diff --git a/doc/api/n-api.md b/doc/api/n-api.md
index 4797e62fd97d46..3bfd0b438cd38f 100644
--- a/doc/api/n-api.md
+++ b/doc/api/n-api.md
@@ -552,11 +552,18 @@ thrown to immediately terminate the process.
 added: REPLACEME
 -->
 ```C
-NAPI_NO_RETURN void napi_fatal_error(const char* location, const char* message);
+NAPI_NO_RETURN void napi_fatal_error(const char* location,
+                                                 size_t location_len,
+                                                 const char* message,
+                                                 size_t message_len);
 ```
 
 - `[in] location`: Optional location at which the error occurred.
+- `[in] location_len`: The length of the location in bytes, or -1 if it is
+null-terminated.
 - `[in] message`: The message associated with the error.
+- `[in] message_len`: The length of the message in bytes, or -1 if it is
+null-terminated.
 
 The function call does not return, the process will be terminated.
 
@@ -1248,6 +1255,7 @@ added: v8.0.0
 ```C
 napi_status napi_create_function(napi_env env,
                                  const char* utf8name,
+                                 size_t length,
                                  napi_callback cb,
                                  void* data,
                                  napi_value* result)
@@ -1256,6 +1264,8 @@ napi_status napi_create_function(napi_env env,
 - `[in] env`: The environment that the API is invoked under.
 - `[in] utf8name`: A string representing the name of the function encoded as
 UTF8.
+- `[in] length`: The length of the utf8name in bytes, or -1 if it is
+null-terminated.
 - `[in] cb`: A function pointer to the native function to be invoked when the
 created function is invoked from JavaScript.
 - `[in] data`: Optional arbitrary context data to be passed into the native
@@ -3026,6 +3036,7 @@ added: v8.0.0
 ```C
 napi_status napi_define_class(napi_env env,
                               const char* utf8name,
+                              size_t length,
                               napi_callback constructor,
                               void* data,
                               size_t property_count,
@@ -3037,6 +3048,8 @@ napi_status napi_define_class(napi_env env,
  - `[in] utf8name`: Name of the JavaScript constructor function; this is
    not required to be the same as the C++ class name, though it is recommended
    for clarity.
+ - `[in] length`: The length of the utf8name in bytes, or -1 if it is
+null-terminated.
  - `[in] constructor`: Callback function that handles constructing instances
    of the class. (This should be a static method on the class, not an actual
    C++ constructor function.)
diff --git a/src/node_api.cc b/src/node_api.cc
index 7c68abfc6797de..44751a8f945da9 100644
--- a/src/node_api.cc
+++ b/src/node_api.cc
@@ -938,12 +938,29 @@ napi_status napi_get_last_error_info(napi_env env,
 }
 
 NAPI_NO_RETURN void napi_fatal_error(const char* location,
-                                     const char* message) {
-  node::FatalError(location, message);
+                                     size_t location_len,
+                                     const char* message,
+                                     size_t message_len) {
+  char* location_string = const_cast<char*>(location);
+  char* message_string = const_cast<char*>(message);
+  if (location_len != -1) {
+    location_string = reinterpret_cast<char*>(
+        malloc(location_len * sizeof(char) + 1));
+    strncpy(location_string, location, location_len);
+    location_string[location_len] = '\0';
+  }
+  if (message_len != -1) {
+    message_string = reinterpret_cast<char*>(
+        malloc(message_len * sizeof(char) + 1));
+    strncpy(message_string, message, message_len);
+    message_string[message_len] = '\0';
+  }
+  node::FatalError(location_string, message_string);
 }
 
 napi_status napi_create_function(napi_env env,
                                  const char* utf8name,
+                                 size_t length,
                                  napi_callback cb,
                                  void* callback_data,
                                  napi_value* result) {
@@ -970,7 +987,7 @@ napi_status napi_create_function(napi_env env,
 
   if (utf8name != nullptr) {
     v8::Local<v8::String> name_string;
-    CHECK_NEW_FROM_UTF8(env, name_string, utf8name);
+    CHECK_NEW_FROM_UTF8_LEN(env, name_string, utf8name, length);
     return_value->SetName(name_string);
   }
 
@@ -981,6 +998,7 @@ napi_status napi_create_function(napi_env env,
 
 napi_status napi_define_class(napi_env env,
                               const char* utf8name,
+                              size_t length,
                               napi_callback constructor,
                               void* callback_data,
                               size_t property_count,
@@ -1002,7 +1020,7 @@ napi_status napi_define_class(napi_env env,
       isolate, v8impl::FunctionCallbackWrapper::Invoke, cbdata);
 
   v8::Local<v8::String> name_string;
-  CHECK_NEW_FROM_UTF8(env, name_string, utf8name);
+  CHECK_NEW_FROM_UTF8_LEN(env, name_string, utf8name, length);
   tpl->SetClassName(name_string);
 
   size_t static_property_count = 0;
diff --git a/src/node_api.h b/src/node_api.h
index e1a40983a9907d..82f2e1900e2fe4 100644
--- a/src/node_api.h
+++ b/src/node_api.h
@@ -109,7 +109,9 @@ napi_get_last_error_info(napi_env env,
                          const napi_extended_error_info** result);
 
 NAPI_EXTERN NAPI_NO_RETURN void napi_fatal_error(const char* location,
-                                                 const char* message);
+                                                 size_t location_len,
+                                                 const char* message,
+                                                 size_t message_len);
 
 // Getters for defined singletons
 NAPI_EXTERN napi_status napi_get_undefined(napi_env env, napi_value* result);
@@ -154,6 +156,7 @@ NAPI_EXTERN napi_status napi_create_symbol(napi_env env,
                                            napi_value* result);
 NAPI_EXTERN napi_status napi_create_function(napi_env env,
                                              const char* utf8name,
+                                             size_t length,
                                              napi_callback cb,
                                              void* data,
                                              napi_value* result);
@@ -336,6 +339,7 @@ NAPI_EXTERN napi_status napi_get_new_target(napi_env env,
 NAPI_EXTERN napi_status
 napi_define_class(napi_env env,
                   const char* utf8name,
+                  size_t length,
                   napi_callback constructor,
                   void* data,
                   size_t property_count,
diff --git a/test/addons-napi/4_object_factory/binding.c b/test/addons-napi/4_object_factory/binding.c
index fe509c02ad13b6..6bdca80ec365be 100644
--- a/test/addons-napi/4_object_factory/binding.c
+++ b/test/addons-napi/4_object_factory/binding.c
@@ -16,7 +16,7 @@ napi_value CreateObject(napi_env env, napi_callback_info info) {
 
 napi_value Init(napi_env env, napi_value exports) {
   NAPI_CALL(env,
-      napi_create_function(env, "exports", CreateObject, NULL, &exports));
+      napi_create_function(env, "exports", -1, CreateObject, NULL, &exports));
   return exports;
 }
 
diff --git a/test/addons-napi/5_function_factory/binding.c b/test/addons-napi/5_function_factory/binding.c
index a2e03dd9bdd6b5..6b2b6f8f0ebe81 100644
--- a/test/addons-napi/5_function_factory/binding.c
+++ b/test/addons-napi/5_function_factory/binding.c
@@ -4,21 +4,19 @@
 napi_value MyFunction(napi_env env, napi_callback_info info) {
   napi_value str;
   NAPI_CALL(env, napi_create_string_utf8(env, "hello world", -1, &str));
-
   return str;
 }
 
 napi_value CreateFunction(napi_env env, napi_callback_info info) {
   napi_value fn;
   NAPI_CALL(env,
-      napi_create_function(env, "theFunction", MyFunction, NULL, &fn));
-
+    napi_create_function(env, "theFunction", -1, MyFunction, NULL, &fn));
   return fn;
 }
 
 napi_value Init(napi_env env, napi_value exports) {
   NAPI_CALL(env,
-      napi_create_function(env, "exports", CreateFunction, NULL, &exports));
+      napi_create_function(env, "exports", -1, CreateFunction, NULL, &exports));
   return exports;
 }
 
diff --git a/test/addons-napi/6_object_wrap/myobject.cc b/test/addons-napi/6_object_wrap/myobject.cc
index 90815253add651..aca91877d3a2ae 100644
--- a/test/addons-napi/6_object_wrap/myobject.cc
+++ b/test/addons-napi/6_object_wrap/myobject.cc
@@ -22,8 +22,8 @@ void MyObject::Init(napi_env env, napi_value exports) {
   };
 
   napi_value cons;
-  NAPI_CALL_RETURN_VOID(env,
-      napi_define_class(env, "MyObject", New, nullptr, 3, properties, &cons));
+  NAPI_CALL_RETURN_VOID(env, napi_define_class(
+      env, "MyObject", -1, New, nullptr, 3, properties, &cons));
 
   NAPI_CALL_RETURN_VOID(env, napi_create_reference(env, cons, 1, &constructor));
 
diff --git a/test/addons-napi/7_factory_wrap/binding.cc b/test/addons-napi/7_factory_wrap/binding.cc
index 4d02247f85b924..9d8f23c561d77a 100644
--- a/test/addons-napi/7_factory_wrap/binding.cc
+++ b/test/addons-napi/7_factory_wrap/binding.cc
@@ -16,7 +16,7 @@ napi_value Init(napi_env env, napi_value exports) {
   NAPI_CALL(env, MyObject::Init(env));
 
   NAPI_CALL(env,
-      napi_create_function(env, "exports", CreateObject, NULL, &exports));
+      napi_create_function(env, "exports", -1, CreateObject, NULL, &exports));
   return exports;
 }
 
diff --git a/test/addons-napi/7_factory_wrap/myobject.cc b/test/addons-napi/7_factory_wrap/myobject.cc
index c6d538a7cefbc6..4e1d79c1febc17 100644
--- a/test/addons-napi/7_factory_wrap/myobject.cc
+++ b/test/addons-napi/7_factory_wrap/myobject.cc
@@ -21,8 +21,8 @@ napi_status MyObject::Init(napi_env env) {
   };
 
   napi_value cons;
-  status =
-      napi_define_class(env, "MyObject", New, nullptr, 1, properties, &cons);
+  status = napi_define_class(
+      env, "MyObject", -1, New, nullptr, 1, properties, &cons);
   if (status != napi_ok) return status;
 
   status = napi_create_reference(env, cons, 1, &constructor);
diff --git a/test/addons-napi/8_passing_wrapped/myobject.cc b/test/addons-napi/8_passing_wrapped/myobject.cc
index 0c24d7696e66ec..19cc7dd2a29493 100644
--- a/test/addons-napi/8_passing_wrapped/myobject.cc
+++ b/test/addons-napi/8_passing_wrapped/myobject.cc
@@ -17,7 +17,8 @@ napi_status MyObject::Init(napi_env env) {
   napi_status status;
 
   napi_value cons;
-  status = napi_define_class(env, "MyObject", New, nullptr, 0, nullptr, &cons);
+  status = napi_define_class(
+      env, "MyObject", -1, New, nullptr, 0, nullptr, &cons);
   if (status != napi_ok) return status;
 
   status = napi_create_reference(env, cons, 1, &constructor);
diff --git a/test/addons-napi/test_constructor/binding.gyp b/test/addons-napi/test_constructor/binding.gyp
index 55140e7c379f02..1945a9fd5a711e 100644
--- a/test/addons-napi/test_constructor/binding.gyp
+++ b/test/addons-napi/test_constructor/binding.gyp
@@ -3,6 +3,10 @@
     {
       "target_name": "test_constructor",
       "sources": [ "test_constructor.c" ]
+    },
+    {
+      "target_name": "test_constructor_name",
+      "sources": [ "test_constructor_name.c" ]
     }
   ]
 }
diff --git a/test/addons-napi/test_constructor/test2.js b/test/addons-napi/test_constructor/test2.js
new file mode 100644
index 00000000000000..64c03cbc684ac3
--- /dev/null
+++ b/test/addons-napi/test_constructor/test2.js
@@ -0,0 +1,8 @@
+'use strict';
+const common = require('../../common');
+const assert = require('assert');
+
+// Testing api calls for a constructor that defines properties
+const TestConstructor =
+    require(`./build/${common.buildType}/test_constructor_name`);
+assert.strictEqual(TestConstructor.name, 'MyObject');
diff --git a/test/addons-napi/test_constructor/test_constructor.c b/test/addons-napi/test_constructor/test_constructor.c
index 437c32e12517fc..8b5b4e53ea7bc0 100644
--- a/test/addons-napi/test_constructor/test_constructor.c
+++ b/test/addons-napi/test_constructor/test_constructor.c
@@ -77,7 +77,7 @@ napi_value Init(napi_env env, napi_value exports) {
   };
 
   napi_value cons;
-  NAPI_CALL(env, napi_define_class(env, "MyObject", New,
+  NAPI_CALL(env, napi_define_class(env, "MyObject", -1, New,
       NULL, sizeof(properties)/sizeof(*properties), properties, &cons));
 
   NAPI_CALL(env, napi_create_reference(env, cons, 1, &constructor_));
diff --git a/test/addons-napi/test_constructor/test_constructor_name.c b/test/addons-napi/test_constructor/test_constructor_name.c
new file mode 100644
index 00000000000000..b178e80f49f489
--- /dev/null
+++ b/test/addons-napi/test_constructor/test_constructor_name.c
@@ -0,0 +1,23 @@
+#include <node_api.h>
+#include "../common.h"
+
+napi_ref constructor_;
+
+napi_value New(napi_env env, napi_callback_info info) {
+  napi_value _this;
+  NAPI_CALL(env, napi_get_cb_info(env, info, NULL, NULL, &_this, NULL));
+
+  return _this;
+}
+
+napi_value Init(napi_env env, napi_value exports) {
+  napi_value cons;
+  NAPI_CALL(env, napi_define_class(
+      env, "MyObject_Extra", 8, New, NULL, 0, NULL, &cons));
+
+  NAPI_CALL(env,
+      napi_create_reference(env, cons, 1, &constructor_));
+  return cons;
+}
+
+NAPI_MODULE(addon, Init)
diff --git a/test/addons-napi/test_env_sharing/compare_env.c b/test/addons-napi/test_env_sharing/compare_env.c
index df200f2a96f986..39adfb9b713ab3 100644
--- a/test/addons-napi/test_env_sharing/compare_env.c
+++ b/test/addons-napi/test_env_sharing/compare_env.c
@@ -15,7 +15,7 @@ napi_value compare(napi_env env, napi_callback_info info) {
 }
 
 napi_value Init(napi_env env, napi_value exports) {
-  NAPI_CALL(env, napi_create_function(env, "exports", compare, NULL, &exports));
+  NAPI_CALL(env, napi_create_function(env, "exports", -1, compare, NULL, &exports));
   return exports;
 }
 
diff --git a/test/addons-napi/test_fatal/test2.js b/test/addons-napi/test_fatal/test2.js
new file mode 100644
index 00000000000000..b9bde8f13016cc
--- /dev/null
+++ b/test/addons-napi/test_fatal/test2.js
@@ -0,0 +1,18 @@
+'use strict';
+const common = require('../../common');
+const assert = require('assert');
+const child_process = require('child_process');
+const test_fatal = require(`./build/${common.buildType}/test_fatal`);
+
+// Test in a child process because the test code will trigger a fatal error
+// that crashes the process.
+if (process.argv[2] === 'child') {
+  test_fatal.TestStringLength();
+  return;
+}
+
+const p = child_process.spawnSync(
+  process.execPath, [ '--napi-modules', __filename, 'child' ]);
+assert.ifError(p.error);
+assert.ok(p.stderr.toString().includes(
+  'FATAL ERROR: test_fatal::Test fatal message'));
diff --git a/test/addons-napi/test_fatal/test_fatal.c b/test/addons-napi/test_fatal/test_fatal.c
index f6cb2184a6e8e2..4159fa4b47f567 100644
--- a/test/addons-napi/test_fatal/test_fatal.c
+++ b/test/addons-napi/test_fatal/test_fatal.c
@@ -2,13 +2,19 @@
 #include "../common.h"
 
 napi_value Test(napi_env env, napi_callback_info info) {
-  napi_fatal_error("test_fatal::Test", "fatal message");
+  napi_fatal_error("test_fatal::Test", -1, "fatal message", -1);
+  return NULL;
+}
+
+napi_value TestStringLength(napi_env env, napi_callback_info info) {
+  napi_fatal_error("test_fatal::TestStringLength", 16, "fatal message", 13);
   return NULL;
 }
 
 napi_value Init(napi_env env, napi_value exports) {
   napi_property_descriptor properties[] = {
     DECLARE_NAPI_PROPERTY("Test", Test),
+    DECLARE_NAPI_PROPERTY("TestStringLength", TestStringLength),
   };
 
   NAPI_CALL(env, napi_define_properties(
diff --git a/test/addons-napi/test_function/test.js b/test/addons-napi/test_function/test.js
index bdb9133adf9346..752e9965b23039 100644
--- a/test/addons-napi/test_function/test.js
+++ b/test/addons-napi/test_function/test.js
@@ -9,20 +9,23 @@ const test_function = require(`./build/${common.buildType}/test_function`);
 function func1() {
   return 1;
 }
-assert.strictEqual(test_function.Test(func1), 1);
+assert.strictEqual(test_function.TestCall(func1), 1);
 
 function func2() {
   console.log('hello world!');
   return null;
 }
-assert.strictEqual(test_function.Test(func2), null);
+assert.strictEqual(test_function.TestCall(func2), null);
 
 function func3(input) {
   return input + 1;
 }
-assert.strictEqual(test_function.Test(func3, 1), 2);
+assert.strictEqual(test_function.TestCall(func3, 1), 2);
 
 function func4(input) {
   return func3(input);
 }
-assert.strictEqual(test_function.Test(func4, 1), 2);
+assert.strictEqual(test_function.TestCall(func4, 1), 2);
+
+assert.strictEqual(test_function.TestName.name, 'Name');
+assert.strictEqual(test_function.TestNameShort.name, 'Name_');
diff --git a/test/addons-napi/test_function/test_function.c b/test/addons-napi/test_function/test_function.c
index 2cb25db5beaf03..77495d9b8a3a46 100644
--- a/test/addons-napi/test_function/test_function.c
+++ b/test/addons-napi/test_function/test_function.c
@@ -1,7 +1,7 @@
 #include <node_api.h>
 #include "../common.h"
 
-napi_value Test(napi_env env, napi_callback_info info) {
+napi_value TestCallFunction(napi_env env, napi_callback_info info) {
   size_t argc = 10;
   napi_value args[10];
   NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
@@ -26,10 +26,25 @@ napi_value Test(napi_env env, napi_callback_info info) {
   return result;
 }
 
+void TestFunctionName(napi_env env, napi_callback_info info) {}
+
 napi_value Init(napi_env env, napi_value exports) {
-  napi_value fn;
-  NAPI_CALL(env, napi_create_function(env, NULL, Test, NULL, &fn));
-  NAPI_CALL(env, napi_set_named_property(env, exports, "Test", fn));
+  napi_value fn1;
+  NAPI_CALL(env, napi_create_function(
+      env, NULL, -1, TestCallFunction, NULL, &fn1));
+
+  napi_value fn2;
+  NAPI_CALL(env, napi_create_function(
+      env, "Name", -1, TestFunctionName, NULL, &fn2));
+
+  napi_value fn3;
+  NAPI_CALL(env, napi_create_function(
+      env, "Name_extra", 5, TestFunctionName, NULL, &fn3));
+
+  NAPI_CALL(env, napi_set_named_property(env, exports, "TestCall", fn1));
+  NAPI_CALL(env, napi_set_named_property(env, exports, "TestName", fn2));
+  NAPI_CALL(env, napi_set_named_property(env, exports, "TestNameShort", fn3));
+
   return exports;
 }
 
diff --git a/test/addons-napi/test_make_callback/binding.cc b/test/addons-napi/test_make_callback/binding.cc
index 9032e8b2f3f301..18bf46764be40c 100644
--- a/test/addons-napi/test_make_callback/binding.cc
+++ b/test/addons-napi/test_make_callback/binding.cc
@@ -45,7 +45,7 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {
 
 napi_value Init(napi_env env, napi_value exports) {
   napi_value fn;
-  NAPI_CALL(env, napi_create_function(env, NULL, MakeCallback, NULL, &fn));
+  NAPI_CALL(env, napi_create_function(env, NULL, -1, MakeCallback, NULL, &fn));
   NAPI_CALL(env, napi_set_named_property(env, exports, "makeCallback", fn));
   return exports;
 }
diff --git a/test/addons-napi/test_make_callback_recurse/binding.cc b/test/addons-napi/test_make_callback_recurse/binding.cc
index d0ee1ddb4998e6..ea823294352490 100644
--- a/test/addons-napi/test_make_callback_recurse/binding.cc
+++ b/test/addons-napi/test_make_callback_recurse/binding.cc
@@ -20,7 +20,7 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {
 
 napi_value Init(napi_env env, napi_value exports) {
   napi_value fn;
-  NAPI_CALL(env, napi_create_function(env, NULL, MakeCallback, NULL, &fn));
+  NAPI_CALL(env, napi_create_function(env, NULL, -1, MakeCallback, NULL, &fn));
   NAPI_CALL(env, napi_set_named_property(env, exports, "makeCallback", fn));
   return exports;
 }