Find objects that do not have key

[dbclkclk]

I have these objects:

 {"id":"1", "name":"blah", "age":"12"}
 {"name":"blah", "age":"12"}

And I wanted a way to find the objects that do not contain the key "id". Is this possible?

[dtolnay]

Try this:

jq 'select(has("id") | not)'

[Siva-Thilak]

I know it's been a while. But I had a simple question. What if the "id" here is an array?
and what if the array name has spaces in between .
For eg,
{"id":"1", "a b c":[ "name" : "foo" ] }
{"id":"2" }
and I want to display only first object that contains the array?
could you kindly help me on this one?