Drupal 7 tattoo module adds to `Drupal.settings` object the whole JSON representation of all viewed entities.

tattoo.info

name = Tattoo
core = 7.x
dependencies[] = restws

tattoo.module

<?php

/**
 * Implements hook_entity_view().
 */
function tattoo_entity_view($entity, $type, $view_mode, $langcode) {
  $tattooed = &drupal_static(__FUNCTION__, array());
  if (!isset($tattooed[$type])) {
    $tattooed[$type] = array();
  }

  list($id) = entity_extract_ids($type, $entity);

  // Don't tattoo an entity's JSON representation more than once.
  if (in_array($id, $tattooed[$type])) {
    return;
  }

  // Use RESTWS module to generate an array representation of the entity.
  $resourceController = restws_resource_controller($type);
  $format = restws_format('json');
  $json = $format->viewResource($resourceController, $id);

  // Embed that entity's JSON in Drupal's global JS settings object.
  $data = array(
    'entity' => array(
      $type => array(
        $id => json_decode($json, TRUE)
      )
    )
  );
  drupal_add_js($data, 'setting');
  $tattooed[$type][] = $id;
}