..233cc75 100644
--- a/lib/mime-tpyes.js
+++ b/lib/mime-tpyes.js
@@ -14,6 +14,7 @@ const MIME_TYPES = {
   bmp: 'image/x-ms-bmp',
   js: 'application/javascript;charset=utf-8',
   json: 'application/json;charset=utf-8',
+  webmanifest: 'application/json;charset=utf-8',
   mp3: 'audio/mpeg',
   ogg: 'audio/ogg',
   m4a: 'audio/x-m4a',