diff --git a/app/test-uv.js b/app/test-uv.js
index 370fd8d..f56f864 100644
--- a/app/test-uv.js
+++ b/app/test-uv.js
@@ -6,6 +6,11 @@ p(uv.Timer.prototype);
 print("Handle.prototype (via Timer.prototype)");
 p(Object.getPrototypeOf(uv.Timer.prototype));
 
+print("\nPrepare.prototype");
+p(uv.Prepare.prototype);
+print("Handle.prototype (via Prepare.prototype)");
+p(Object.getPrototypeOf(uv.Prepare.prototype));
+
 print("\nTcp.prototype");
 p(uv.Tcp.prototype);
 print("Stream.prototype (via Tcp.prototype)");
@@ -21,6 +26,12 @@ uv.walk(p);
 timer.close();
 tcp.close();
 
+var prepare = new uv.Prepare();
+prepare.start(function () {
+  print("prepare...");
+});
+prepare.unref();
+
 print("\nTesting simple timeout");
 var timer = new uv.Timer();
 timer.start(100, 0, function () {
diff --git a/implementations/duktape/duv/callbacks.c b/implementations/duktape/duv/callbacks.c
index 2463448..dbeb4b3 100644
--- a/implementations/duktape/duv/callbacks.c
+++ b/implementations/duktape/duv/callbacks.c
@@ -19,6 +19,10 @@ void duv_on_timeout(uv_timer_t *timer) {
   duv_call_callback((uv_handle_t*)timer, "\xffon-timeout", 0);
 }
 
+void duv_on_prepare(uv_prepare_t *prepare) {
+  duv_call_callback((uv_handle_t*)prepare, "\xffon-prepare", 0);
+}
+
 void duv_on_read(uv_stream_t* stream, ssize_t nread, const uv_buf_t* buf) {
   duk_context *ctx = stream->data;
   if (nread >= 0) {
diff --git a/implementations/duktape/duv/callbacks.h b/implementations/duktape/duv/callbacks.h
index 369109a..5134744 100644
--- a/implementations/duktape/duv/callbacks.h
+++ b/implementations/duktape/duv/callbacks.h
@@ -10,6 +10,9 @@ void duv_on_alloc(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf);
 // Timer method callbacks
 void duv_on_timeout(uv_timer_t *timer);
 
+// Prepare method callbacks
+void duv_on_prepare(uv_prepare_t *prepare);
+
 // Stream method callbacks
 void duv_on_read(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf);
 void duv_on_write(uv_write_t *shutdown, int status);
diff --git a/implementations/duktape/duv/duv.c b/implementations/duktape/duv/duv.c
index bba4ecb..f4c6de0 100644
--- a/implementations/duktape/duv/duv.c
+++ b/implementations/duktape/duv/duv.c
@@ -3,6 +3,7 @@
 #include "loop.h"
 #include "handle.h"
 #include "timer.h"
+#include "prepare.h"
 #include "stream.h"
 #include "tcp.h"
 
@@ -27,6 +28,12 @@ static const duk_function_list_entry duv_timer_methods[] = {
   {0,0,0}
 };
 
+static const duk_function_list_entry duv_prepare_methods[] = {
+  {"start", duv_prepare_start, 1},
+  {"stop", duv_prepare_stop, 0},
+  {0,0,0}
+};
+
 static const duk_function_list_entry duv_stream_methods[] = {
   {"shutdown", duv_shutdown, 1},
   {"listen", duv_listen, 2},
@@ -62,6 +69,7 @@ static const duk_function_list_entry duv_funcs[] = {
 
   // libuv handle constructors
   {"Timer", duv_timer, 0},
+  {"Prepare", duv_prepare, 0},
   {"Tcp", duv_tcp, 0},
 
   // // pipe.c
@@ -166,6 +174,17 @@ duk_ret_t duv_push_module(duk_context *ctx) {
 
   // stack: nucleus uv Handle.prototype
 
+  // uv.Prepare.prototype
+  duk_get_prop_string(ctx, -2, "Prepare");
+  duk_push_object(ctx);
+  duk_put_function_list(ctx, -1, duv_prepare_methods);
+  duk_dup(ctx, -3);
+  duk_set_prototype(ctx, -2);
+  duk_put_prop_string(ctx, -2, "prototype");
+  duk_pop(ctx);
+
+  // stack: nucleus uv Handle.prototype
+
   // uv.Stream.prototype
   duk_push_object(ctx);
   duk_put_function_list(ctx, -1, duv_stream_methods);
diff --git a/implementations/duktape/duv/duv.h b/implementations/duktape/duv/duv.h
index 3525212..a652e6d 100644
--- a/implementations/duktape/duv/duv.h
+++ b/implementations/duktape/duv/duv.h
@@ -6,13 +6,19 @@
 
 typedef enum {
   DUV_TIMER,
+  DUV_PREPARE,
   DUV_TCP,
   DUV_PIPE,
 } duv_type_t;
 
 typedef enum {
-  DUV_HANDLE_MASK = 1 << DUV_TIMER | 1 << DUV_TCP | 1 << DUV_PIPE,
+  DUV_HANDLE_MASK =
+    1 << DUV_TIMER |
+    1 << DUV_PREPARE |
+    1 << DUV_TCP |
+    1 << DUV_PIPE,
   DUV_TIMER_MASK = 1 << DUV_TIMER,
+  DUV_PREPARE_MASK = 1 << DUV_PREPARE,
   DUV_STREAM_MASK = 1 << DUV_TCP | 1 << DUV_PIPE,
   DUV_TCP_MASK = 1 << DUV_TCP,
   DUV_PIPE_MASK = 1 << DUV_PIPE,
diff --git a/implementations/duktape/duv/handle.c b/implementations/duktape/duv/handle.c
index f290a4c..b1198bf 100644
--- a/implementations/duktape/duv/handle.c
+++ b/implementations/duktape/duv/handle.c
@@ -28,21 +28,31 @@ duk_ret_t duv_close(duk_context *ctx) {
 
 
 duk_ret_t duv_is_active(duk_context *ctx) {
-  duk_error(ctx, DUK_ERR_UNIMPLEMENTED_ERROR, "TODO: Implement duv_is_active");
+  uv_handle_t *handle = duv_require_this_handle(ctx, DUV_HANDLE_MASK);
+  duk_push_boolean(ctx, uv_is_active(handle));
+  return 1;
 }
 
 duk_ret_t duv_is_closing(duk_context *ctx) {
-  duk_error(ctx, DUK_ERR_UNIMPLEMENTED_ERROR, "TODO: Implement duv_is_closing");
+  uv_handle_t *handle = duv_require_this_handle(ctx, DUV_HANDLE_MASK);
+  duk_push_boolean(ctx, uv_is_closing(handle));
+  return 1;
 }
 
 duk_ret_t duv_ref(duk_context *ctx) {
-  duk_error(ctx, DUK_ERR_UNIMPLEMENTED_ERROR, "TODO: Implement duv_ref");
+  uv_handle_t *handle = duv_require_this_handle(ctx, DUV_HANDLE_MASK);
+  uv_ref(handle);
+  return 0;
 }
 
 duk_ret_t duv_unref(duk_context *ctx) {
-  duk_error(ctx, DUK_ERR_UNIMPLEMENTED_ERROR, "TODO: Implement duv_unref");
+  uv_handle_t *handle = duv_require_this_handle(ctx, DUV_HANDLE_MASK);
+  uv_unref(handle);
+  return 0;
 }
 
 duk_ret_t duv_has_ref(duk_context *ctx) {
-  duk_error(ctx, DUK_ERR_UNIMPLEMENTED_ERROR, "TODO: Implement duv_has_ref");
+  uv_handle_t *handle = duv_require_this_handle(ctx, DUV_HANDLE_MASK);
+  duk_push_boolean(ctx, uv_has_ref(handle));
+  return 1;
 }
diff --git a/implementations/duktape/duv/prepare.c b/implementations/duktape/duv/prepare.c
index 29eaf9c..e016230 100644
--- a/implementations/duktape/duv/prepare.c
+++ b/implementations/duktape/duv/prepare.c
@@ -1 +1,28 @@
 #include "prepare.h"
+#include "utils.h"
+#include "callbacks.h"
+
+duk_ret_t duv_prepare(duk_context *ctx) {
+  uv_prepare_t *prepare = duk_push_fixed_buffer(ctx, sizeof(uv_prepare_t));
+  duv_check(ctx, uv_prepare_init(duv_loop(ctx), prepare));
+  duv_setup_handle(ctx, (uv_handle_t*)prepare, DUV_PREPARE);
+  return 1;
+}
+
+duk_ret_t duv_prepare_start(duk_context *ctx) {
+  dschema_check(ctx, (const duv_schema_entry[]) {
+    {"callback", duk_is_function},
+    {0,0}
+  });
+  uv_prepare_t *prepare = duv_require_this_handle(ctx, DUV_PREPARE_MASK);
+  duk_put_prop_string(ctx, 0, "\xffon-prepare");
+  duv_check(ctx, uv_prepare_start(prepare, duv_on_prepare));
+  return 0;
+}
+
+duk_ret_t duv_prepare_stop(duk_context *ctx) {
+  uv_prepare_t *prepare = duv_require_this_handle(ctx, DUV_PREPARE_MASK);
+  duk_del_prop_string(ctx, -1, "\xffon-prepare");
+  duv_check(ctx, uv_prepare_stop(prepare));
+  return 0;
+}
diff --git a/implementations/duktape/duv/prepare.h b/implementations/duktape/duv/prepare.h
index 65fc6b2..bd2146e 100644
--- a/implementations/duktape/duv/prepare.h
+++ b/implementations/duktape/duv/prepare.h
@@ -3,4 +3,8 @@
 
 #include "duv.h"
 
+duk_ret_t duv_prepare(duk_context *ctx);
+duk_ret_t duv_prepare_start(duk_context *ctx);
+duk_ret_t duv_prepare_stop(duk_context *ctx);
+
 #endif
diff --git a/implementations/duktape/duv/timer.c b/implementations/duktape/duv/timer.c
index bd26a81..7feaea8 100644
--- a/implementations/duktape/duv/timer.c
+++ b/implementations/duktape/duv/timer.c
@@ -19,7 +19,7 @@ duk_ret_t duv_timer_start(duk_context *ctx) {
   uv_timer_t *timer = duv_require_this_handle(ctx, DUV_TIMER_MASK);
   int timeout = duk_get_int(ctx, 1);
   int repeat = duk_get_int(ctx, 2);
-  duk_put_prop_string(ctx, -4, "\xffon-timeout");
+  duk_put_prop_string(ctx, 0, "\xffon-timeout");
   duv_check(ctx, uv_timer_start(timer, duv_on_timeout, timeout, repeat));
   return 0;
 }
diff --git a/implementations/duktape/duv/utils.c b/implementations/duktape/duv/utils.c
index 3d703b2..39f0c86 100644
--- a/implementations/duktape/duv/utils.c
+++ b/implementations/duktape/duv/utils.c
@@ -4,6 +4,7 @@
 const char* duv_type_to_string(duv_type_t type) {
   switch (type) {
     case DUV_TIMER: return "uv_timer_t";
+    case DUV_PREPARE: return "uv_prepare_t";
     case DUV_TCP: return "uv_tcp_t";
     case DUV_PIPE: return "uv_pipe_t";
   }
@@ -14,6 +15,7 @@ const char* duv_mask_to_string(duv_type_mask_t mask) {
   switch (mask) {
     case DUV_HANDLE_MASK: return "uv_handle_t";
     case DUV_TIMER_MASK: return "uv_timer_t";
+    case DUV_PREPARE_MASK: return "uv_prepare_t";
     case DUV_STREAM_MASK: return "uv_stream_t";
     case DUV_TCP_MASK: return "uv_tcp_t";
     case DUV_PIPE_MASK: return "uv_pipe_t";
diff --git a/implementations/duktape/main.c b/implementations/duktape/main.c
index b845aa3..6e5e029 100644
--- a/implementations/duktape/main.c
+++ b/implementations/duktape/main.c
@@ -472,6 +472,7 @@ int main(int argc, char *argv[]) {
   // Run main.js function
   duk_push_string(ctx, "nucleus.dofile('main.js')");
   if (duk_peval(ctx)) {
+    duk_dump_context_stderr(ctx);
     fprintf(stderr, "Uncaught %s\n", duk_safe_to_string(ctx, -1));
     exit(1);
   }