JSON & jsonlite

Importera data på mellannivå i R

Filip Schouwenaars

Instructor, DataCamp

JSON-objekt

{"id":1,"name":"Frank","age":23,"married":false}

name	value
string	string
	number
	boolean
	null
	JSON object
	JSON array

JSON-objekt

{"id":1,"name":"Frank","age":23,"married":false}

x <- '{"id":1,"name":"Frank","age":23,"married":false}'

r <- fromJSON(x)

str(r)

List of 4
 $ id     : int 1
 $ name   : chr "Frank"
 $ age    : int 23
 $ married: logi FALSE

JSON-array

JSON
[4, 7, 4, 6, 4, 5, 10, 6, 6, 8]

fromJSON('[4, 7, 4, 6, 4, 5, 10, 6, 6, 8]')

4  7  4  6  4  5 10  6  6  8

JSON
[4, "a", 4, 6, 4, "b", 10, 6, false, null]

fromJSON('[4, "a", 4, 6, 4, "b", 10, 6, false, null]')

"4"  "a"  "4"  "6"  "4"  "b"  "10"  "6"  "FALSE"  NA

JSON-nästling

{
    "id": 1,
    "name": "Frank",
    "age": 23,
    "married": false,

    "partner": {
      "id": 4,
      "name": "Julie"
    }

}

JSON-nästling

r <- fromJSON('{"id":1,"name":"Frank","age":23,
      "married":false,"partner":{"id":4,"name":"Julie"}}')

Rstr(r)

List of 5
 $ id     : int 1
 $ name   : chr "Frank"
 $ age    : int 23
 $ married: logi FALSE
 $ partner:List of 2
  ..$ id  : int 4
  ..$ name: chr "Julie"

JSON-array med JSON-objekt

[
    {"id":1, "name":"Frank"}, 
    {"id":4, "name":"Julie"},
    {"id":12, "name":"Zach"}
]

RfromJSON('[{"id":1, "name":"Frank"}, 
            {"id":4, "name":"Julie"},
            {"id":12, "name":"Zach"}]')

  id  name
1  1 Frank
2  4 Julie
3 12  Zach

Andra jsonlite-funktioner

toJSON()
prettify()
minify()

Nu kör vi en övning!

Importera data på mellannivå i R