Validate JSON?

When you call $this->validate($rules), the method will automatically try to determine the content type and retrieve data for validation.

When you call $this->validation->run($_POST), you yourself define the data to validate.

That's what I figured out, though it took me some time .

As for $_POST, I was trying different things, it was late, I assigned request to this super global. I guess I will change it later to something like $jsonData so it doesn't say $_POST. 

This should result in the following.

PHP Code:

$this->validation->run($jsonData);