How to create a REST endpoint with Drupal 8?

Drupal is a free, open-source web content management system and is implemented in PHP. The platform can be extended by writing plugins for the platform in PHP. The problem with server side rendered applications is that if you want to navigate to another side the application has to do a backend call. With client side rendering we just need to get the data from the server which is needed for the rendering. The goal is to create a REST endpoint which can be consumed by frontend frameworks
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Definition of a REST endpoint in Drupal 8

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How to create a REST endpoint with Drupal 8?

There is not so much information about implementing a REST endpoint in Drupal 8 - you can find a lot of information about creating an endpoint for a GET Request but little information about the other HTTP request methods (POST/PUT/DELETE). Before implementing a REST endpoint there are some prerequisites. You have to install the following modules: REST UI, RESTful Web Services, Serialization and Entity. After installing them you are ready to go.
First of all you need an entity for which u create the endpoint (you can take an already existing one like Node or you can create a new one - a new one has to be created under the module path ‘src\Entity\.php’). With this entity you get some nice functions like storing, updating, deleting etc. . Now you can create your REST endpoint. The endpoint has to be created under the path ‘src\Plugin\rest\resource\’. The endpoint has to contain a header:
* Provides a resource to get view modes by entity and bundle.
* @RestResource(
* id = "",
* label = @Translation(""),
* serialization_class = "",
* uri_paths = {
* "canonical" = "/{id}",
* "" = ""
* }
* )
Now you just have to implement the following methods:
public function get($id){return Symfony\Component\HttpFoundation\Response}
public function put($id, $data){return Symfony\Component\HttpFoundation\Response}
public function post($node_type, $data){return Symfony\Component\HttpFoundation\Response}
public function delete($id){return Symfony\Component\HttpFoundation\Response}
The last thing is the definition of the access methods - this can be done under /admin/config/services/rest of your Drupal installation. You can find your request methods with the label you gave in the header.

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