diff --git a/src/cocoatweet/oauth/key.cc b/src/cocoatweet/oauth/key.cc
new file mode 100644
index 0000000..f6e9333
--- /dev/null
+++ b/src/cocoatweet/oauth/key.cc
@@ -0,0 +1,15 @@
+#include "cocoatweet/oauth/key.h"
+#include "nlohmann/json.hpp"
+#include <fstream>
+#include <string>
+
+namespace CocoaTweet::OAuth{
+Key Key::fromJsonFile(const std::string _jsonFile){
+		
+		  std::ifstream ifs(_jsonFile);
+			  std::string str((std::istreambuf_iterator<char>(ifs)), std::istreambuf_iterator<char>());
+
+		 auto j =  nlohmann::json::parse(str);
+		 return Key(j["consumer_key"], j["consumer_secret"], j["access_token"], j["access_token_secret"]);
+}
+}
diff --git a/src/cocoatweet/oauth/key.h b/src/cocoatweet/oauth/key.h
index 536dce8..425ba0b 100644
--- a/src/cocoatweet/oauth/key.h
+++ b/src/cocoatweet/oauth/key.h
@@ -2,6 +2,7 @@
 #define COCOATWEET_OAUTH_KEY_H_
 
 #include <map>
+
 namespace CocoaTweet::OAuth {
 class Key {
   const std::string consumerKey_;
@@ -37,6 +38,8 @@ public:
     return std::map<std::string, std::string>{{"oauth_consumer_key", consumerSecret_},
                                               {"oauth_token", accessTokenSecret_}};
   }
+
+	static Key fromJsonFile(const std::string _jsonFile);
 };
 } // namespace CocoaTweet::OAuth