Hidden Fields

A non-quoted field name that starts with an underscore (_) is not emitted from the output. To include fields in the configuration that start with an underscore put them in quotes.

Quoted and non-quoted fields share the same namespace unless they start with an underscore.

"_foo": 2
_foo:   3
foo:    4
_#foo:  5

{
    "_foo": 2,
    "foo": 4
}