diff --git a/.example/other/test.go b/.example/other/test.go
index bf92aac69..fe4220413 100644
--- a/.example/other/test.go
+++ b/.example/other/test.go
@@ -1,13 +1,7 @@
 package main
 
-import "fmt"
-
 func main() {
 	for i := 0; i < 10; i++ {
-		fmt.Println(i)
-		switch i {
-		case 5:
-			break
-		}
+
 	}
 }
diff --git a/encoding/gjson/gjson_api.go b/encoding/gjson/gjson_api.go
index f50fbda44..5c36c1eec 100644
--- a/encoding/gjson/gjson_api.go
+++ b/encoding/gjson/gjson_api.go
@@ -43,8 +43,14 @@ func (j *Json) Get(pattern string, def ...interface{}) interface{} {
 	j.mu.RLock()
 	defer j.mu.RUnlock()
 
+	// It returns nil if pattern is empty.
+	if pattern == "" {
+		return nil
+	}
+
+	// It returns all if pattern is ".".
 	if pattern == "." {
-		pattern = ""
+		return *j.p
 	}
 
 	var result *interface{}
diff --git a/encoding/gjson/gjson_z_unit_basic_test.go b/encoding/gjson/gjson_z_unit_basic_test.go
index 071fbb3ae..bdcc5c847 100644
--- a/encoding/gjson/gjson_z_unit_basic_test.go
+++ b/encoding/gjson/gjson_z_unit_basic_test.go
@@ -371,10 +371,11 @@ func Test_Basic(t *testing.T) {
 	gtest.Case(t, func() {
 		j := gjson.New(`{"name":"gf","time":"2019-06-12"}`)
 		j.SetViolenceCheck(true)
-		gtest.Assert(j.Get("").(g.Map)["name"], "gf")
-		gtest.Assert(j.Get("").(g.Map)["name1"], nil)
+		gtest.Assert(j.Get(""), nil)
+		gtest.Assert(j.Get(".").(g.Map)["name"], "gf")
+		gtest.Assert(j.Get(".").(g.Map)["name1"], nil)
 		j.SetViolenceCheck(false)
-		gtest.Assert(j.Get("").(g.Map)["name"], "gf")
+		gtest.Assert(j.Get(".").(g.Map)["name"], "gf")
 
 		err := j.Set("name", "gf1")
 		gtest.Assert(err, nil)
diff --git a/os/gcfg/gcfg.go b/os/gcfg/gcfg.go
index a682ff9cc..f59338842 100644
--- a/os/gcfg/gcfg.go
+++ b/os/gcfg/gcfg.go
@@ -246,8 +246,9 @@ func (c *Config) FilePath(file ...string) (path string) {
 }
 
 // SetFileName sets the default configuration file name.
-func (c *Config) SetFileName(name string) {
+func (c *Config) SetFileName(name string) *Config {
 	c.name.Set(name)
+	return c
 }
 
 // GetFileName returns the default configuration file name.
diff --git a/os/gcfg/gcfg_api.go b/os/gcfg/gcfg_api.go
index 95633dfec..81d61f1c8 100644
--- a/os/gcfg/gcfg_api.go
+++ b/os/gcfg/gcfg_api.go
@@ -230,56 +230,56 @@ func (c *Config) GetStruct(pattern string, pointer interface{}, mapping ...map[s
 	if j := c.getJson(); j != nil {
 		return j.GetStruct(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetStructDeep(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetStructDeep(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetStructs(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetStructs(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetStructsDeep(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetStructsDeep(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetMapStruct(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetMapStruct(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetMapStructDeep(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetMapStructDeep(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetMapStructs(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetMapStructs(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 func (c *Config) GetMapStructsDeep(pattern string, pointer interface{}, mapping ...map[string]string) error {
 	if j := c.getJson(); j != nil {
 		return j.GetMapStructsDeep(pattern, pointer, mapping...)
 	}
-	return errors.New("config file not found")
+	return errors.New("configuration not found")
 }
 
 // Deprecated.
@@ -287,10 +287,74 @@ func (c *Config) GetToStruct(pattern string, pointer interface{}) error {
 	return c.GetStruct(pattern, pointer)
 }
 
-// Reload is alias of Clear.
-// Deprecated.
-func (c *Config) Reload() {
-	c.jsons.Clear()
+func (c *Config) ToMap() map[string]interface{} {
+	if j := c.getJson(); j != nil {
+		return j.ToMap()
+	}
+	return nil
+}
+
+func (c *Config) ToArray() []interface{} {
+	if j := c.getJson(); j != nil {
+		return j.ToArray()
+	}
+	return nil
+}
+
+func (c *Config) ToStruct(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToStruct(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToStructDeep(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToStructDeep(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToStructs(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToStructs(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToStructsDeep(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToStructsDeep(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToMapStruct(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToMapStruct(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToMapStructDeep(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToMapStructDeep(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToMapStructs(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToMapStructs(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
+}
+
+func (c *Config) ToMapStructsDeep(pointer interface{}, mapping ...map[string]string) error {
+	if j := c.getJson(); j != nil {
+		return j.ToMapStructsDeep(pointer, mapping...)
+	}
+	return errors.New("configuration not found")
 }
 
 // Clear removes all parsed configuration files content cache,
@@ -298,3 +362,10 @@ func (c *Config) Reload() {
 func (c *Config) Clear() {
 	c.jsons.Clear()
 }
+
+// Dump prints current Json object with more manually readable.
+func (c *Config) Dump() {
+	if j := c.getJson(); j != nil {
+		j.Dump()
+	}
+}
diff --git a/os/gcfg/gcfg_z_unit_test.go b/os/gcfg/gcfg_z_unit_test.go
index 01012b3ea..69cf5c1e1 100644
--- a/os/gcfg/gcfg_z_unit_test.go
+++ b/os/gcfg/gcfg_z_unit_test.go
@@ -401,7 +401,6 @@ func TestCfg_Get(t *testing.T) {
 		}{}
 		gtest.Assert(c.GetToStruct("name", &name) == nil, false)
 
-		c.Reload()
 		c.Clear()
 
 		arr, _ := gjson.Encode(g.Map{"name": "gf", "time": "2019-06-12", "person": g.Map{"name": "gf"}, "floats": g.Slice{1, 2, 3}})