question: How to parse a path?

[krombel]

I would like to be able to only parse a specific path in the json object.

e.g.

{
  "a": {
    "b1": {
      "test": "something"
    },
    "b2": {
      "test": "something else"
    }
  }
}

I would like to provide e.g. a.b2.test and would like to get "something else".

This is useful in scenarios where I am only interested in one specific attribute from a probably big json object.
With encoding/json I built a workaround which looped through each "layer" and parsed the object to a map[string]json.RawMessage which I then parsed until the leaf object.
Is there an easy (and opt. more performant) way here? I would like to have a way without the need of parsing the whole input when I only need a few bytes of it.

[dsnet]

Hi, thanks for the question. I think what you're asking for is related to a recent comment over at golang/go#71497 (comment)

There's already JSON Pointer [RFC 6901], which json/v2 is currently using to report error positions. However, it currently doesn't provide any means of going from a jsontext.Pointer to a particular jsontext.Value.

[dsnet]

I'm going to close this. It's something worth potentially adding to json/v2 in the future, but that would probably be discussion to be held over in the golang/go repo.