diff --git a/.gitignore b/.gitignore
index adf8f72..de7a4ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,3 +21,4 @@
 # Go workspace file
 go.work
 
+json2nats
diff --git a/default.json b/default.json
new file mode 100644
index 0000000..f9e452a
--- /dev/null
+++ b/default.json
@@ -0,0 +1,24 @@
+{
+    "src": "ZDMS.demo",
+    "topic": "topic.demo",
+    "content": {
+        "areas": [3, 5, 6, 8, 9],
+        "current": 3,
+        "local": 1,
+        "total": 39,
+        "printer": 1,
+        "card": 0,
+        "bus-op": 2,
+        "other": 0,
+        "details": [
+            {
+                "type": "10L水炮",
+                "count": 3
+            },
+            {
+                "type": "20L水炮",
+                "count": 3
+            }
+        ]
+    }
+}
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..b6ffed3
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module json2nats
+
+go 1.21.3
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..1d1eed2
--- /dev/null
+++ b/main.go
@@ -0,0 +1,53 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+func main() {
+	var fi, fo string
+	flag.Usage = func() {
+		fmt.Println("json2nats version v0.1")
+		flag.PrintDefaults()
+	}
+	flag.StringVar(&fi, "i", "default.json", "Json file name")
+	flag.StringVar(&fo, "o", "", "Output file name")
+	flag.Parse()
+
+	b, err := os.ReadFile(fi)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("[OK] Read json file:", fi)
+
+	var stri, stro string
+	stri = string(b)
+	for i := range stri {
+		switch stri[i] {
+		case ' ':
+		case '\n':
+		case '\r':
+			// do nothing.
+		case '"':
+			stro += `\"`
+		case ',':
+			stro += `, `
+		default:
+			stro += string(stri[i])
+		}
+	}
+
+	fmt.Println("[OK] Make nats tool string:")
+
+	if fo != "" {
+		err = os.WriteFile(fo, []byte(stro), 0644)
+		if err != nil {
+			panic(err)
+		}
+		fmt.Println("[OK] Write to:", fo)
+	}
+
+	fmt.Println(stro)
+}