diff --git a/app/rest/request_json.h b/app/rest/request_json.h
index 9f37830b27..964ffbd529 100644
--- a/app/rest/request_json.h
+++ b/app/rest/request_json.h
@@ -41,6 +41,7 @@ class RequestJson : public Request {
   explicit RequestJson(const char* schema) : application_data_(new FbsTypeT()) {
     flatbuffers::IDLOptions fbs_options;
     fbs_options.skip_unexpected_fields_in_json = true;
+    fbs_options.strict_json = true;
     parser_.reset(new flatbuffers::Parser(fbs_options));
 
     bool parse_status = parser_->Parse(schema);
diff --git a/app/rest/tests/request_json_test.cc b/app/rest/tests/request_json_test.cc
index 052549c493..058c925c6d 100644
--- a/app/rest/tests/request_json_test.cc
+++ b/app/rest/tests/request_json_test.cc
@@ -64,8 +64,8 @@ TEST(RequestJsonTest, UpdatePostFields) {
   request.set_token("abc");
   EXPECT_EQ(
       "{\n"
-      "  token: \"abc\",\n"
-      "  number: 123\n"
+      "  \"token\": \"abc\",\n"
+      "  \"number\": 123\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/src/android/auth_android.cc b/auth/src/android/auth_android.cc
index 2f8ccda645..965db474a4 100644
--- a/auth/src/android/auth_android.cc
+++ b/auth/src/android/auth_android.cc
@@ -195,10 +195,12 @@ void CheckEmulator(AuthData* auth_data) {
 
   // Use emulator as long as this env variable is set, regardless its value.
   if (std::getenv("USE_AUTH_EMULATOR") == nullptr) {
-    LogDebug("Using Auth Prod for testing.");
+    LogInfo("Using Auth Prod for testing.");
     return;
   }
 
+  LogInfo("Using Auth Emulator for testing.");
+
   // Use AUTH_EMULATOR_PORT if it is set to non empty string,
   // otherwise use the default port.
   uint32_t port = std::stoi(kEmulatorPort);
diff --git a/auth/src/desktop/rpcs/auth_request.cc b/auth/src/desktop/rpcs/auth_request.cc
index c9af69f789..77fb7ea07c 100644
--- a/auth/src/desktop/rpcs/auth_request.cc
+++ b/auth/src/desktop/rpcs/auth_request.cc
@@ -88,6 +88,7 @@ std::string AuthRequest::GetUrl() {
   } else {
     std::string url(kHttp);
     url += emulator_url;
+    url += "/";
     url += kServerURL;
     return url;
   }
@@ -95,15 +96,15 @@ std::string AuthRequest::GetUrl() {
 
 void AuthRequest::CheckEmulator() {
   if (!emulator_url.empty()) {
-    LogDebug("Emulator Url already set: %s", emulator_url.c_str());
+    LogInfo("Emulator Url already set: %s", emulator_url.c_str());
     return;
   }
   // Use emulator as long as this env variable is set, regardless its value.
   if (std::getenv("USE_AUTH_EMULATOR") == nullptr) {
-    LogDebug("Using Auth Prod for testing.");
+    LogInfo("Using Auth Prod for testing.");
     return;
   }
-
+  LogInfo("Using Auth Emulator.");
   emulator_url.append(kEmulatorLocalHost);
   emulator_url.append(":");
   // Use AUTH_EMULATOR_PORT if it is set to non empty string,
diff --git a/auth/src/ios/auth_ios.mm b/auth/src/ios/auth_ios.mm
index e66af55dd6..323a1c633a 100644
--- a/auth/src/ios/auth_ios.mm
+++ b/auth/src/ios/auth_ios.mm
@@ -160,10 +160,10 @@ void UpdateCurrentUser(AuthData *auth_data) {
 void CheckEmulator(AuthData *auth_data) {
   // Use emulator as long as this env variable is set, regardless its value.
   if (std::getenv("USE_AUTH_EMULATOR") == nullptr) {
-    LogDebug("Using Auth Prod for testing.");
+    LogInfo("Using Auth Prod for testing.");
     return;
   }
-
+  LogInfo("Using Auth Emulator.");
   // Use AUTH_EMULATOR_PORT if it is set to non empty string,
   // otherwise use the default port.
   uint32_t port = std::stoi(kEmulatorPort);
diff --git a/auth/tests/desktop/rpcs/create_auth_uri_test.cc b/auth/tests/desktop/rpcs/create_auth_uri_test.cc
index e46b5bb49a..91a393f441 100644
--- a/auth/tests/desktop/rpcs/create_auth_uri_test.cc
+++ b/auth/tests/desktop/rpcs/create_auth_uri_test.cc
@@ -36,8 +36,8 @@ TEST(CreateAuthUriTest, TestCreateAuthUriRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  identifier: \"email\",\n"
-      "  continueUri: \"http://localhost\"\n"
+      "  \"identifier\": \"email\",\n"
+      "  \"continueUri\": \"http://localhost\"\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/delete_account_test.cc b/auth/tests/desktop/rpcs/delete_account_test.cc
index d24c72be6b..e6d8a98bcf 100644
--- a/auth/tests/desktop/rpcs/delete_account_test.cc
+++ b/auth/tests/desktop/rpcs/delete_account_test.cc
@@ -37,7 +37,7 @@ TEST(DeleteAccountTest, TestDeleteAccountRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  idToken: \"token\"\n"
+      "  \"idToken\": \"token\"\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/get_account_info_test.cc b/auth/tests/desktop/rpcs/get_account_info_test.cc
index 4822bd2e9c..368b079b93 100644
--- a/auth/tests/desktop/rpcs/get_account_info_test.cc
+++ b/auth/tests/desktop/rpcs/get_account_info_test.cc
@@ -36,7 +36,7 @@ TEST(GetAccountInfoTest, TestGetAccountInfoRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  idToken: \"token\"\n"
+      "  \"idToken\": \"token\"\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/get_oob_confirmation_code_test.cc b/auth/tests/desktop/rpcs/get_oob_confirmation_code_test.cc
index c6a20fd7e1..cf9717853d 100644
--- a/auth/tests/desktop/rpcs/get_oob_confirmation_code_test.cc
+++ b/auth/tests/desktop/rpcs/get_oob_confirmation_code_test.cc
@@ -40,8 +40,8 @@ TEST(GetOobConfirmationCodeTest, SendVerifyEmailRequest) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  idToken: \"token\",\n"
-      "  requestType: \"VERIFY_EMAIL\"\n"
+      "  \"idToken\": \"token\",\n"
+      "  \"requestType\": \"VERIFY_EMAIL\"\n"
       "}\n",
       request->options().post_fields);
 }
@@ -56,8 +56,8 @@ TEST(GetOobConfirmationCodeTest, SendPasswordResetEmailRequest) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  email: \"email\",\n"
-      "  requestType: \"PASSWORD_RESET\"\n"
+      "  \"email\": \"email\",\n"
+      "  \"requestType\": \"PASSWORD_RESET\"\n"
       "}\n",
       request->options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/reset_password_test.cc b/auth/tests/desktop/rpcs/reset_password_test.cc
index 480168b9d3..2901ca596e 100644
--- a/auth/tests/desktop/rpcs/reset_password_test.cc
+++ b/auth/tests/desktop/rpcs/reset_password_test.cc
@@ -35,8 +35,8 @@ TEST(ResetPasswordTest, TestResetPasswordRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  oobCode: \"oob\",\n"
-      "  newPassword: \"password\"\n"
+      "  \"oobCode\": \"oob\",\n"
+      "  \"newPassword\": \"password\"\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/secure_token_test.cc b/auth/tests/desktop/rpcs/secure_token_test.cc
index 217b148d8a..ff6fd589c4 100644
--- a/auth/tests/desktop/rpcs/secure_token_test.cc
+++ b/auth/tests/desktop/rpcs/secure_token_test.cc
@@ -34,8 +34,8 @@ TEST(SecureTokenTest, TestSetRefreshRequest) {
             request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  grantType: \"refresh_token\",\n"
-      "  refreshToken: \"token123\"\n"
+      "  \"grantType\": \"refresh_token\",\n"
+      "  \"refreshToken\": \"token123\"\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/set_account_info_test.cc b/auth/tests/desktop/rpcs/set_account_info_test.cc
index 0a591ea44f..ce38726238 100644
--- a/auth/tests/desktop/rpcs/set_account_info_test.cc
+++ b/auth/tests/desktop/rpcs/set_account_info_test.cc
@@ -41,9 +41,9 @@ TEST(SetAccountInfoTest, TestSetAccountInfoRequest_UpdateEmail) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  email: \"fakeemail\",\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\"\n"
+      "  \"email\": \"fakeemail\",\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\"\n"
       "}\n",
       request->options().post_fields);
 }
@@ -60,9 +60,9 @@ TEST(SetAccountInfoTest, TestSetAccountInfoRequest_UpdatePassword) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  password: \"fakepassword\",\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\"\n"
+      "  \"password\": \"fakepassword\",\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\"\n"
       "}\n",
       request->options().post_fields);
 }
@@ -79,10 +79,10 @@ TEST(SetAccountInfoTest, TestSetAccountInfoRequest_UpdateProfile_Full) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  displayName: \"New Name\",\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\",\n"
-      "  photoUrl: \"new_url\"\n"
+      "  \"displayName\": \"New Name\",\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\",\n"
+      "  \"photoUrl\": \"new_url\"\n"
       "}\n",
       request->options().post_fields);
 }
@@ -99,9 +99,9 @@ TEST(SetAccountInfoTest, TestSetAccountInfoRequest_UpdateProfile_Partial) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\",\n"
-      "  photoUrl: \"new_url\"\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\",\n"
+      "  \"photoUrl\": \"new_url\"\n"
       "}\n",
       request->options().post_fields);
 }
@@ -117,9 +117,9 @@ TEST(SetAccountInfoTest, TestSetAccountInfoRequest_UpdateProfile_DeleteFields) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\",\n"
-      "  deleteAttribute: [\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\",\n"
+      "  \"deleteAttribute\": [\n"
       "    \"DISPLAY_NAME\",\n"
       "    \"PHOTO_URL\"\n"
       "  ]\n"
@@ -140,10 +140,10 @@ TEST(SetAccountInfoTest,
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\",\n"
-      "  photoUrl: \"new_url\",\n"
-      "  deleteAttribute: [\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\",\n"
+      "  \"photoUrl\": \"new_url\",\n"
+      "  \"deleteAttribute\": [\n"
       "    \"DISPLAY_NAME\"\n"
       "  ]\n"
       "}\n",
@@ -162,9 +162,9 @@ TEST(SetAccountInfoTest, TestSetAccountInfoRequest_Unlink) {
       request->options().url);
   EXPECT_EQ(
       "{\n"
-      "  returnSecureToken: true,\n"
-      "  idToken: \"token\",\n"
-      "  deleteProvider: [\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"idToken\": \"token\",\n"
+      "  \"deleteProvider\": [\n"
       "    \"fakeprovider\"\n"
       "  ]\n"
       "}\n",
diff --git a/auth/tests/desktop/rpcs/sign_up_new_user_test.cc b/auth/tests/desktop/rpcs/sign_up_new_user_test.cc
index 870deb0fd5..a7b3374bce 100644
--- a/auth/tests/desktop/rpcs/sign_up_new_user_test.cc
+++ b/auth/tests/desktop/rpcs/sign_up_new_user_test.cc
@@ -35,7 +35,7 @@ TEST(SignUpNewUserTest, TestAnonymousSignInRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  returnSecureToken: true\n"
+      "  \"returnSecureToken\": true\n"
       "}\n",
       request.options().post_fields);
 }
@@ -50,10 +50,10 @@ TEST(SignUpNewUserTest, TestEmailPasswordSignInRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  email: \"e@mail\",\n"
-      "  password: \"pwd\",\n"
-      "  displayName: \"rabbit\",\n"
-      "  returnSecureToken: true\n"
+      "  \"email\": \"e@mail\",\n"
+      "  \"password\": \"pwd\",\n"
+      "  \"displayName\": \"rabbit\",\n"
+      "  \"returnSecureToken\": true\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/verify_custom_token_test.cc b/auth/tests/desktop/rpcs/verify_custom_token_test.cc
index 49241c9ef0..7d4341d37b 100644
--- a/auth/tests/desktop/rpcs/verify_custom_token_test.cc
+++ b/auth/tests/desktop/rpcs/verify_custom_token_test.cc
@@ -36,8 +36,8 @@ TEST(VerifyCustomTokenTest, TestVerifyCustomTokenRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  returnSecureToken: true,\n"
-      "  token: \"token123\"\n"
+      "  \"returnSecureToken\": true,\n"
+      "  \"token\": \"token123\"\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/auth/tests/desktop/rpcs/verify_password_test.cc b/auth/tests/desktop/rpcs/verify_password_test.cc
index 8fe1b1ee25..0383245467 100644
--- a/auth/tests/desktop/rpcs/verify_password_test.cc
+++ b/auth/tests/desktop/rpcs/verify_password_test.cc
@@ -35,9 +35,9 @@ TEST(VerifyPasswordTest, TestVerifyPasswordRequest) {
       request.options().url);
   EXPECT_EQ(
       "{\n"
-      "  email: \"abc@email\",\n"
-      "  password: \"pwd\",\n"
-      "  returnSecureToken: true\n"
+      "  \"email\": \"abc@email\",\n"
+      "  \"password\": \"pwd\",\n"
+      "  \"returnSecureToken\": true\n"
       "}\n",
       request.options().post_fields);
 }
diff --git a/release_build_files/readme.md b/release_build_files/readme.md
index 788ce32f29..9b03e10cdb 100644
--- a/release_build_files/readme.md
+++ b/release_build_files/readme.md
@@ -627,6 +627,12 @@ workflow use only during the development of your app, not for publicly shipping
 code.
 
 ## Release Notes
+### Next Release
+-   Changes
+    - Auth: Add Firebase Auth Emulator support. Set the environment variable
+      USE_AUTH_EMULATOR=yes (and optionally AUTH_EMULATOR_PORT, default 9099) 
+      to connect to the local Firebase Auth Emulator.
+
 ### 11.4.0
 -   Changes
     - General (Android): Update to Firebase Android BoM version 32.2.2.