Monthly Active Users (Line Chart)

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "data": {
    "values": [
      {"month": "Jan", "users": 1200},
      {"month": "Feb", "users": 1500},
      {"month": "Mar", "users": 1800},
      {"month": "Apr", "users": 2400},
      {"month": "May", "users": 3100},
      {"month": "Jun", "users": 4200}
    ]
  },
  "mark": {"type": "line", "point": true, "interpolate": "monotone"},
  "encoding": {
    "x": {"field": "month", "type": "ordinal", "sort": null, "title": null},
    "y": {"field": "users", "type": "quantitative", "title": "Active users"}
  }
}