diff --git a/src/components/channelMapper/channelMapper.js b/src/components/channelMapper/channelMapper.js
index 89d085c185..a5e5cc3537 100644
--- a/src/components/channelMapper/channelMapper.js
+++ b/src/components/channelMapper/channelMapper.js
@@ -19,11 +19,11 @@ export default class channelMapper {
             connectionManager.getApiClient(options.serverId).ajax({
                 type: 'POST',
                 url: ApiClient.getUrl('LiveTv/ChannelMappings'),
-                data: {
+                data: JSON.stringify({
                     providerId: providerId,
                     tunerChannelId: channelId,
                     providerChannelId: providerChannelId
-                },
+                }),
                 dataType: 'json'
             }).then(mapping => {
                 const listItem = dom.parentWithClass(button, 'listItem');
diff --git a/src/components/directorybrowser/directorybrowser.js b/src/components/directorybrowser/directorybrowser.js
index 41744bdcbb..5c44db3b15 100644
--- a/src/components/directorybrowser/directorybrowser.js
+++ b/src/components/directorybrowser/directorybrowser.js
@@ -166,10 +166,10 @@ import 'emby-button';
         return apiClient.ajax({
             type: 'POST',
             url: apiClient.getUrl('Environment/ValidatePath'),
-            data: {
+            data: JSON.stringify({
                 ValidateWriteable: validateWriteable,
                 Path: path
-            }
+            })
         }).catch(response => {
             if (response) {
                 if (response.status === 404) {
diff --git a/src/controllers/dashboard/encodingsettings.js b/src/controllers/dashboard/encodingsettings.js
index 3a0ad24430..320a679b37 100644
--- a/src/controllers/dashboard/encodingsettings.js
+++ b/src/controllers/dashboard/encodingsettings.js
@@ -45,10 +45,10 @@ import libraryMenu from 'libraryMenu';
             return ApiClient.ajax({
                 url: ApiClient.getUrl('System/MediaEncoder/Path'),
                 type: 'POST',
-                data: {
+                data: JSON.stringify({
                     Path: form.querySelector('.txtEncoderPath').value,
                     PathType: 'Custom'
-                }
+                })
             }).then(Dashboard.processServerConfigurationUpdateResult, onSaveEncodingPathFailure);
         });
     }
diff --git a/src/controllers/session/forgotPassword/index.js b/src/controllers/session/forgotPassword/index.js
index 368642db35..45e05409da 100644
--- a/src/controllers/session/forgotPassword/index.js
+++ b/src/controllers/session/forgotPassword/index.js
@@ -41,9 +41,9 @@ import globalize from 'globalize';
                 type: 'POST',
                 url: ApiClient.getUrl('Users/ForgotPassword'),
                 dataType: 'json',
-                data: {
+                data: JSON.stringify({
                     EnteredUsername: view.querySelector('#txtName').value
-                }
+                })
             }).then(processForgotPasswordResult);
             e.preventDefault();
             return false;
diff --git a/src/controllers/session/resetPassword/index.js b/src/controllers/session/resetPassword/index.js
index a88e131eea..3cb8d4a9e2 100644
--- a/src/controllers/session/resetPassword/index.js
+++ b/src/controllers/session/resetPassword/index.js
@@ -29,9 +29,9 @@ import globalize from 'globalize';
                 type: 'POST',
                 url: ApiClient.getUrl('Users/ForgotPassword/Pin'),
                 dataType: 'json',
-                data: {
+                data: JSON.stringify({
                     Pin: view.querySelector('#txtPin').value
-                }
+                })
             }).then(processForgotPasswordResult);
             e.preventDefault();
             return false;
diff --git a/src/controllers/wizard/remote/index.js b/src/controllers/wizard/remote/index.js
index 3c482607de..74c795658d 100644
--- a/src/controllers/wizard/remote/index.js
+++ b/src/controllers/wizard/remote/index.js
@@ -11,7 +11,7 @@ function save(page) {
     config.EnableAutomaticPortMapping = page.querySelector('#chkEnableUpnp').checked;
     apiClient.ajax({
         type: 'POST',
-        data: config,
+        data: JSON.stringify(config),
         url: apiClient.getUrl('Startup/RemoteAccess')
     }).then(function () {
         loading.hide();
diff --git a/src/controllers/wizard/settings/index.js b/src/controllers/wizard/settings/index.js
index a1c3c11267..2eaef4fab6 100644
--- a/src/controllers/wizard/settings/index.js
+++ b/src/controllers/wizard/settings/index.js
@@ -11,7 +11,7 @@ function save(page) {
         config.MetadataCountryCode = page.querySelector('#selectCountry').value;
         apiClient.ajax({
             type: 'POST',
-            data: config,
+            data: JSON.stringify(config),
             url: apiClient.getUrl('Startup/Configuration')
         }).then(function () {
             loading.hide();
diff --git a/src/controllers/wizard/start/index.js b/src/controllers/wizard/start/index.js
index cec93446db..8c147fc75e 100644
--- a/src/controllers/wizard/start/index.js
+++ b/src/controllers/wizard/start/index.js
@@ -17,7 +17,7 @@ function save(page) {
         config.UICulture = $('#selectLocalizationLanguage', page).val();
         apiClient.ajax({
             type: 'POST',
-            data: config,
+            data: JSON.stringify(config),
             url: apiClient.getUrl('Startup/Configuration')
         }).then(function () {
             Dashboard.navigate('wizarduser.html');
diff --git a/src/controllers/wizard/user/index.js b/src/controllers/wizard/user/index.js
index 855086a3a4..fc9a27855f 100644
--- a/src/controllers/wizard/user/index.js
+++ b/src/controllers/wizard/user/index.js
@@ -23,10 +23,10 @@ function submit(form) {
     const apiClient = getApiClient();
     apiClient.ajax({
         type: 'POST',
-        data: {
+        data: JSON.stringify({
             Name: form.querySelector('#txtUsername').value,
             Password: form.querySelector('#txtManualPassword').value
-        },
+        }),
         url: apiClient.getUrl('Startup/User')
     }).then(onUpdateUserComplete);
 }