REST API in MVC. Why can't reach posted JSON data

Hello, trying to create REST API in my MVC project. Correct me if I am wrong.

First of all declared roustes:

$router->addGet( "/api/products", "api::products" );

$router->addGet( "/api/products/{ean:[0-9]+}", "api::productByEAN" );

$router->addPost( "/api/products", "api::productCreate" );

Then in my ApiController.php created basic functions:

<?php

class ApiController extends ControllerBase {

public function productsAction()
{

    return "all products";

}

public function productByEANAction()
{

    $ean = $this->dispatcher->getParam("ean");
    return $ean; // just check if returning correct value for now

}

public function productCreateAction()
{

    $postData = $this->request->getJsonRawBody();
    $rawPostData = $this->request->getRawBody(); // testing purpose
    $post = $this->request->getPost(); // testing purpose

    $data = file_get_contents("php://input"); // testing purpose
    $data = json_decode($data, TRUE); // testing purpose

    return var_dump($postData) .  " " . var_dump($rawPostData) .  " " . var_dump($post) .  " " . var_dump($data);

}

}

There is my problem. Now when I am trying to get posted JSON data getJsonRawBody() returns null. Trying with curl:

curl -d '{"key1":"value1", "key2":"value2"}' -H "Content-Type: application/json" -X POST https://localhost/po-web/api/products

Result:

G:\xampp\htdocs\po-web>curl -d '{"key1":"value1", "key2":"value2"}' -H "Content-Type: application/json" -X POST https://localhost/po-web/api/products curl: (3) [globbing] unmatched close brace/bracket at pos 12 NULL string(14) "'{key1:value1," array(0) { } NULL

Error causes space between value1 and key2. Why?

With deleted space getJsonRawBody() still dont working but dont raise error.

curl -d '{"key1":"value1","key2":"value2"}' -H "Content-Type: application/json" -X POST https://localhost/po-web/api/products

Result:

G:\xampp\htdocs\po-web>curl -d '{"key1":"value1","key2":"value2"}' -H "Content-Type: application/json" -X POST https://localhost/po-web/api/products NULL string(27) "'{key1:value1,key2:value2}'" array(0) { } NULL

Thank you for any help.