diff --git a/pkg/yaml2json/template.go b/pkg/yaml2json/convertor.go
similarity index 72%
rename from pkg/yaml2json/template.go
rename to pkg/yaml2json/convertor.go
index 3e4dc41..aa66fb2 100644
--- a/pkg/yaml2json/template.go
+++ b/pkg/yaml2json/convertor.go
@@ -2,15 +2,14 @@ package yaml2json
 
 import (
 	"github.com/goccy/go-yaml"
-	"github.com/tokopedia/gripmock/pkg/template"
 )
 
 type Convertor struct {
-	engine *template.Engine
+	engine *engine
 }
 
 func New() *Convertor {
-	return &Convertor{engine: template.New()}
+	return &Convertor{engine: &engine{}}
 }
 
 func (t *Convertor) Execute(name string, data []byte) ([]byte, error) {
diff --git a/pkg/yaml2json/convertor_test.go b/pkg/yaml2json/convertor_test.go
new file mode 100644
index 0000000..9658181
--- /dev/null
+++ b/pkg/yaml2json/convertor_test.go
@@ -0,0 +1,26 @@
+package yaml2json_test
+
+import (
+	"github.com/stretchr/testify/require"
+	"github.com/tokopedia/gripmock/pkg/yaml2json"
+	"testing"
+)
+
+func TestConvertor(t *testing.T) {
+	convertor := yaml2json.New()
+
+	bytes, err := convertor.Execute("hello", []byte(`
+yaml2json:
+  base64: {{ uuidToBase64StdEncoding "77465064-a0ce-48a3-b7e4-d50f88e55093" }}
+  highLow: {{ uuidToHighLowLittleEndian "e351220b-4847-42f5-8abb-c052b87ff2d4" }}
+`))
+
+	expected := `{
+  "yaml2json": {
+    "base64": "d0ZQZKDOSKO35NUPiOVQkw==",
+    "highLow": {"high":-773977811204288029,"low":-3102276763665777782}
+  }
+}`
+	require.NoError(t, err)
+	require.JSONEq(t, expected, string(bytes))
+}
diff --git a/pkg/template/engine.go b/pkg/yaml2json/engine.go
similarity index 77%
rename from pkg/template/engine.go
rename to pkg/yaml2json/engine.go
index c334664..6624955 100644
--- a/pkg/template/engine.go
+++ b/pkg/yaml2json/engine.go
@@ -1,4 +1,4 @@
-package template
+package yaml2json
 
 import (
 	"bytes"
@@ -9,13 +9,9 @@ import (
 	"github.com/google/uuid"
 )
 
-type Engine struct{}
+type engine struct{}
 
-func New() *Engine {
-	return &Engine{}
-}
-
-func (e *Engine) Execute(name string, data []byte) ([]byte, error) {
+func (e *engine) Execute(name string, data []byte) ([]byte, error) {
 	var buffer bytes.Buffer
 
 	parse, err := template.New(name).Funcs(e.funcMap()).Parse(string(data))
@@ -30,10 +26,12 @@ func (e *Engine) Execute(name string, data []byte) ([]byte, error) {
 	return buffer.Bytes(), nil
 }
 
-func (e *Engine) funcMap() template.FuncMap {
+func (e *engine) funcMap() template.FuncMap {
 	return template.FuncMap{
-		"base64StdEncoding": func(str string) string {
-			return base64.StdEncoding.EncodeToString([]byte(str))
+		"uuidToBase64StdEncoding": func(guid string) string {
+			v := uuid.MustParse(guid)
+
+			return base64.StdEncoding.EncodeToString(v[:])
 		},
 		"uuidToHighLowLittleEndian": func(guid string) string {
 			v := uuid.MustParse(guid)