diff --git a/api.go b/cmd/api.go
similarity index 75%
rename from api.go
rename to cmd/api.go
index 62ce483..c8d6df5 100644
--- a/api.go
+++ b/cmd/api.go
@@ -1,4 +1,4 @@
-package main
+package cmd
 
 import (
 	"encoding/json"
@@ -9,11 +9,29 @@ import (
 )
 
 // ----------------------------------------------
-// static globals
+// static var
 // ----------------------------------------------
+
 var DOMAIN = ".pamdas.org"
 var API_AUTH = "/oauth2/token"
 
+// ----------------------------------------------
+// stucts
+// ----------------------------------------------
+
+type Response struct {
+	AccessToken      string `json:"access_token"`
+	ExpiresIn        int    `json:"expires_in"`
+	TokenType        string `json:"token_type"`
+	Scope            string `json:"scope"`
+	RefreshToken     string `json:"refresh_token"`
+	ErrorDescription string `json:"error_description"`
+}
+
+// ----------------------------------------------
+// public funtions
+// ----------------------------------------------
+
 func authenticate(sitename, username, password string) (*Response, error) {
 	// Create a new HTTP client and make a POST request to the authentication endpoint
 	client := &http.Client{}
diff --git a/cmd/auth.go b/cmd/auth.go
new file mode 100644
index 0000000..78be616
--- /dev/null
+++ b/cmd/auth.go
@@ -0,0 +1,72 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// ----------------------------------------------
+// auth command
+// ----------------------------------------------
+
+var authCmd = &cobra.Command{
+	Use:   "auth",
+	Short: "Authentication with EarthRanger",
+	Long:  `Authenticate er with EarthRanger`,
+	Run: func(cmd *cobra.Command, args []string) {
+		auth()
+	},
+}
+
+// ----------------------------------------------
+// funtions
+// ----------------------------------------------
+
+func auth() {
+	fmt.Println("Enter sitename:")
+	var sitename string
+	_, err := fmt.Scan(&sitename)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Enter username:")
+	var username string
+	_, err = fmt.Scan(&username)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Enter password:")
+	var password string
+	_, err = fmt.Scan(&password)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	// Call the authenticate function to get the access token and expires in
+	response, err := authenticate(sitename, username, password)
+	if err != nil {
+		fmt.Println("Error authenticating:", err)
+		os.Exit(1)
+	}
+
+	// Print out the access token and expires in if the request was successful
+	if response != nil {
+		fmt.Printf("Access Token: %s\n", response.AccessToken)
+		fmt.Printf("Expires In: %d\n", response.ExpiresIn)
+	}
+}
+
+// ----------------------------------------------
+// initialize
+// ----------------------------------------------
+
+func init() {
+	rootCmd.AddCommand(authCmd)
+}
diff --git a/cmd/root.go b/cmd/root.go
new file mode 100644
index 0000000..032069c
--- /dev/null
+++ b/cmd/root.go
@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:     "er",
+	Short:   "EarthRanger CLI",
+	Long:    `Work with EarthRanger platform from command line`,
+	Version: "0.1.0",
+}
+
+func Execute() {
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func init() {
+	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}
diff --git a/go.mod b/go.mod
index d286bfc..cd55ce5 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,9 @@
 module github.com/doneill/er-cli-go
 
 go 1.21.4
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/cobra v1.8.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..d0e8c2c
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,10 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.8.0 h1:7aJaZx1B85qltLMc546zn58BxxfZdR/W22ej9CFoEf0=
+github.com/spf13/cobra v1.8.0/go.mod h1:WXLWApfZ71AjXPya3WOlMsY9yMs7YeiHhFVlvLyhcho=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/main.go b/main.go
index 0d8612b..5ca5ea0 100644
--- a/main.go
+++ b/main.go
@@ -1,55 +1,7 @@
 package main
 
-import (
-	"fmt"
-	"os"
-)
-
-type Response struct {
-	AccessToken      string `json:"access_token"`
-	ExpiresIn        int    `json:"expires_in"`
-	TokenType        string `json:"token_type"`
-	Scope            string `json:"scope"`
-	RefreshToken     string `json:"refresh_token"`
-	ErrorDescription string `json:"error_description"`
-}
+import "github.com/doneill/er-cli-go/cmd"
 
 func main() {
-	// Get the sitename, username, and password from CLI arguments
-	fmt.Println("Enter sitename:")
-	var sitename string
-	_, err := fmt.Scan(&sitename)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-
-	fmt.Println("Enter username:")
-	var username string
-	_, err = fmt.Scan(&username)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-
-	fmt.Println("Enter password:")
-	var password string
-	_, err = fmt.Scan(&password)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-
-	// Call the authenticate function to get the access token and expires in
-	response, err := authenticate(sitename, username, password)
-	if err != nil {
-		fmt.Println("Error authenticating:", err)
-		os.Exit(1)
-	}
-
-	// Print out the access token and expires in if the request was successful
-	if response != nil {
-		fmt.Printf("Access Token: %s\n", response.AccessToken)
-		fmt.Printf("Expires In: %d\n", response.ExpiresIn)
-	}
+	cmd.Execute()
 }