In Laravel, when calling APIs using JWT or Sanctum, you should handle exceptions to return JSON responses to the client. Otherwise, Laravel may return an HTML response.
<pre><code class="language-php">&lt;?php

namespace App\Exceptions;

use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Throwable;
use Illuminate\Auth\AuthenticationException;
class Handler extends ExceptionHandler
{
 /**
 * The list of the inputs that are never flashed to the session on validation exceptions.
 *
 * @var array&lt;int, string&gt;
 */
 protected $dontFlash = [
 &#x27;current_password&#x27;,
 &#x27;password&#x27;,
 &#x27;password_confirmation&#x27;,
 ];

 /**
 * Register the exception handling callbacks for the application.
 */
 public function register(): void
 {
 $this-&gt;reportable(function (Throwable $e) {
 //
 });
 }
 protected function unauthenticated($request, AuthenticationException $exception)
 {
 if ($request-&gt;expectsJson() || $request-&gt;is(&#x27;api/*&#x27;)) {
 return response()-&gt;json([
 &#x27;message&#x27; =&gt; &#x27;Bạn cần đăng nhập&#x27;
 ], 401);
 }

 return redirect()-&gt;guest(route(&#x27;login&#x27;));
 }
}

</code></pre>

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How to Handle Exceptions and Return JSON in Laravel APIs