diff --git a/lang/en.yml b/lang/en.yml
index ea3ab5e6..37f9f86e 100644
--- a/lang/en.yml
+++ b/lang/en.yml
@@ -1,17 +1,7 @@
 en:
   SilverStripe\LinkField\Controllers\LinkFieldController:
-    BAD_DATA: 'Bad data'
     CREATE_LINK: 'Create link'
-    EMPTY_DATA: 'Empty data'
-    INVALID_ID: 'Invalid ID'
-    INVALID_OWNER: 'Invalid Owner'
-    INVALID_OWNER_CLASS: 'Invalid ownerClass'
-    INVALID_OWNER_ID: 'Invalid ownerID'
-    INVALID_OWNER_RELATION: 'Invalid ownerRelation'
-    INVALID_TOKEN: 'Invalid CSRF token'
-    INVALID_TYPEKEY: 'Invalid typeKey'
-    MENUTITLE: SilverStripe\LinkField\Controllers\LinkFieldController
-    UNAUTHORIZED: Unauthorized
+    MENUTITLE: 'Link fields'
     UPDATE_LINK: 'Update link'
   SilverStripe\LinkField\Form\Traits\AllowedLinkClassesTrait:
     INVALID_TYPECLASS: '"{class}": {typeclass} is not a valid Link Type'
diff --git a/src/Controllers/LinkFieldController.php b/src/Controllers/LinkFieldController.php
index afa6f948..553f8e22 100644
--- a/src/Controllers/LinkFieldController.php
+++ b/src/Controllers/LinkFieldController.php
@@ -74,17 +74,17 @@ public function linkForm(): Form
         if ($id) {
             $link = Link::get()->byID($id);
             if (!$link) {
-                $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+                $this->jsonError(404);
             }
             $operation = 'edit';
             if (!$link->canView()) {
-                $this->jsonError(403, _t(__CLASS__ . '.UNAUTHORIZED', 'Unauthorized'));
+                $this->jsonError(403);
             }
         } else {
             $typeKey = $this->typeKeyFromRequest();
             $link = LinkTypeService::create()->byKey($typeKey);
             if (!$link) {
-                $this->jsonError(404, _t(__CLASS__ . '.INVALID_TYPEKEY', 'Invalid typeKey'));
+                $this->jsonError(404);
             }
             $operation = 'create';
         }
@@ -107,17 +107,13 @@ public function linkData(HTTPRequest $request): HTTPResponse
                 $data[$link->ID] = $this->getLinkData($link);
             }
         }
-
-        $response = $this->getResponse();
-        $response->addHeader('Content-type', 'application/json');
-        $response->setBody(json_encode($data));
-        return $response;
+        return $this->jsonSuccess(200, $data);
     }
 
     private function getLinkData(Link $link): array
     {
         if (!$link->canView()) {
-            $this->jsonError(403, _t(__CLASS__ . '.UNAUTHORIZED', 'Unauthorized'));
+            $this->jsonError(403);
         }
         $data = $link->jsonSerialize();
         $data['canDelete'] = $link->canDelete();
@@ -134,11 +130,11 @@ public function linkDelete(): HTTPResponse
     {
         $link = $this->linkFromRequest();
         if (!$link->canDelete()) {
-            $this->jsonError(403, _t(__CLASS__ . '.UNAUTHORIZED', 'Unauthorized'));
+            $this->jsonError(403);
         }
         // Check security token on destructive operation
         if (!SecurityToken::inst()->checkRequest($this->getRequest())) {
-            $this->jsonError(400, _t(__CLASS__ . '.INVALID_TOKEN', 'Invalid CSRF token'));
+            $this->jsonError(400);
         }
         // delete() will also delete any published version immediately
         $link->delete();
@@ -151,10 +147,7 @@ public function linkDelete(): HTTPResponse
             $owner->write();
         }
         // Send response
-        $response = $this->getResponse();
-        $response->addHeader('Content-type', 'application/json');
-        $response->setBody(json_encode(['success' => true]));
-        return $response;
+        return $this->jsonSuccess(201);
     }
 
     /**
@@ -174,9 +167,8 @@ public function getLinkForm(): Form
     public function save(array $data, Form $form): HTTPResponse
     {
         if (empty($data)) {
-            $this->jsonError(400, _t(__CLASS__ . '.EMPTY_DATA', 'Empty data'));
+            $this->jsonError(400);
         }
-
         /** @var Link $link */
         $id = $this->itemIDFromRequest();
         if ($id) {
@@ -184,10 +176,10 @@ public function save(array $data, Form $form): HTTPResponse
             $operation = 'edit';
             $link = Link::get()->byID($id);
             if (!$link) {
-                $this->jsonErorr(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+                $this->jsonError(404);
             }
             if (!$link->canEdit()) {
-                $this->jsonError(403, _t(__CLASS__ . '.UNAUTHORIZED', 'Unauthorized'));
+                $this->jsonError(403);
             }
         } else {
             // Creating a new Link
@@ -195,11 +187,11 @@ public function save(array $data, Form $form): HTTPResponse
             $typeKey = $this->typeKeyFromRequest();
             $className = LinkTypeService::create()->byKey($typeKey) ?? '';
             if (!$className) {
-                $this->jsonError(404, _t(__CLASS__ . '.INVALID_TYPEKEY', 'Invalid typeKey'));
+                $this->jsonError(404);
             }
             $link = $className::create();
             if (!$link->canCreate()) {
-                $this->jsonError(403, _t(__CLASS__ . '.UNAUTHORIZED', 'Unauthorized'));
+                $this->jsonError(403);
             }
         }
 
@@ -210,7 +202,7 @@ public function save(array $data, Form $form): HTTPResponse
         if ((isset($data['ID']) && ((int) $data['ID'] !== $id))
             || isset($data['Sort'])
         ) {
-            $this->jsonError(400, _t(__CLASS__ . '.BAD_DATA', 'Bad data'));
+            $this->jsonError(400);
         }
 
         // Update DataObject from form data
@@ -274,13 +266,13 @@ public function linkSort()
         $request = $this->getRequest();
         // Check security token
         if (!SecurityToken::inst()->checkRequest($request)) {
-            $this->jsonError(400, _t(__CLASS__ . '.INVALID_TOKEN', 'Invalid CSRF token'));
+            $this->jsonError(400);
         }
         $json = json_decode($request->getBody() ?? '');
         $newLinkIDs = $json?->newLinkIDs;
         // If someone's passing a JSON object or other non-array here, they're doing something wrong
         if (!is_array($newLinkIDs) || empty($newLinkIDs)) {
-            $this->jsonError(400, _t('LinkField.BAD_DATA', 'Bad data'));
+            $this->jsonError(400);
         }
         // Fetch and validate links
         $links = Link::get()->filter(['ID' => $newLinkIDs])->toArray();
@@ -295,7 +287,7 @@ public function linkSort()
                 $ownerRelation = $link->OwnerRelation;
             }
             if ($link->OwnerID !== $ownerID || $link->OwnerRelation !== $ownerRelation) {
-                $this->jsonError(400, _t('LinkField.BAD_DATA', 'Bad data'));
+                $this->jsonError(400);
             }
             $linkIDToLink[$link->ID] = $link;
         }
@@ -307,7 +299,7 @@ public function linkSort()
             // There's also corresponding logic in Link::onBeforeWrite() to also have a minimum of 1
             $sort = $i + 1;
             if ($link->Sort !== $sort && !$link->canEdit()) {
-                $this->jsonError(403, _t(__CLASS__ . '.UNAUTHORIZED', 'Unauthorized'));
+                $this->jsonError(403);
             }
         }
         // Update Sort field on links
@@ -321,10 +313,7 @@ public function linkSort()
             }
         }
         // Send response
-        $response = $this->getResponse();
-        $response->addHeader('Content-type', 'application/json');
-        $response->setBody(json_encode(['success' => true]));
-        return $response;
+        return $this->jsonSuccess(201);
     }
 
     /**
@@ -413,11 +402,11 @@ private function linkFromRequest(): Link
     {
         $itemID = $this->itemIDFromRequest();
         if (!$itemID) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+            $this->jsonError(404);
         }
         $link = Link::get()->byID($itemID);
         if (!$link) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+            $this->jsonError(404);
         }
         return $link;
     }
@@ -429,11 +418,11 @@ private function linksFromRequest(): DataList
     {
         $itemIDs = $this->itemIDsFromRequest();
         if (empty($itemIDs)) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+            $this->jsonError(404);
         }
         $links = Link::get()->byIDs($itemIDs);
         if (!$links->exists()) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+            $this->jsonError(404);
         }
         return $links;
     }
@@ -446,7 +435,7 @@ private function itemIDFromRequest(): int
         $request = $this->getRequest();
         $itemID = (string) $request->param('ItemID');
         if (!ctype_digit($itemID)) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+            $this->jsonError(404);
         }
         return (int) $itemID;
     }
@@ -460,13 +449,13 @@ private function itemIDsFromRequest(): array
         $itemIDs = $request->getVar('itemIDs');
 
         if (!is_array($itemIDs)) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+            $this->jsonError(404);
         }
 
         $idsAsInt = [];
         foreach ($itemIDs as $id) {
             if (!is_int($id) && !ctype_digit($id)) {
-                $this->jsonError(404, _t(__CLASS__ . '.INVALID_ID', 'Invalid ID'));
+                $this->jsonError(404);
             }
             $idsAsInt[] = (int) $id;
         }
@@ -482,7 +471,7 @@ private function typeKeyFromRequest(): string
         $request = $this->getRequest();
         $typeKey = (string) $request->getVar('typeKey');
         if (strlen($typeKey) === 0 || !preg_match('#^[a-z\-]+$#', $typeKey)) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_TYPEKEY', 'Invalid typeKey'));
+            $this->jsonError(404);
         }
         return $typeKey;
     }
@@ -495,7 +484,7 @@ private function getOwnerClassFromRequest(): string
         $request = $this->getRequest();
         $ownerClass = $request->getVar('ownerClass') ?: $request->postVar('OwnerClass');
         if (!is_a($ownerClass, DataObject::class, true)) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_OWNER_CLASS', 'Invalid ownerClass'));
+            $this->jsonError(404);
         }
 
         return $ownerClass;
@@ -509,7 +498,7 @@ private function getOwnerIDFromRequest(): int
         $request = $this->getRequest();
         $ownerID = (int) ($request->getVar('ownerID') ?: $request->postVar('OwnerID'));
         if ($ownerID === 0) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_OWNER_ID', 'Invalid ownerID'));
+            $this->jsonError(404);
         }
 
         return $ownerID;
@@ -546,7 +535,7 @@ private function getOwnerFromRequest(): DataObject
                 return $owner;
             }
         }
-        $this->jsonError(404, _t(__CLASS__ . '.INVALID_OWNER', 'Invalid Owner'));
+        $this->jsonError(404);
     }
 
     /**
@@ -558,7 +547,7 @@ private function getOwnerRelationFromRequest(): string
         $request = $this->getRequest();
         $ownerRelation = $request->getVar('ownerRelation') ?: $request->postVar('OwnerRelation');
         if (!$ownerRelation) {
-            $this->jsonError(404, _t(__CLASS__ . '.INVALID_OWNER_RELATION', 'Invalid ownerRelation'));
+            $this->jsonError(404);
         }
 
         return $ownerRelation;
diff --git a/tests/php/Controllers/LinkFieldControllerTest.php b/tests/php/Controllers/LinkFieldControllerTest.php
index 18d55a96..08efa606 100644
--- a/tests/php/Controllers/LinkFieldControllerTest.php
+++ b/tests/php/Controllers/LinkFieldControllerTest.php
@@ -55,8 +55,7 @@ public function testLinkFormGetSchema(
         string $typeKey,
         string $fail,
         int $expectedCode,
-        ?string $expectedValue,
-        string $expectedMessage
+        ?string $expectedValue
     ): void {
         TestPhoneLink::$fail = $fail;
         $owner = $this->getFixtureLinkOwner();
@@ -75,10 +74,7 @@ public function testLinkFormGetSchema(
         $response = $this->get($url, null, $headers);
         $this->assertSame('application/json', $response->getHeader('Content-type'));
         $this->assertSame($expectedCode, $response->getStatusCode());
-        if ($expectedCode !== 200) {
-            $jsonError = json_decode($response->getBody(), true);
-            $this->assertSame($expectedMessage, $jsonError['errors'][0]['value']);
-        } else {
+        if ($expectedCode === 200) {
             $formSchema = json_decode($response->getBody(), true);
             $this->assertSame("admin/linkfield/schema/linkForm/$id", $formSchema['id']);
             $expectedAction = "admin/linkfield/linkForm/$id?typeKey=testphone&ownerID=$ownerID&ownerClass=$ownerClass"
@@ -114,7 +110,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => '',
                 'expectedCode' => 200,
                 'expectedValue' => '0123456789',
-                'expectedMessage' => '',
             ],
             'Valid new record' => [
                 'idType' => 'new-record',
@@ -122,7 +117,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => '',
                 'expectedCode' => 200,
                 'expectedValue' => null,
-                'expectedMessage' => '',
             ],
             'Reject invalid ID' => [
                 'idType' => 'invalid',
@@ -130,7 +124,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => '',
                 'expectedCode' => 404,
                 'expectedValue' => null,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject missing ID' => [
                 'idType' => 'missing',
@@ -138,7 +131,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => '',
                 'expectedCode' => 404,
                 'expectedValue' => null,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject non-numeric ID' => [
                 'idType' => 'non-numeric',
@@ -146,7 +138,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => '',
                 'expectedCode' => 404,
                 'expectedValue' => null,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject invalid typeKey for new record' => [
                 'idType' => 'new-record',
@@ -154,7 +145,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => '',
                 'expectedCode' => 404,
                 'expectedValue' => null,
-                'expectedMessage' => 'Invalid typeKey',
             ],
             'Reject fail canView() check' => [
                 'idType' => 'existing',
@@ -162,7 +152,6 @@ public function provideLinkFormGetSchema(): array
                 'fail' => 'can-view',
                 'expectedCode' => 403,
                 'expectedValue' => null,
-                'expectedMessage' => 'Unauthorized',
             ],
         ];
     }
@@ -176,7 +165,6 @@ public function testLinkFormPost(
         string $dataType,
         string $fail,
         int $expectedCode,
-        string $expectedMessage,
         string $expectedLinkType
     ): void {
         TestPhoneLink::$fail = $fail;
@@ -215,11 +203,9 @@ public function testLinkFormPost(
             $this->assertStringContainsString('Silverstripe - Bad Request', $response->getBody());
             return;
         }
+        $this->assertSame($expectedCode, $response->getStatusCode());
         $this->assertSame('application/json', $response->getHeader('Content-type'));
-        if ($expectedCode !== 200) {
-            $jsonError = json_decode($response->getBody(), true);
-            $this->assertSame($expectedMessage, $jsonError['errors'][0]['value']);
-        } else {
+        if ($expectedCode === 200) {
             $formSchema = json_decode($response->getBody(), true);
             $newID = $this->getIDAfterPost($expectedLinkType);
             if ($expectedLinkType === 'new-record') {
@@ -243,7 +229,6 @@ public function testLinkFormPost(
             // state node is flattened, unlike schema node
             $this->assertSame('9876543210', $formSchema['state']['fields'][3]['value']);
             if ($fail) {
-                $this->assertSame($expectedMessage, $formSchema['errors'][0]['value']);
                 // Phone was note updated on PhoneLink dataobject
                 $link = TestPhoneLink::get()->byID($newID);
                 $this->assertSame($link->Phone, '0123456789');
@@ -279,7 +264,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => '',
                 'expectedCode' => 200,
-                'expectedMessage' => '',
                 'expectedLinkType' => 'existing',
             ],
             'Valid create new record' => [
@@ -288,7 +272,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => '',
                 'expectedCode' => 200,
-                'expectedMessage' => '',
                 'expectedLinkType' => 'new-record',
             ],
             'Invalid validate()' => [
@@ -297,7 +280,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => 'validate',
                 'expectedCode' => 200,
-                'expectedMessage' => 'Fail was validate',
                 'expectedLinkType' => 'existing',
             ],
             'Invalid getCMSCompositeValidator()' => [
@@ -306,7 +288,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => 'cms-composite-validator',
                 'expectedCode' => 200,
-                'expectedMessage' => 'Fail was cms-composite-validator',
                 'expectedLinkType' => 'existing',
             ],
             'Reject invalid ID' => [
@@ -315,7 +296,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
                 'expectedLinkType' => '',
             ],
             'Reject missing ID' => [
@@ -324,7 +304,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
                 'expectedLinkType' => '',
             ],
             'Reject non-numeric ID' => [
@@ -333,7 +312,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
                 'expectedLinkType' => '',
             ],
             'Reject invalid typeKey for new record' => [
@@ -342,7 +320,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid typeKey',
                 'expectedLinkType' => '',
             ],
             'Reject empty data' => [
@@ -351,7 +328,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'empty',
                 'fail' => '',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Empty data',
                 'expectedLinkType' => '',
             ],
             'Reject invalid-id data' => [
@@ -360,7 +336,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'invalid-id',
                 'fail' => '',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Bad data',
                 'expectedLinkType' => '',
             ],
             'Reject fail csrf-token' => [
@@ -369,7 +344,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => 'csrf-token',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Invalid CSRF token',
                 'expectedLinkType' => '',
             ],
             'Reject fail canEdit() check existing record' => [
@@ -378,7 +352,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => 'can-edit',
                 'expectedCode' => 403,
-                'expectedMessage' => 'Unauthorized',
                 'expectedLinkType' => '',
             ],
             'Reject fail canCreate() check new record' => [
@@ -387,7 +360,6 @@ public function provideLinkFormPost(): array
                 'dataType' => 'valid',
                 'fail' => 'can-create',
                 'expectedCode' => 403,
-                'expectedMessage' => 'Unauthorized',
                 'expectedLinkType' => '',
             ],
         ];
@@ -446,7 +418,6 @@ public function provideLinkFormReadOnly(): array
     public function testLinkData(
         string $idType,
         int $expectedCode,
-        string $expectedMessage,
     ): void {
         $id = $this->getID($idType);
         if ($id === -1) {
@@ -457,10 +428,7 @@ public function testLinkData(
         $response = $this->get($url);
         $this->assertSame('application/json', $response->getHeader('Content-type'));
         $this->assertSame($expectedCode, $response->getStatusCode());
-        if ($expectedCode !== 200) {
-            $jsonError = json_decode($response->getBody(), true);
-            $this->assertSame($expectedMessage, $jsonError['errors'][0]['value']);
-        } else {
+        if ($expectedCode === 200) {
             $data = json_decode($response->getBody(), true);
             $this->assertSame($id, $data['ID']);
             $this->assertSame('0123456789', $data['Phone']);
@@ -475,27 +443,22 @@ public function provideLinkData(): array
             'Valid' => [
                 'idType' => 'existing',
                 'expectedCode' => 200,
-                'expectedMessage' => '',
             ],
             'Reject invalid ID' => [
                 'idType' => 'invalid',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject missing ID' => [
                 'idType' => 'missing',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject non-numeric ID' => [
                 'idType' => 'non-numeric',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject new record ID' => [
                 'idType' => 'new-record',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
         ];
     }
@@ -506,8 +469,7 @@ public function provideLinkData(): array
     public function testLinkDelete(
         string $idType,
         string $fail,
-        int $expectedCode,
-        string $expectedMessage
+        int $expectedCode
     ): void {
         TestPhoneLink::$fail = $fail;
         $owner = $this->getFixtureLinkOwner();
@@ -529,9 +491,7 @@ public function testLinkDelete(
         $response = $this->mainSession->sendRequest('DELETE', $url, [], $headers);
         $this->assertSame('application/json', $response->getHeader('Content-type'));
         $this->assertSame($expectedCode, $response->getStatusCode());
-        if ($expectedCode !== 200) {
-            $jsonError = json_decode($response->getBody(), true);
-            $this->assertSame($expectedMessage, $jsonError['errors'][0]['value']);
+        if ($expectedCode >= 400) {
             $this->assertNotNull(TestPhoneLink::get()->byID($fixtureID));
             $owner = $this->getFixtureLinkOwner();
             $this->assertSame($ownerLinkID, $owner->LinkID);
@@ -549,44 +509,37 @@ public function provideLinkDelete(): array
             'Valid' => [
                 'idType' => 'existing',
                 'fail' => '',
-                'expectedCode' => 200,
-                'expectedMessage' => '',
+                'expectedCode' => 201,
             ],
             'Reject fail canDelete()' => [
                 'idType' => 'existing',
                 'fail' => 'can-delete',
                 'expectedCode' => 403,
-                'expectedMessage' => 'Unauthorized',
             ],
             'Reject fail csrf-token' => [
                 'idType' => 'existing',
                 'fail' => 'csrf-token',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Invalid CSRF token',
             ],
             'Reject invalid ID' => [
                 'idType' => 'invalid',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject missing ID' => [
                 'idType' => 'missing',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject non-numeric ID' => [
                 'idType' => 'non-numeric',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
             'Reject new record ID' => [
                 'idType' => 'new-record',
                 'fail' => '',
                 'expectedCode' => 404,
-                'expectedMessage' => 'Invalid ID',
             ],
         ];
     }
@@ -598,7 +551,6 @@ public function testLinkSort(
         array $newTitleOrder,
         string $fail,
         int $expectedCode,
-        string $expectedMessage,
         array $expectedTitles
     ): void {
         TestPhoneLink::$fail = $fail;
@@ -622,10 +574,6 @@ public function testLinkSort(
         }
         $response = $this->post($url, null, $headers, null, $body);
         $this->assertSame($expectedCode, $response->getStatusCode());
-        if ($expectedCode !== 200) {
-            $jsonError = json_decode($response->getBody(), true);
-            $this->assertSame($expectedMessage, $jsonError['errors'][0]['value']);
-        }
         $this->assertSame(
             $this->getExpectedTitles($expectedTitles),
             TestPhoneLink::get()->filter(['OwnerRelation' => 'LinkList'])->column('Title')
@@ -638,50 +586,43 @@ public function provideLinkSort(): array
             'Success' => [
                 'newTitleOrder' => [4, 2, 3],
                 'fail' => '',
-                'expectedCode' => 200,
-                'expectedMessage' => '',
+                'expectedCode' => 201,
                 'expectedTitles' => [4, 2, 3],
             ],
             'Emtpy data' => [
                 'newTitleOrder' => [],
                 'fail' => '',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Bad data',
                 'expectedTitles' => [2, 3, 4],
             ],
             'Fail can edit' => [
                 'newTitleOrder' => [4, 2, 3],
                 'fail' => 'can-edit',
                 'expectedCode' => 403,
-                'expectedMessage' => 'Unauthorized',
                 'expectedTitles' => [2, 3, 4],
             ],
             'Fail object data' => [
                 'newTitleOrder' => [],
                 'fail' => 'object-data',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Bad data',
                 'expectedTitles' => [2, 3, 4],
             ],
             'Fail csrf token' => [
                 'newTitleOrder' => [4, 2, 3],
                 'fail' => 'csrf-token',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Invalid CSRF token',
                 'expectedTitles' => [2, 3, 4],
             ],
             'Mismatched owner' => [
                 'newTitleOrder' => [4, 1, 2],
                 'fail' => '',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Bad data',
                 'expectedTitles' => [2, 3, 4],
             ],
             'Mismatched owner relation' => [
                 'newTitleOrder' => [4, 5, 2],
                 'fail' => '',
                 'expectedCode' => 400,
-                'expectedMessage' => 'Bad data',
                 'expectedTitles' => [2, 3, 4],
             ],
         ];