src/JsonHelper.php
protected function sendJson(Response $response, $payload): Response
    {
        $response->getBody()->write(json_encode($payload));
        return $response->withHeader('Content-Type', 'application/json');
    }
protected function sendJson(Response $response, $payload): Response
    {
        $response->getBody()->write(json_encode($payload));
        return $response->withHeader('Content-Type', 'application/json');
    }
Send something as JSON.

@param \Psr\Http\Message\ResponseInterface $response  The response
@param mixed $payload  The object to serialize
@return \Psr\Http\Message\ResponseInterface  The JSON response