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diff --git a/upb/json/printer.h b/upb/json/printer.h
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+++ b/upb/json/printer.h
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+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2014 Google Inc.  See LICENSE for details.
+ * Author: Josh Haberman <jhaberman@gmail.com>
+ *
+ * upb::json::Printer allows you to create handlers that emit JSON
+ * according to a specific protobuf schema.
+ */
+
+#ifndef UPB_JSON_TYPED_PRINTER_H_
+#define UPB_JSON_TYPED_PRINTER_H_
+
+#include "upb/sink.h"
+
+#ifdef __cplusplus
+namespace upb {
+namespace json {
+class Printer;
+}  // namespace json
+}  // namespace upb
+#endif
+
+UPB_DECLARE_TYPE(upb::json::Printer, upb_json_printer);
+
+
+/* upb::json::Printer *********************************************************/
+
+// Prints an incoming stream of data to a BytesSink in JSON format.
+UPB_DEFINE_CLASS0(upb::json::Printer,
+ public:
+  Printer(const upb::Handlers* handlers);
+  ~Printer();
+
+  // Resets the state of the printer, so that it will expect to begin a new
+  // document.
+  void Reset();
+
+  // Resets the output pointer which will serve as our closure.  Implies
+  // Reset().
+  void ResetOutput(BytesSink* output);
+
+  // The input to the printer.
+  Sink* input();
+
+  // Returns handlers for printing according to the specified schema.
+  static reffed_ptr<const Handlers> NewHandlers(const upb::MessageDef* md);
+,
+UPB_DEFINE_STRUCT0(upb_json_printer,
+  upb_sink input_;
+  // Pointer to yajl_gen; void* here so we don't have to include YAJL headers.
+  void *yajl_gen_;
+  void *subc_;
+  upb_bytessink *output_;
+  // We track the depth so that we know when to emit startstr/endstr on the
+  // output.
+  int depth_;
+));
+
+UPB_BEGIN_EXTERN_C  // {
+
+// Native C API.
+
+void upb_json_printer_init(upb_json_printer *p, const upb_handlers *h);
+void upb_json_printer_uninit(upb_json_printer *p);
+void upb_json_printer_reset(upb_json_printer *p);
+void upb_json_printer_resetoutput(upb_json_printer *p, upb_bytessink *output);
+upb_sink *upb_json_printer_input(upb_json_printer *p);
+const upb_handlers *upb_json_printer_newhandlers(const upb_msgdef *md,
+                                                 const void *owner);
+
+UPB_END_EXTERN_C  // }
+
+#ifdef __cplusplus
+
+namespace upb {
+namespace json {
+inline Printer::Printer(const upb::Handlers* handlers) {
+  upb_json_printer_init(this, handlers);
+}
+inline Printer::~Printer() { upb_json_printer_uninit(this); }
+inline void Printer::Reset() { upb_json_printer_reset(this); }
+inline void Printer::ResetOutput(BytesSink* output) {
+  upb_json_printer_resetoutput(this, output);
+}
+inline Sink* Printer::input() { return upb_json_printer_input(this); }
+inline reffed_ptr<const Handlers> Printer::NewHandlers(
+    const upb::MessageDef *md) {
+  const Handlers* h = upb_json_printer_newhandlers(md, &h);
+  return reffed_ptr<const Handlers>(h, &h);
+}
+}  // namespace json
+}  // namespace upb
+
+#endif
+
+#endif  // UPB_JSON_TYPED_PRINTER_H_