diff --git a/src/mime.cr b/src/mime.cr
index 9a369cde2f6b..1552b0752c2e 100644
--- a/src/mime.cr
+++ b/src/mime.cr
@@ -89,6 +89,7 @@ module MIME
     ".jpg"  => "image/jpeg",
     ".jpeg" => "image/jpeg",
     ".js"   => "application/javascript; charset=utf-8",
+    ".json" => "application/json",
     ".pdf"  => "application/pdf",
     ".png"  => "image/png",
     ".svg"  => "image/svg+xml",