import (
  "encoding/json"
  "fmt"
  "github.com/qri-io/jsonpointer"
)

var document = []byte(`{ 
  "foo": {
    "bar": {
      "baz": [0,"hello!"]
    }
  }
}`)

func main() {
  parsed := map[string]interface{}{}
  // be sure to handle errors in real-world code!
  json.Unmarshal(document, &parsed)

  // parse a json pointer. Pointers can also be url fragments
  // the following are equivelent pointers:
  // "/foo/bar/baz/1"
  // "#/foo/bar/baz/1"
  // "http:https://example.com/document.json#/foo/bar/baz/1"
  ptr, _ := jsonpointer.Parse("/foo/bar/baz/1")

  // evaluate the pointer against the document
  // evaluation always starts at the root of the document
  got, _ := ptr.Eval(parsed)

  fmt.Println(got)
  // Output: hello!
}