diff --git a/config.go b/config.go
new file mode 100644
index 0000000..50414d4
--- /dev/null
+++ b/config.go
@@ -0,0 +1,33 @@
+package gfw
+
+import (
+	"encoding/json"
+	"os"
+)
+
+// Load builds a struct representation of the
+// configuration file located at @path
+// The structure checks for most format errors
+func Load(path string) (*controller, error) {
+
+	/* (1) Extract data
+	---------------------------------------------------------*/
+	/* (1) Open file */
+	var configFile, err = os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer configFile.Close()
+
+	/* (2) Init receiving dataset */
+	var receiver *controller
+
+	/* (3) Decode JSON */
+	decoder := json.NewDecoder(configFile)
+	err = decoder.Decode(receiver)
+	if err != nil {
+		return nil, err
+	}
+
+	return receiver, nil
+}
diff --git a/errors.go b/errors.go
new file mode 100644
index 0000000..cc7f903
--- /dev/null
+++ b/errors.go
@@ -0,0 +1,48 @@
+package gfw
+
+import (
+	"fmt"
+)
+
+type Err struct {
+	Code      int
+	Reason    string
+	Arguments []interface{}
+}
+
+var (
+	/* Base */
+	Success = &Err{0, "all right", nil}
+	Failure = &Err{1, "it failed", nil}
+	Unknown = &Err{-1, "", nil}
+
+	NoMatchFound  = &Err{2, "no resource found", nil}
+	AlreadyExists = &Err{3, "resource already exists", nil}
+
+	Config = &Err{4, "configuration error", nil}
+
+	/* I/O */
+	UploadError            = &Err{100, "upload failed", nil}
+	DownloadError          = &Err{101, "download failed", nil}
+	MissingDownloadHeaders = &Err{102, "download headers are missing", nil}
+	MissingDownloadBody    = &Err{103, "download body is missing", nil}
+
+	/* Controllers */
+	UnknownController    = &Err{200, "unknown controller", nil}
+	UnknownMethod        = &Err{201, "unknown method", nil}
+	UncallableController = &Err{202, "uncallable controller", nil}
+	UncallableMethod     = &Err{203, "uncallable method", nil}
+
+	/* Permissions */
+	Permission = &Err{300, "permission error", nil}
+	Token      = &Err{301, "token error", nil}
+
+	/* Check */
+	MissingParam        = &Err{400, "missing parameter", nil}
+	InvalidParam        = &Err{401, "invalid parameter", nil}
+	InvalidDefaultParam = &Err{402, "invalid default param", nil}
+)
+
+func (e Err) Error() string {
+	return fmt.Sprintf("[%d] %s", e.Code, e.Reason)
+}
diff --git a/types.go b/types.go
new file mode 100644
index 0000000..db5ce8b
--- /dev/null
+++ b/types.go
@@ -0,0 +1,27 @@
+package gfw
+
+/* (1) Configuration
+---------------------------------------------------------*/
+
+type methodParameter struct {
+	Description string       `json:"des"`
+	Type        string       `json:"typ"`
+	Rename      *string      `json:"ren"`
+	Optional    *bool        `json:"opt"`
+	Default     *interface{} `json:"def"`
+}
+type method struct {
+	Description string                      `json:"des"`
+	Permission  [][]string                  `json:"per"`
+	Parameters  *map[string]methodParameter `json:"par"`
+	Options     *map[string]interface{}     `json:"opt"`
+}
+
+type controller struct {
+	GET    *method `json:"GET"`
+	POST   *method `json:"POST"`
+	PUT    *method `json:"PUT"`
+	DELETE *method `json:"DELETE"`
+
+	Children map[string]controller `json:"/"`
+}