Parse in engine

internal/engine/engine.go

@@ -10,6 +10,8 @@ import (
 
 	"github.com/dop251/goja"
 	"github.com/goccy/go-yaml"
+
+	"github.com/antonmedv/fx/internal/jsonx"
 )
 
 //go:embed stdlib.js
@@ -74,7 +76,12 @@ func Reduce(args []string) {
 			os.Exit(1)
 		}
 	} else {
-
+		node, err := jsonx.Parse(data)
+		if err != nil {
+			println(err.Error())
+			os.Exit(1)
+		}
+		data = []byte(node.String())
 	}
 
 	var code strings.Builder

internal/jsonx/string.go

@@ -0,0 +1,30 @@
+package jsonx
+
+import (
+	"strings"
+)
+
+func (n *Node) String() string {
+	var out strings.Builder
+
+	it := n
+	for it != nil {
+		if it.Key != nil {
+			out.Write(it.Key)
+			out.WriteByte(':')
+		}
+		if it.Value != nil {
+			out.Write(it.Value)
+		}
+		if it.Comma {
+			out.WriteByte(',')
+		}
+		if it.IsCollapsed() {
+			it = it.Collapsed
+		} else {
+			it = it.Next
+		}
+	}
+
+	return out.String()
+}