Custom WordPress REST API

Currently, I am using wpdb plugin boilerplate. For this quick experiment, I create a plugin name with code

  1. Open /includes/class-code.php. Add function mrinal_information() with rest_api_init action hook. mrinal_information() will develop at /admin/class-code-admin.php
$this->loader->add_action( 'rest_api_init', $plugin_admin, 'mrinal_information' );

2. Open /admin/class-code-admin.php. Develop mrinal_information() in Code_Admin class.
In mrinal_information(), register endpoint with register_rest_route() with
a. Endpoint namespace
b. Route’s name
c. Array of methods and callback. As callback, we will declare information_function().
Finally, mrinal_information() will be,

public function mrinal_information() {
			'methods'  => 'GET',
			'callback' => array( $this, 'information_function' ),

3. For the experiment, in information_function(), I declare the name and URL of my photo. Information stored as Object. In this object, I will insert data. Finally, I returned this object at this defined endpoint.
Lastly, information_function() will be,

public function information_function() {
	$info = new stdClass();
	$info->name = "Mrinal";
	$info->cover = "http://localhost/rest/wp-content/uploads/2019/10/africa-1854308_1920.jpg";
	return $info;

 I can test this JSON is published at http://your.domain/rest/wp-json/mrinal/v1/information. Screenshot of result is

Final result

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