laravel captcha cannot validate

Go over everything in 3. Validate the CAPTCHA In Your Laravel Controller on their site, you may have missed a small detail, or have a typo.
https://captcha.com/doc/php/howto/laravel-captcha.html

Only a little different. I create a LoginForm Request instead validate captcha in Controller In my LoginForm class, i use "valid_captcha" rule for "CaptchaCode"

When i debug: Log::info(($captcha->Validate($value))? "captcha true": "captcha false"); I see it return "captcha true". But on website, it still display invalid message: "CAPTCHA validation failed, please try again."

Do you think It may not work with Form validation ? I will try to validate in Controller again

You can try https://github.com/anam-hossain/captcha. This package is support both reCAPTCHA V2 and Invisible reCAPTCHA. This package is only developed for Laravel users.

You should get rid of that old bulky package. All you have to do is activate the service with Google and place this in you form:

<div class="g-recaptcha" data-sitekey="{{ env('RECAPTCHA_SITE') }}"></div>

Then in your controller:

<?php

namespace App\Http\Controllers;

use App\Mail\ContactEmail;
use App\Utilities\Curl;
use Mail;
use Illuminate\Http\Request;

class ContactController extends Controller
{
    public function contact() {
        return view('pages.contact');
    }

    /**
     * @param \Illuminate\Http\Request $request
     * @param \App\Utilities\Curl      $curl
     *
     * @return $this|\Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
     */
    public function send(Request $request, Curl $curl) {
        // Validate request
        $response = json_decode(
            $curl->post('https://www.google.com/recaptcha/api/siteverify', [
                'secret'   => config('services.recaptcha.secret'),
                'response' => $request->input('g-recaptcha-response'),
                'remoteip' => $request->ip(),
            ])
        );

        $this->validate($request, [
            'my_name' => 'required|min:2',
            'email' => 'required|email',
            'subject' => 'required|max:255',
            'message_text' => 'required|min:5'
        ]);

        if (!$response->success) {
            flash('Try again to prove you are a human!');
            flash_level('warning');
            return redirect('/contact')->withInput();
        }

        $data = $request->all();

        Mail::to('[email protected]')->send(new ContactEmail($data));

        flash('Your email has been sent!');
        flash_level('success');

        return redirect('/contact');
    }
}

That should get you started.

Thanks, @ejdelmonico

With Laravel 5.2 and Guzzle, here is what worked for me.

<?php

namespace App\Http\Controllers;

use GuzzleHttp;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Mail;

class ContactController extends Controller
{
    public function showForm()
    {
        return view('pages.contact');
    }

    public function sendContactInfo(Request $request)
    {
        $client = new \GuzzleHttp\Client();

        $response = $client->request(
            'POST',
            'https://www.google.com/recaptcha/api/siteverify',
            [
                'form_params' => [
                    'secret'   => env('RECAPTCHA_SECRET'),
                    'response' => $request->input('g-recaptcha-response'),
                    'remoteip' => $request->ip(),
                ]
            ]
        );

        $response_json = json_decode($response->getBody());

        if ($response_json->success !== true) {
            $request->session()->flash('warning', 'Try again to prove you are a human!');
            return redirect()
              ->back()
              ->withInput();
        }

        $this->validate($request, [
            'contactName'    => 'required|min:5',
            'contactEmail'   => 'required|email',
            'contactSubject' => 'required|min:4',
            'contactMessage' => 'required|min:10'
        ]);

        $data = $request->only('contactName', 'contactEmail', 'contactSubject', 'contactMessage');

        Mail::send('emails.contact', $data, function ($message) use ($data) {
            $dev = \App::environment('dev') ? '[dev] ' : '';
            $message->subject($dev.'Contact Us: '.$data['contactSubject'])
                    ->to('[email protected]')
                    ->replyTo($data['contactEmail']);
        });

        return back()->withSuccess(
          "Thank you for contacting us! We will be in touch shortly!"
        );
    }
}