how i get the json body in controller in magento 2?

Question

    <?php
 namespace VEndor\Module\Controller\Index;
class Index extends \Magento\Framework\App\Action\Action
    {    protected $resultPageFactory;    public function __construct(
           \Magento\Framework\App\Action\Context $context,
           \Magento\Framework\View\Result\PageFactory $resultPageFactory)
       {
           $this->resultPageFactory = $resultPageFactory;
           parent::__construct($context);
       }    public function execute()    {                                $curl = curl_init();
                                    // Set some options - we are passing in a useragent too here
                                        curl_setopt_array($curl, array(
                                    CURLOPT_RETURNTRANSFER => 1,
                                    CURLOPT_URL => 'http://tgrestcURL.com/?item1=value&item2=value2',
                                    CURLOPT_USERAGENT => 'Codular Sample cURL Request'
                                ));
                                // Send the request & save response to $resp
                                $resp = curl_exec($curl);
                                // Close request to clear up some resources
                                curl_close($curl);
       }
    }

Answer 1

Once you've compiled PHP with cURL support, you can begin using the cURL functions. The basic idea behind the cURL functions is that you initialize a cURL session using the curl_init(), then you can set all your options for the transfer via the curl_setopt(), then you can execute the session with the curl_exec() and then you finish off your session using the curl_close(). Here is an example that uses the cURL functions to fetch the example.com homepage into a file

we can use CURL functionality in magento like we use in php.write below code in magento controller and set the required options in CURL as your API requires.

/ Get cURL resource
$curl = curl_init();
// Set some options - we are passing in a useragent too here
curl_setopt_array($curl, array(
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_URL => 'http://testcURL.com/?item1=value&item2=value2',
    CURLOPT_USERAGENT => 'Codular Sample cURL Request'
));
// Send the request & save response to $resp
$resp = curl_exec($curl);
// Close request to clear up some resources
curl_close($curl);

Answer 2

Inject json factory class:

\Magento\Framework\Controller\Result\JsonFactory to __construct function

On convert resp is to array from Json if $resp is json variable .

=====================================

<?php
namespace VEndor\Module\Controller\Index;
class Index extends \Magento\Framework\App\Action\Action
{
    protected $resultPageFactory;
    protected $jsonFactory;    
    public function __construct(
            \Magento\Framework\App\Action\Context $context, 
            \Magento\Framework\View\Result\PageFactory $resultPageFactory,
            \Magento\Framework\Controller\Result\JsonFactory $jsonFactory
            )
    {
        $this->resultPageFactory = $resultPageFactory;
        $this->jsonFactory = $jsonFactory;       
        parent::__construct($context);
    }
    public function execute()
    {
        $jsonFactory =  $this->jsonFactory->create();
        $curl = curl_init();
        // Set some options - we are passing in a useragent too here
        curl_setopt_array($curl, array(
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_URL => 'http://tgrestcURL.com/?item1=value&item2=value2',
            CURLOPT_USERAGENT => 'Codular Sample cURL Request'
        ));
        // Send the request & save response to $resp
        $resp = curl_exec($curl);
        // Close request to clear up some resources
        curl_close($curl);
    }
    /* to Convert JSON to array */
    $resp = json_decode($resp);
    return $jsonFactory->setData($finalrespose);
}