How many build-in Filters do we have in jsonType feature

[parisqian-misa]

In the document, I could not find a list of build-in filters. I saw url, date and empty if-blocks in the code, are they filters?

One more thing, do we have anything like json/object filter, just like what we have with array, to detect whether the value part is a valid json object?

[DavertMik]

In the document, I could not find a list of build-in filters. I saw url, date and empty if-blocks in the code, are they filters

yes, and yes, they should be documented better. I will work on that

One more thing, do we have anything like json/object filter, just like what we have with array, to detect whether the value part is a valid json object?

right now array replaces the object (as in JSON objects are PHP associative arrays). However, this may (should) be improved