get wordpress categories list from custom query

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I am writing a web service and I need to fetch list of all categories of WordPress in JSON response. Has somebody already done this? Please share the solution.

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  1. Here is the function of all categories list in json format. I hope it will be work.Please try this :- 

    <?php 
        function get_all_categories(){
            $args = array(
            'type'                     => 'post',
            'child_of'                 => 0,
            'parent'                   => '',
            'orderby'                  => 'name',
            'order'                    => 'ASC',
            'hide_empty'               => 1,
            'hierarchical'             => 1,
            'exclude'                  => '',
            'include'                  => '',
            'number'                   => '',
            'taxonomy'                 => 'category',
            'pad_counts'               => false 

        ); 


            $categories = get_categories( $args );
            return json_encode($categories));
      }
    ?>

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