enter_object: Dive into a specific object "key"
In sailthru/tidyjson: A Grammar for Turning 'JSON' into Tidy Tables

Description Usage Arguments Details Examples

JSON can contain nested objects, such as "key1": "key2": [1, 2, 3]. The function enter_object() can be used to access the array nested under "key1" and "key2". After using enter_object(), all further tidyjson calls happen inside the referenced object (all other JSON data outside the object is discarded). If the object doesn't exist for a given row / index, then that data.frame row will be discarded.

1	enter_object(x, ...)

`x`	a tbl_json object
`...`	path to filter

This is useful when you want to limit your data to just information found in a specific key. Use the ... to specific a sequence of keys that you want to enter into. Keep in mind that any rows with JSON that do not contain the key will be discarded by this function.

library(magrittr)  # for %>%
c('{"name": "bob", "children": ["sally", "george"]}', '{"name": "anne"}') %>%
  spread_values(parent.name = jstring("name")) %>%
  enter_object("children") %>%
  gather_array %>%
  append_values_string("children")