diff --git a/include/ndn-cpp/data.hpp b/include/ndn-cpp/data.hpp
index 3f0d00b..d25253f 100644
--- a/include/ndn-cpp/data.hpp
+++ b/include/ndn-cpp/data.hpp
@@ -273,6 +273,9 @@
   wire_ = Block();
 }
 
+std::ostream&
+operator << (std::ostream &os, const Data &data);
+
 } // namespace ndn
 
 #endif
diff --git a/include/ndn-cpp/meta-info.hpp b/include/ndn-cpp/meta-info.hpp
index 27e97e8..3a33dc4 100644
--- a/include/ndn-cpp/meta-info.hpp
+++ b/include/ndn-cpp/meta-info.hpp
@@ -111,6 +111,19 @@
     }
 }
 
+inline std::ostream&
+operator << (std::ostream &os, const MetaInfo &info)
+{
+  // ContentType
+  os << "ContentType: " << info.getType();
+
+  // FreshnessPeriod
+  if (info.getFreshnessPeriod() >= 0) {
+    os << ", FreshnessPeriod: " << info.getFreshnessPeriod();
+  }
+  return os;
+}
+
 } // namespace ndn
 
 #endif // NDN_META_INFO_HPP
diff --git a/src/data.cpp b/src/data.cpp
index 4326040..6b1efd7 100644
--- a/src/data.cpp
+++ b/src/data.cpp
@@ -77,5 +77,18 @@
   signature_.setValue(wire_.get(Tlv::SignatureValue));
 }
 
+std::ostream&
+operator << (std::ostream &os, const Data &data)
+{
+  os << "Name: " << data.getName() << "\n";
+  os << "MetaInfo: " << data.getMetaInfo() << "\n";
+  os << "Content: (size: " << data.getContent().value_size() << ")\n";
+  os << "Signature: (type: " << data.getSignature().getType() <<
+    ", value_length: "<< data.getSignature().getValue().value_size() << ")";
+  os << std::endl;
+
+  return os;
+}
+
 
 }