json/doc/mkdocs/docs/features/json_pointer.md

JSON Pointer

The library supports JSON Pointer (RFC 6901) as alternative means to address structured values.

// a JSON value
json j_original = R"({
  "baz": ["one", "two", "three"],
  "foo": "bar"
})"_json;

// access members with a JSON pointer (RFC 6901)
j_original["/baz/1"_json_pointer];
// "two"