diff --git a/src/cocoatweet/util/util.cc b/src/cocoatweet/util/util.cc
new file mode 100644
index 0000000..40a0626
--- /dev/null
+++ b/src/cocoatweet/util/util.cc
@@ -0,0 +1,21 @@
+#include "cocoatweet/util/util.h"
+#include <cctype>
+
+namespace CocoaTweet::Util{
+	std::string urlEncode(const std::string& _str){
+		std::stringstream out;
+
+		for(const auto c : _str){
+			if(std::isalpha(c) || std::isdigit(c) || (c == '.' || (c == '_') || (c == '-' || (c == '~')))){
+				out << c;
+			}else{
+				out << '%' << std::hex << std::uppercase << static_cast<int>(c);
+			}
+		}
+
+		return out.str();
+	}
+
+	template<typename T>
+	std::string join(const std::vector<T> _vec){}
+}
diff --git a/src/cocoatweet/util/util.h b/src/cocoatweet/util/util.h
new file mode 100644
index 0000000..d39e28f
--- /dev/null
+++ b/src/cocoatweet/util/util.h
@@ -0,0 +1,14 @@
+#ifndef COCOATWEET_UTIL_UTIL_H_
+#define COCOATWEET_UTIL_UTIL_H_
+
+#include <vector>
+#include <string>
+#include <sstream>
+
+namespace CocoaTweet::Util{
+	std::string urlEncode(const std::string& _str);
+	template<typename T>
+	std::string join(const std::vector<T> _vec);
+}
+
+#endif