How to send HTTP POST in non-json and get HTTP response in json?

I want to add records to a table using a normal HTTP POST. The payload will look something like data[Model][fieldName]. The HTTP Post is done in json format.

However, I would like the HTTP Response which contains the data validation message to be in json format. Currently, Cakephp will return the HTTP response in HTML. How can I change it to return the HTTP response in json?

Thank you.

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