WP REST Registration

composer require evo-mark/evo-wp-rest-registration 

{
	"autoload": {
		"psr-4": {
			"MyPluginNamespace\\": "src/"
		}
	}
}

<?php

require_once "vendor/autoload.php";

<?php


use EvoWpRestRegistration\RestApi;


new RestApi([
    'namespace' => 'MyPlugin\\RestApi\\',
    'version' => 1,
    'directory' => __DIR__ . '/src/RestApi',
    'base_url' => 'my-plugin'
]);

1<?php
2namespace MyPlugin\RestApi;
3
4use WP_REST_Request;
5use EvoWpRestRegistration\BaseRestController;
6
7defined('ABSPATH') or exit;
8
9class PingGet extends BaseRestController
10{
11    protected $path = 'ping';
12    protected $methods = 'GET';
13	// From ^3.0.0 endpoints must opt-in to be shown in the REST index at /wp-json
14    protected bool $indexed = true;
15
16    public function authorise()
17    {
18        return current_user_can('manage_options');
19    }
20
21    public function handler(WP_REST_Request $request)
22    {
23        wp_send_json_success([
24            'status'     => 'success',
25            'response' => 'pong',
26        ]);
27    }
28}

1<?php
2namespace MyPlugin\RestApi;
3
4use WP_REST_Request;
5use EvoWpRestRegistration\BaseRestController;
6
7defined('ABSPATH') or exit;
8
9class CheckSomevar extends BaseRestController
10{
11	protected $path = 'check-somevar';
12    protected $methods = 'POST';
13    protected $rules = [
14        'somevar' => ['required','numeric']
15    ]
16
17    public function handler()
18    {
19        $validated = $this->validated();
20
21        // Only fields with rules that have been passed will be on your validated parameters.
22
23        // Failure will result in a WP_Error('validation_failed') error being returned (HTTP status 400)
24
25		wp_send_json_success([
26            'status' => 'success',
27            'response' => 'somevar was a number',
28        ]);
29    }
30}

[
    'required' => '%param% is required',
    'string' => '%param% must be a string',
    'numeric' => '%param% must be numeric',
    'array' => '%param% must be an array',
    'boolean' => '%param% must be true or false',
    'email' => 'Valid email address is required',
    'unique' => '%value% already exists as a %param%',
    'exists' => '%param% must exist on %args%',
    'in' => '%param% must be one of %args%',
	'not_in' => '%param% must be not be any of %args%',
    'json' => '%param% must be a valid JSON string',
    'url' => '%param% must be a valid URL',
    'min' => '%param% must be at least %args%',
    'max' => '%param% must be no more than %args%',
    'lowercase' => '%param% must be lowercase',
    'uppercase' => '%param% must be uppercase',
    'starts_with' => '%param% must start with one of the following: %args%',
    'ends_with' => '%param% must end with one of the following: %args%',
    'alpha_underscore' => '%param% can only contain letters and underscores',
    'alpha_dash' => '%param% can only contain letters and hyphens',
    'alpha_num' => '%param% can only contain letters and numbers',
    'hex_colour' => '%param% must be a hex colour',
    'file' => '%param% must be a valid file',
    'extensions' => '%param% must be a file with extension of %args%',
    'mimetypes' => '%param% must be a file with a mime type of %args%'
];

1class CheckSomevar extends BaseRestController
2{
3    protected $rules = [
4        'somevar' => ['required','numeric']
5    ]
6
7	protected $messages = [
8		'required' => 'Required!'
9	];
10
11    public function handler()
12    {
13        $validated = $this->validated();
14
15        // do stuff
16    }
17}