datatable.directory/app/Tables/JsonExporter.php

<?php


namespace App\Tables;


class JsonExporter extends BaseExporter
{
    private $fullJsDoc = false;

    public function withJsWrapper()
    {
        $this->fullJsDoc = true;
        return $this;
    }

    /**
     * @return string - mime type for the downloaded file
     */
    protected function getMimeType()
    {
        return $this->fullJsDoc ? 'application/javascript' : 'application/json';
    }

    /**
     * @return string - file extension for the downloaded file
     */
    protected function getFileExtension()
    {
        return 'json';
    }

    /**
     * Write the document to stdout ('php://output')
     */
    protected function writeDocument()
    {
        if ($this->fullJsDoc) {
            echo "/*\n" . $this->getHeaderComment(' ') . "*/\n\n";

            echo 'module.exports = ';
        }

        echo "[\n";

        $first = true;
        foreach ($this->iterateRows() as $row) {
            if ($first) {
                $first = false;
            } else {
                echo ",\n";
            }
            echo '  '.json_encode($row, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
        }

        echo "\n]\n";
    }
}