JsonTableFormatter.php

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<?php
 
namespace Drupal\json_schema_field\Plugin\Field\FieldFormatter;
 
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\Field\FieldItemListInterface;
 
class JsonTableFormatter extends FormatterBase {
 
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
 
    foreach ($items as $delta => $item) {
      $metadata = (array) json_decode($item->value);
 
      $elements[$delta] = [
        '#type' => 'table',
      ];
      foreach ($metadata as $key => $value) {
        $elements[$delta]['#rows'][] = ['key' => $key, 'value' => (string) $value];
      }
    }
    return $elements;
  }
 
}