vl.x().field("Horsepower"), // For x, use the Horsepower field vl.y().field("Miles_per_Gallon"), // For y, use the Miles_per_Gallon field field --> fieldQ vl.x().fieldQ("Horsepower"), // For x, use the Horsepower field vl.y().fieldQ("Miles_per_Gallon"), // For y, use the Miles_per_Gallon field

Ah, @vega/vega-lite-api I think updated. Thanks!

.toJSON() gives TypeError: vl.markCircle(...).data(...).encode(...).toJSON is not a function

I also get the same error with .toJSON

In https://observablehq.com/@uwdata/introduction-to-vega-lite they give a different pattern for viewing the JSON. ``` { const plot = vl.markCircle().encode( vl.x().average('precip'), vl.y().fieldN('city') ); return html`<pre>${JSON.stringify(plot.toObject(), 0, 2)}</pre>`; // format JSON data } ```

Ah thanks! Updated to reference toObject instead.