Custom `JSON.stringify` replacer which provides the object path and depth

geojson-custom-replacer.js

// decorator
function replacerWithPath (fn) {
  let paths = new Map()
  return function (key, value) {
    let path = paths.get(this) || '$'
    if (key) path += Array.isArray(this) ? `[${key}]` : `.${key}`
    let v = fn(key, value, path)
    if (v === Object(v)) paths.set(v, path)
    return v
  }
}

// custom replacer fn has access to the jpath
function replacer (key, value, path) {
  console.log(path, key)
  return value
}

// usage
console.log(
  JSON.stringify(value, replacerWithPath(replacer), 2)
)

This works because this within the scope of the replacer called by JSON.stringify is bound to the parent JSON element, while the key and value arguments refer to the child element.