SharePoint Form (Header) Conditional Formatting

bryanfrumkin220​ Please mark as resolved if this fixes your issue.

In SharePoint column formatting JSON, you can wrap your img element with a conditional "display" style or use the ="if()" expression.

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "display": "flex",
    "align-items": "center",
    "background-color": "=if([$IsDarkTheme], '#1f1f1f', '#f3f2f1')",
    "padding": "20px",
    "border-radius": "12px",
    "box-shadow": "0 4px 12px rgba(0, 0, 0, 0.15)",
    "width": "100%",
    "margin-bottom": "20px",
    "border": "2px solid #e1dfdd"
  },
  "children": [
    {
      "elmType": "img",
      "style": {
        "width": "80px",
        "height": "80px",
        "border-radius": "50%",
        "object-fit": "cover",
        "margin-right": "20px",
        "border": "2px solid #ccc",
        "display": "=if([$Headshot] == '', 'none', 'block')"   // <-- Hide if null
      },
      "attributes": {
        "src": "=''+[$Headshot.serverRelativeUrl]"
      }
    },
    {
      "elmType": "div",
      "style": {
        "text-align": "left"
      },
      "children": [
        {
          "elmType": "div",
          "style": {
            "font-size": "26px",
            "font-weight": "600",
            "color": "=if([$IsDarkTheme], '#ffffff', '#323130')",
            "margin-bottom": "6px"
          },
          "txtContent": "= 'Employee Overview for ' + [$Nickname]"
        },
        {
          "elmType": "div",
          "style": {
            "font-size": "14px",
            "color": "=if([$IsDarkTheme], '#cccccc', '#605e5c')"
          },
          "txtContent": ""
        }
      ]
    }
  ]
}