[10.x] backport #52188

src/Illuminate/Database/Eloquent/Model.php

@@ -20,6 +20,7 @@
 use Illuminate\Support\Collection as BaseCollection;
 use Illuminate\Support\Str;
 use Illuminate\Support\Traits\ForwardsCalls;
+use JsonException;
 use JsonSerializable;
 use LogicException;
 
@@ -1646,10 +1647,10 @@ public function toArray()
      */
     public function toJson($options = 0)
     {
-        $json = json_encode($this->jsonSerialize(), $options);
-
-        if (json_last_error() !== JSON_ERROR_NONE) {
-            throw JsonEncodingException::forModel($this, json_last_error_msg());
+        try {
+            $json = json_encode($this->jsonSerialize(), $options | JSON_THROW_ON_ERROR);
+        } catch (JsonException $e) {
+            throw JsonEncodingException::forModel($this, $e->getMessage());
         }
 
         return $json;

src/Illuminate/Http/Resources/Json/JsonResource.php

@@ -12,6 +12,7 @@
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\ConditionallyLoadsAttributes;
 use Illuminate\Http\Resources\DelegatesToResource;
+use JsonException;
 use JsonSerializable;
 
 class JsonResource implements ArrayAccess, JsonSerializable, Responsable, UrlRoutable
@@ -144,10 +145,10 @@ public function toArray(Request $request)
      */
     public function toJson($options = 0)
     {
-        $json = json_encode($this->jsonSerialize(), $options);
-
-        if (json_last_error() !== JSON_ERROR_NONE) {
-            throw JsonEncodingException::forResource($this, json_last_error_msg());
+        try {
+            $json = json_encode($this->jsonSerialize(), $options | JSON_THROW_ON_ERROR);
+        } catch (JsonException $e) {
+            throw JsonEncodingException::forResource($this, $e->getMessage());
         }
 
         return $json;

tests/Database/DatabaseEloquentModelTest.php

@@ -2860,6 +2860,17 @@ public function testDiscardChanges()
         $this->assertNull($user->getOriginal('name'));
         $this->assertNull($user->getAttribute('name'));
     }
+
+    public function testModelToJsonSucceedsWithPriorErrors(): void
+    {
+        $user = new EloquentModelStub(['name' => 'Mateus']);
+
+        // Simulate a JSON error
+        json_decode('{');
+        $this->assertTrue(json_last_error() !== JSON_ERROR_NONE);
+
+        $this->assertSame('{"name":"Mateus"}', $user->toJson(JSON_THROW_ON_ERROR));
+    }
 }
 
 class EloquentTestObserverStub

tests/Http/JsonResourceTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Illuminate\Tests\Http;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Http\Resources\Json\JsonResource;
+use Mockery as m;
+use PHPUnit\Framework\TestCase;
+
+class JsonResourceTest extends TestCase
+{
+    public function testJsonResourceToJsonSucceedsWithPriorErrors(): void
+    {
+        $model = new class extends Model {};
+
+        $resource = m::mock(JsonResource::class, ['resource' => $model])
+            ->makePartial()
+            ->shouldReceive('jsonSerialize')->once()->andReturn(['foo' => 'bar'])
+            ->getMock();
+
+        // Simulate a JSON error
+        json_decode('{');
+        $this->assertTrue(json_last_error() !== JSON_ERROR_NONE);
+
+        $this->assertSame('{"foo":"bar"}', $resource->toJson(JSON_THROW_ON_ERROR));
+    }
+}