diff --git a/hostr/cmd/tools/getContentType.go b/hostr/cmd/tools/getContentType.go
new file mode 100644
index 0000000..b785ad0
--- /dev/null
+++ b/hostr/cmd/tools/getContentType.go
@@ -0,0 +1,20 @@
+package tools
+
+import (
+	"fmt"
+
+	"github.com/studiokaiji/nostr-webhost/hostr/cmd/consts"
+)
+
+func GetContentType(kind int) (string, error) {
+	switch kind {
+	case consts.KindWebhostHTML | consts.KindWebhostReplaceableHTML:
+		return "text/html; charset=utf-8", nil
+	case consts.KindWebhostCSS | consts.KindWebhostReplaceableCSS:
+		return "text/css; charset=utf-8", nil
+	case consts.KindWebhostJS | consts.KindWebhostReplaceableJS:
+		return "text/javascript; charset=utf-8", nil
+	default:
+		return "", fmt.Errorf("Invalid Kind")
+	}
+}