diff --git a/src/io/json.cpp b/src/io/json.cpp
index 6d62b91..29c75ad 100644
--- a/src/io/json.cpp
+++ b/src/io/json.cpp
@@ -119,9 +119,12 @@ namespace fc
                   in.get();
                   return token.str();
                default:
-                  std::cerr<<c;
+                if( isalnum( c ) )
+                {
                   token << c;
                   in.get();
+                }
+                else return token.str();
             }
          }
          return token.str();
@@ -265,7 +268,8 @@ namespace fc
    template<typename T>
    variant token_from_stream( T& in )
    {
-      fc::stringstream ss;
+      std::stringstream ss;
+      ss.exceptions( std::ifstream::badbit );
       bool parsed_unexpected_character = false;
       bool received_eof = false;
       try
diff --git a/src/io/sstream.cpp b/src/io/sstream.cpp
index 1534f08..28a5aac 100644
--- a/src/io/sstream.cpp
+++ b/src/io/sstream.cpp
@@ -9,11 +9,13 @@ namespace fc {
     public:
     impl( fc::string&s )
     :ss( s )
-    { }
+    { ss.exceptions( std::stringstream::badbit | std::stringstream::eofbit ); }
+
     impl( const fc::string&s )
     :ss( s )
-    { }
-    impl(){}
+    { ss.exceptions( std::stringstream::badbit | std::stringstream::eofbit ); }
+
+    impl(){ss.exceptions( std::stringstream::badbit | std::stringstream::eofbit ); }
     
     std::stringstream ss;
   };