Drupal - Get path alias from NID (or node object)

To get the path for a node id use AliasManager::getAliasByPath:

Drupal 8

$alias = \Drupal::service('path.alias_manager')->getAliasByPath('/node/'.$nid);

As per the new change record in Drupal 8.8.0 and above path.alias_manager is deprecated and path_alias.manager is introduced.

New syntax is as follows :

$url_alias = \Drupal::service('path_alias.manager')->getAliasByPath('/node/'. $nid, $langcode);

What about using Url:

use Drupal\Core\Url;    

...

$url = Url::fromRoute('entity.node.canonical', ['node' => $nid])->toString();

If you only have the nid, 4k4's solution of

$alias = \Drupal::service('path.alias_manager')->getAliasByPath('/node/'.$nid);

Works great. But if you already have a node object you can skip a step or two. Nodes actually have built in methods for getting urls.

$node->toUrl()->toString();

Would return the aliased url of the node.

toUrl() returns a url object. See here https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Url.php/class/Url/8.2.x

and toString() is a method of the url object that returns the string representation of the url.

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