引用根元素作为 JSON 路径表达式中的键

Question

I have a JSON like this

{ 
    "a" : 1,
    "key_to_find" : "value_of_key",
    "nested" : {
         "value_of_key" : "real_value",
         "b" : 2
    }
}

I want to create a JSON Path expression to get "real_value", but I don't now the key "value_of_key" so I need to dynamically reference it. I tried something like:

$.nested['$.key_to_find']

but it doesn't work. How can I reference to root element value as key to get children values? Is that possible?

I need to use it inside AWS Step Functions, so no programming languages/libraries can be used.

Answer 1

References like this aren't part of JSON Path, though I think since you're using them inside AWS, you'll need to see exactly what they support. It varies. Widely.

We (the team working on the coming specification ) have looked at the idea of a key() or index() function, however. You may find this discussion enlightening as well.