For Vega and Vega-Lite, the translation between lists and JSON is a little
bit particular. This function, vw_as_json(), can be used to translate
to JSON; as_vegaspec() can be used to translate from JSON.
vw_as_json(spec, pretty = TRUE)An object to be coerced to vegaspec, a Vega/Vega-Lite specification
logical indicates to use pretty (vs. minified) formatting
jsonlite::json object
vw_as_json(spec_mtcars)
#> {
#> "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
#> "width": 300,
#> "height": 300,
#> "description": "An mtcars example.",
#> "data": {
#> "values": [
#> {
#> "mpg": 21,
#> "cyl": 6,
#> "disp": 160,
#> "hp": 110,
#> "drat": 3.9,
#> "wt": 2.62,
#> "qsec": 16.46,
#> "vs": 0,
#> "am": 1,
#> "gear": 4,
#> "carb": 4,
#> "_row": "Mazda RX4"
#> },
#> {
#> "mpg": 21,
#> "cyl": 6,
#> "disp": 160,
#> "hp": 110,
#> "drat": 3.9,
#> "wt": 2.875,
#> "qsec": 17.02,
#> "vs": 0,
#> "am": 1,
#> "gear": 4,
#> "carb": 4,
#> "_row": "Mazda RX4 Wag"
#> },
#> {
#> "mpg": 22.8,
#> "cyl": 4,
#> "disp": 108,
#> "hp": 93,
#> "drat": 3.85,
#> "wt": 2.32,
#> "qsec": 18.61,
#> "vs": 1,
#> "am": 1,
#> "gear": 4,
#> "carb": 1,
#> "_row": "Datsun 710"
#> },
#> {
#> "mpg": 21.4,
#> "cyl": 6,
#> "disp": 258,
#> "hp": 110,
#> "drat": 3.08,
#> "wt": 3.215,
#> "qsec": 19.44,
#> "vs": 1,
#> "am": 0,
#> "gear": 3,
#> "carb": 1,
#> "_row": "Hornet 4 Drive"
#> },
#> {
#> "mpg": 18.7,
#> "cyl": 8,
#> "disp": 360,
#> "hp": 175,
#> "drat": 3.15,
#> "wt": 3.44,
#> "qsec": 17.02,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 2,
#> "_row": "Hornet Sportabout"
#> },
#> {
#> "mpg": 18.1,
#> "cyl": 6,
#> "disp": 225,
#> "hp": 105,
#> "drat": 2.76,
#> "wt": 3.46,
#> "qsec": 20.22,
#> "vs": 1,
#> "am": 0,
#> "gear": 3,
#> "carb": 1,
#> "_row": "Valiant"
#> },
#> {
#> "mpg": 14.3,
#> "cyl": 8,
#> "disp": 360,
#> "hp": 245,
#> "drat": 3.21,
#> "wt": 3.57,
#> "qsec": 15.84,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 4,
#> "_row": "Duster 360"
#> },
#> {
#> "mpg": 24.4,
#> "cyl": 4,
#> "disp": 146.7,
#> "hp": 62,
#> "drat": 3.69,
#> "wt": 3.19,
#> "qsec": 20,
#> "vs": 1,
#> "am": 0,
#> "gear": 4,
#> "carb": 2,
#> "_row": "Merc 240D"
#> },
#> {
#> "mpg": 22.8,
#> "cyl": 4,
#> "disp": 140.8,
#> "hp": 95,
#> "drat": 3.92,
#> "wt": 3.15,
#> "qsec": 22.9,
#> "vs": 1,
#> "am": 0,
#> "gear": 4,
#> "carb": 2,
#> "_row": "Merc 230"
#> },
#> {
#> "mpg": 19.2,
#> "cyl": 6,
#> "disp": 167.6,
#> "hp": 123,
#> "drat": 3.92,
#> "wt": 3.44,
#> "qsec": 18.3,
#> "vs": 1,
#> "am": 0,
#> "gear": 4,
#> "carb": 4,
#> "_row": "Merc 280"
#> },
#> {
#> "mpg": 17.8,
#> "cyl": 6,
#> "disp": 167.6,
#> "hp": 123,
#> "drat": 3.92,
#> "wt": 3.44,
#> "qsec": 18.9,
#> "vs": 1,
#> "am": 0,
#> "gear": 4,
#> "carb": 4,
#> "_row": "Merc 280C"
#> },
#> {
#> "mpg": 16.4,
#> "cyl": 8,
#> "disp": 275.8,
#> "hp": 180,
#> "drat": 3.07,
#> "wt": 4.07,
#> "qsec": 17.4,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 3,
#> "_row": "Merc 450SE"
#> },
#> {
#> "mpg": 17.3,
#> "cyl": 8,
#> "disp": 275.8,
#> "hp": 180,
#> "drat": 3.07,
#> "wt": 3.73,
#> "qsec": 17.6,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 3,
#> "_row": "Merc 450SL"
#> },
#> {
#> "mpg": 15.2,
#> "cyl": 8,
#> "disp": 275.8,
#> "hp": 180,
#> "drat": 3.07,
#> "wt": 3.78,
#> "qsec": 18,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 3,
#> "_row": "Merc 450SLC"
#> },
#> {
#> "mpg": 10.4,
#> "cyl": 8,
#> "disp": 472,
#> "hp": 205,
#> "drat": 2.93,
#> "wt": 5.25,
#> "qsec": 17.98,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 4,
#> "_row": "Cadillac Fleetwood"
#> },
#> {
#> "mpg": 10.4,
#> "cyl": 8,
#> "disp": 460,
#> "hp": 215,
#> "drat": 3,
#> "wt": 5.424,
#> "qsec": 17.82,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 4,
#> "_row": "Lincoln Continental"
#> },
#> {
#> "mpg": 14.7,
#> "cyl": 8,
#> "disp": 440,
#> "hp": 230,
#> "drat": 3.23,
#> "wt": 5.345,
#> "qsec": 17.42,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 4,
#> "_row": "Chrysler Imperial"
#> },
#> {
#> "mpg": 32.4,
#> "cyl": 4,
#> "disp": 78.7,
#> "hp": 66,
#> "drat": 4.08,
#> "wt": 2.2,
#> "qsec": 19.47,
#> "vs": 1,
#> "am": 1,
#> "gear": 4,
#> "carb": 1,
#> "_row": "Fiat 128"
#> },
#> {
#> "mpg": 30.4,
#> "cyl": 4,
#> "disp": 75.7,
#> "hp": 52,
#> "drat": 4.93,
#> "wt": 1.615,
#> "qsec": 18.52,
#> "vs": 1,
#> "am": 1,
#> "gear": 4,
#> "carb": 2,
#> "_row": "Honda Civic"
#> },
#> {
#> "mpg": 33.9,
#> "cyl": 4,
#> "disp": 71.1,
#> "hp": 65,
#> "drat": 4.22,
#> "wt": 1.835,
#> "qsec": 19.9,
#> "vs": 1,
#> "am": 1,
#> "gear": 4,
#> "carb": 1,
#> "_row": "Toyota Corolla"
#> },
#> {
#> "mpg": 21.5,
#> "cyl": 4,
#> "disp": 120.1,
#> "hp": 97,
#> "drat": 3.7,
#> "wt": 2.465,
#> "qsec": 20.01,
#> "vs": 1,
#> "am": 0,
#> "gear": 3,
#> "carb": 1,
#> "_row": "Toyota Corona"
#> },
#> {
#> "mpg": 15.5,
#> "cyl": 8,
#> "disp": 318,
#> "hp": 150,
#> "drat": 2.76,
#> "wt": 3.52,
#> "qsec": 16.87,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 2,
#> "_row": "Dodge Challenger"
#> },
#> {
#> "mpg": 15.2,
#> "cyl": 8,
#> "disp": 304,
#> "hp": 150,
#> "drat": 3.15,
#> "wt": 3.435,
#> "qsec": 17.3,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 2,
#> "_row": "AMC Javelin"
#> },
#> {
#> "mpg": 13.3,
#> "cyl": 8,
#> "disp": 350,
#> "hp": 245,
#> "drat": 3.73,
#> "wt": 3.84,
#> "qsec": 15.41,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 4,
#> "_row": "Camaro Z28"
#> },
#> {
#> "mpg": 19.2,
#> "cyl": 8,
#> "disp": 400,
#> "hp": 175,
#> "drat": 3.08,
#> "wt": 3.845,
#> "qsec": 17.05,
#> "vs": 0,
#> "am": 0,
#> "gear": 3,
#> "carb": 2,
#> "_row": "Pontiac Firebird"
#> },
#> {
#> "mpg": 27.3,
#> "cyl": 4,
#> "disp": 79,
#> "hp": 66,
#> "drat": 4.08,
#> "wt": 1.935,
#> "qsec": 18.9,
#> "vs": 1,
#> "am": 1,
#> "gear": 4,
#> "carb": 1,
#> "_row": "Fiat X1-9"
#> },
#> {
#> "mpg": 26,
#> "cyl": 4,
#> "disp": 120.3,
#> "hp": 91,
#> "drat": 4.43,
#> "wt": 2.14,
#> "qsec": 16.7,
#> "vs": 0,
#> "am": 1,
#> "gear": 5,
#> "carb": 2,
#> "_row": "Porsche 914-2"
#> },
#> {
#> "mpg": 30.4,
#> "cyl": 4,
#> "disp": 95.1,
#> "hp": 113,
#> "drat": 3.77,
#> "wt": 1.513,
#> "qsec": 16.9,
#> "vs": 1,
#> "am": 1,
#> "gear": 5,
#> "carb": 2,
#> "_row": "Lotus Europa"
#> },
#> {
#> "mpg": 15.8,
#> "cyl": 8,
#> "disp": 351,
#> "hp": 264,
#> "drat": 4.22,
#> "wt": 3.17,
#> "qsec": 14.5,
#> "vs": 0,
#> "am": 1,
#> "gear": 5,
#> "carb": 4,
#> "_row": "Ford Pantera L"
#> },
#> {
#> "mpg": 19.7,
#> "cyl": 6,
#> "disp": 145,
#> "hp": 175,
#> "drat": 3.62,
#> "wt": 2.77,
#> "qsec": 15.5,
#> "vs": 0,
#> "am": 1,
#> "gear": 5,
#> "carb": 6,
#> "_row": "Ferrari Dino"
#> },
#> {
#> "mpg": 15,
#> "cyl": 8,
#> "disp": 301,
#> "hp": 335,
#> "drat": 3.54,
#> "wt": 3.57,
#> "qsec": 14.6,
#> "vs": 0,
#> "am": 1,
#> "gear": 5,
#> "carb": 8,
#> "_row": "Maserati Bora"
#> },
#> {
#> "mpg": 21.4,
#> "cyl": 4,
#> "disp": 121,
#> "hp": 109,
#> "drat": 4.11,
#> "wt": 2.78,
#> "qsec": 18.6,
#> "vs": 1,
#> "am": 1,
#> "gear": 4,
#> "carb": 2,
#> "_row": "Volvo 142E"
#> }
#> ]
#> },
#> "mark": "point",
#> "encoding": {
#> "x": {
#> "field": "wt",
#> "type": "quantitative"
#> },
#> "y": {
#> "field": "mpg",
#> "type": "quantitative"
#> },
#> "color": {
#> "field": "cyl",
#> "type": "nominal"
#> }
#> }
#> }