Grep "key: value" by key

[techtonik]

Is it possible to get all authors regardless of their location in a document?

In JSONPath it will be $..author, in jq ..|objects.author. What is the equivalent for JMESPath?

{ "store": {
    "book": [ 
      { "category": "reference",
        "author": "Nigel Rees",
        "title": "Sayings of the Century",
        "price": 8.95
      },
      { "category": "fiction",
        "author": "Evelyn Waugh",
        "title": "Sword of Honour",
        "price": 12.99
      },
      { "category": "fiction",
        "author": "Herman Melville",
        "title": "Moby Dick",
        "isbn": "0-553-21311-3",
        "price": 8.99
      },
      { "category": "fiction",
        "author": "J. R. R. Tolkien",
        "title": "The Lord of the Rings",
        "isbn": "0-395-19395-8",
        "price": 22.99
      }
    ],
    "bicycle": {
      "color": "red",
      "price": 19.95
    }
  }
}

Trying to understand it by comparing to known tools https://github.com/stedolan/jq/wiki/For-JSONPath-users

[Thaina]

In my current understanding of JMESPath, there are no way you could traverse any number of depth. It is a feature that specifically removed from JsonPath. You can only flatten it into some finite number of depth

Maybe [*][*][*].author is what you could do

[techtonik]

@Thaina checked [*][*][*].author with http://jmespath.org/tutorial.html and it doesn't work. Seems like the only supported syntax is name[*] for flattening arrays, so you need to know the name. For this particular case store.book[*].author helps to get authors, but that's not a grep that could be used if the document structure is unknown.

[Thaina]

@techtonik Maybe this?

[Thaina]

You might need to write a long list of every possible combination of flattening and flatten it

[techtonik]

*.*[*].author. The structure is still there, but at least no need to retype names.