1 exception(s): Exception #0 (Zend_Json_Exception): Decoding failed: Syntax error Exception #0 (Zend_Json_Exception): Decoding failed: Syntax error#0 /var/www/html/magento2/vendor/magento/framework/Json/Decoder.php(20): Zend_Json::decode(”) #1 var/www/html/magento2/vendor/magento/framework/Json/Helper/Data.php(58): Magento\Framework\Json\Decoder->decode(false)

In my custom mdoule I am creating a slider by fetching data form API.

IN /var/www/html/magento2/app/code/Custommodule/ReviewRating/Block/HomehorizontalWidget.php

<?php namespace Custommodule\ReviewRating\Block;  class HomehorizontalWidget extends \Magento\Framework\View\Element\Template { protected $  _helper; protected $  jsonHelper;   public function __construct(     \Magento\Framework\View\Element\Template\Context $  context,     array $  data = [],     \Custommodule\ReviewRating\Helper\Data $  helper,     \Magento\Framework\Json\Helper\Data $  jsonHelper ) {     parent::__construct($  context, $  data);      $  this->_helper = $  helper;     $  this->jsonHelper = $  jsonHelper; }    .................   public function get_reviews_data( $  url ){         $  dataResponse = $  this->getDataFromApi($  url);         return $  dataResponse['data']['reviews'];  }      public function getDataFromApi($  url)     {          $  ch = curl_init();         curl_setopt($  ch, CURLOPT_URL, $  url);         curl_setopt($  ch, CURLOPT_RETURNTRANSFER, 1);         curl_setopt($  ch, CURLOPT_CONNECTTIMEOUT, 5);         curl_setopt($  ch, CURLOPT_TIMEOUT, 5);         $  data = curl_exec($  ch);         $  httpcode = curl_getinfo($  ch, CURLINFO_HTTP_CODE);         curl_close($  ch);         $  decodedData = $  this->jsonHelper->jsonDecode($  data);          return ($  httpcode>=200 && $  httpcode<300) ? $  decodedData : false;      } 

IN /var/www/html/magento2/app/code/Custommodule/ReviewRating/view/frontend/templates/homehorizontalwidget.phtml

    $  url = "http://website.com/api?url";         $  reviewsData = $  this->get_reviews_data( $  url );        echo "<pre>";        print_r( $  reviewsData );        echo "</pre>"; ?>