designtopack/public/site/templates/projects.json.php

<?php
function getProjectData($project) {
    return [
    'title' => $project->title()->value(),
    'url' => $project->url(),
    'uri' => '/' . $project->uri(),
    'modified' => $project->modified('Y-MM-d'),
    'currentStep' => $project->currentStep()->value(),
    'status' => $project->status(),
    'logo' => $project->client()->toPage() ? $project->client()->toPage()->logo()->toFile()->url() : '',
    'steps' => $project->getSteps(),
    "uuid" => (string) $project->uuid()
  ];
}

try {
  $children = $kirby->user()->role() == 'admin' ? $page->children()->map(fn($project) => getProjectData($project))->values() : $kirby->user()->projects()->toPages()->map(fn($project) => getProjectData($project))->values();
} catch (\Throwable $th) {
  throw new Exception($th->getMessage() . ' line ' . $th->getLine(), 1);
  $children = [];
}

$specificData = [
  "children" => $children,
];

$pageData = array_merge($genericData, $specificData);

echo json_encode([
  "page" => $pageData,
  "user" => $userData
]);