diff --git a/contrib/json_spirit/json_spirit_writer.h b/contrib/json_spirit/json_spirit_writer.h
new file mode 100644
index 0000000..b79b068
--- /dev/null
+++ b/contrib/json_spirit/json_spirit_writer.h
@@ -0,0 +1,63 @@
+#ifndef JSON_SPIRIT_WRITER
+#define JSON_SPIRIT_WRITER
+
+//          Copyright John W. Wilkinson 2007 - 2011
+// Distributed under the MIT License, see accompanying file LICENSE.txt
+
+// json spirit version 4.05
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include "json_spirit_value.h"
+#include "json_spirit_writer_options.h"
+#include <iostream>
+
+namespace json_spirit
+{
+    // these functions to convert JSON Values to text
+
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    void         write( const Value&  value, std::ostream&  os, unsigned int options = 0 );
+    std::string  write( const Value&  value, unsigned int options = 0 );
+#endif
+
+#ifdef JSON_SPIRIT_MVALUE_ENABLED
+    void         write( const mValue& value, std::ostream&  os, unsigned int options = 0 );
+    std::string  write( const mValue& value, unsigned int options = 0 );
+#endif
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write( const wValue&  value, std::wostream& os, unsigned int options = 0 );
+    std::wstring write( const wValue&  value, unsigned int options = 0 );
+#endif
+
+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write( const wmValue& value, std::wostream& os, unsigned int options = 0 );
+    std::wstring write( const wmValue& value, unsigned int options = 0 );
+#endif
+
+    // these "formatted" versions of the "write" functions are the equivalent of the above functions
+    // with option "pretty_print"
+    
+#ifdef JSON_SPIRIT_VALUE_ENABLED
+    void         write_formatted( const Value& value, std::ostream&  os );
+    std::string  write_formatted( const Value& value );
+#endif
+#ifdef JSON_SPIRIT_MVALUE_ENABLED
+    void         write_formatted( const mValue& value, std::ostream&  os );
+    std::string  write_formatted( const mValue& value );
+#endif
+
+#if defined( JSON_SPIRIT_WVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write_formatted( const wValue& value, std::wostream& os );
+    std::wstring write_formatted( const wValue& value );
+#endif
+#if defined( JSON_SPIRIT_WMVALUE_ENABLED ) && !defined( BOOST_NO_STD_WSTRING )
+    void         write_formatted( const wmValue& value, std::wostream& os );
+    std::wstring write_formatted( const wmValue& value );
+#endif
+}
+
+#endif