To display a list of available tokens in your module or code, use the following examples.

Drupal 8

In a form:

 $form['tokens'] = \Drupal::service('token.tree_builder')->buildRenderable(['node', 'user']);
 // Pass your entity machine name as parameter in an array to add it to the list.
);

Drupal 7

In a form:

$form['tokens'] = array(
  '#theme' => 'token_tree_link',
  // To get these options to work, use the patch from https://www.drupal.org/node/2289203 if you have Token 7.x-1.5 or earlier.
  '#token_types' => array('node'), // The token types that have specific context. Can be multiple token types like 'term' and/or 'user'
  '#global_types' => TRUE, // A boolean TRUE or FALSE whether to include 'global' context tokens like [current-user:*] or [site:*]. Defaults to TRUE.
  '#click_insert' => TRUE, // A boolean whether to include the 'Click this token to insert in into the the focused textfield' JavaScript functionality. Defaults to TRUE.
);

In a render array:

$form['tokens'] = array(
  '#theme' => 'token_tree',
  '#token_types' => array('node'),
  '#global_types' => FALSE,
  '#click_insert' => FALSE,
);

Drupal 6

The parameters to theme('token_tree') are the following in order:

• The array of token types to display.
• A boolean to allow the global token types (defaults to TRUE).
• A boolean to allow the click-insert JavaScript functionality (defaults to TRUE).

In a form:

$form['tokens'] = array(
  '#value' => theme('token_tree', array('node'), TRUE, TRUE),
);

In a page output:

$output = ...
$output .= '<h4>Available tokens:</h4>';
$output .= theme('token_tree', array('node'), TRUE, TRUE);
return $output;