diff --git a/diff.go b/diff.go
index 6dadac1..00d76ea 100644
--- a/diff.go
+++ b/diff.go
@@ -30,3 +30,34 @@ func Diff(old, new []int64) (added, removed []int64) {
 
 	return added, removed
 }
+
+// DiffString ...
+func DiffString(old, new []string) (added, removed []string) {
+	for i := range old {
+		isRemoved := true
+		for j := range new {
+			if old[i] == new[j] {
+				isRemoved = false
+				break
+			}
+		}
+		if isRemoved {
+			removed = append(removed, old[i])
+		}
+	}
+
+	for i := range new {
+		isAdded := true
+		for j := range old {
+			if new[i] == old[j] {
+				isAdded = false
+				break
+			}
+		}
+		if isAdded {
+			added = append(added, new[i])
+		}
+	}
+
+	return added, removed
+}
diff --git a/http.go b/http.go
index af16056..7e04a44 100644
--- a/http.go
+++ b/http.go
@@ -1,12 +1,10 @@
 package webutility
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
-	"net/url"
 )
 
 // StatusRecorder ...
@@ -158,71 +156,3 @@ func InternalServerError(w http.ResponseWriter, r *http.Request, err string) {
 func DecodeJSON(r io.Reader, v interface{}) error {
 	return json.NewDecoder(r).Decode(v)
 }
-
-func GetJSON(url string, v interface{}, params url.Values, headers http.Header) (status int, err error) {
-	p := params.Encode()
-	if p != "" {
-		url += "?" + p
-	}
-
-	req, err := http.NewRequest(http.MethodGet, url, nil)
-	if err != nil {
-		return 0, err
-	}
-
-	if headers != nil {
-		for k, head := range headers {
-			for i, h := range head {
-				if i == 0 {
-					req.Header.Set(k, h)
-				} else {
-					req.Header.Add(k, h)
-				}
-			}
-		}
-	}
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return 0, err
-	}
-	status = resp.StatusCode
-
-	return status, DecodeJSON(resp.Body, v)
-}
-
-func PostJSON(url string, v, r interface{}, params url.Values, headers http.Header) (status int, err error) {
-	buffer := bytes.NewBuffer(make([]byte, 0))
-	json.NewEncoder(buffer).Encode(v)
-
-	p := params.Encode()
-	if p != "" {
-		url += "?" + p
-	}
-
-	req, err := http.NewRequest(http.MethodPost, url, buffer)
-	if err != nil {
-		return 0, err
-	}
-
-	if headers != nil {
-		for k, head := range headers {
-			for i, h := range head {
-				if i == 0 {
-					req.Header.Set(k, h)
-				} else {
-					req.Header.Add(k, h)
-				}
-			}
-		}
-	}
-	req.Header.Set("Content-Type", "application/json")
-
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return 0, err
-	}
-	status = resp.StatusCode
-
-	return status, DecodeJSON(resp.Body, r)
-}
diff --git a/json.go b/json.go
new file mode 100644
index 0000000..4e51ab1
--- /dev/null
+++ b/json.go
@@ -0,0 +1,76 @@
+package webutility
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/url"
+)
+
+func GetJSON(url string, v interface{}, params url.Values, headers http.Header) (status int, err error) {
+	p := params.Encode()
+	if p != "" {
+		url += "?" + p
+	}
+
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return 0, err
+	}
+
+	if headers != nil {
+		for k, head := range headers {
+			for i, h := range head {
+				if i == 0 {
+					req.Header.Set(k, h)
+				} else {
+					req.Header.Add(k, h)
+				}
+			}
+		}
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return 0, err
+	}
+	status = resp.StatusCode
+
+	return status, DecodeJSON(resp.Body, v)
+}
+
+func PostJSON(url string, v, r interface{}, params url.Values, headers http.Header) (status int, err error) {
+	buffer := bytes.NewBuffer(make([]byte, 0))
+	json.NewEncoder(buffer).Encode(v)
+
+	p := params.Encode()
+	if p != "" {
+		url += "?" + p
+	}
+
+	req, err := http.NewRequest(http.MethodPost, url, buffer)
+	if err != nil {
+		return 0, err
+	}
+
+	if headers != nil {
+		for k, head := range headers {
+			for i, h := range head {
+				if i == 0 {
+					req.Header.Set(k, h)
+				} else {
+					req.Header.Add(k, h)
+				}
+			}
+		}
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return 0, err
+	}
+	status = resp.StatusCode
+
+	return status, DecodeJSON(resp.Body, r)
+}