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The sheet.json is a file required for character sheets that are submitted to Roll20. If you're just using a custom sheet in your normal game, you don't need the sheet.json(in fact, you can't even use one).

Default Sheet Settings are optional things saved on the sheet.json.

Creating a sheet.json File

See the instructions on github.com/Roll20/roll20-character-sheets#creating-your-own

Example

sheet.json for roll20's kitchensink sheet example, contains all mandatory sections. kitchensink/sheet.json

{
  "html": "kitchensink.html",
  "css": "kitchensink.css",
  "authors": "Roll20 Team (@roll20app)",
  "roll20userid": "1",
  "preview": "kitchensink.png",
  "instructions": "**This is a test**\n\nYou can put Markdown-formatted instructions here for how to use your sheet. Please try to keep it moderately-short (500 characters or less is preferred).",
  "legacy": true
}

You can also use hyperlinks in the description-field.

Stargate-RPG/sheet.json Example:

"legacy": false, as the sheet have been updated to CSE
"useroptions" contains Default Sheet Settings that the GM can change for the game, affecting values & looks of newly created sheets.

{
  "html": "stargate.html",
  "css": "stargate.css",
  "authors": "Andreas J.",
  "roll20userid": "1223200",
  "preview": "stargate_preview.png",
  "instructions": "Official character sheet for the 'Stargate RPG' by Wyvern Gaming.\n\n* [Character Sheet Documentation](https://wiki.roll20.net/Stargate)",
  "useroptions": [
    {
      "attribute": "show_name",
      "displayname": "Show name in rolls? ",
      "type": "select",
      "options": [
        "Yes|{{subtitle=@{character_name} }}",
        "No| "
      ],
      "default": "{{subtitle=@{character_name} }}",
      "description": "Determine if newly created characters displayed their names in rolls by default. GMs can find useful to hide the names of NPCs in some situations. This option can be be later changed on individual sheets from the 'Settings-page.'"
    },
    {
      "attribute": "whisper",
      "displayname": "Whisper Rolls to GM?",
      "type": "checkbox",
      "value": "/w gm",
      "description": "Determine if newly created characters only shows their rolls to the GM by default. Players and GMs can sometime find it useful to hide a roll from the other players if a secret roll needs to be made. This option can be be later changed on individual sheets from the 'Settings-page.'"
    },
    {
      "attribute": "campaign",
      "displayname": "Campaign Name: ",
      "type": "text",
      "value": "",
      "description": "Writes the campaign name on newly created character sheets."
    },
    {
      "attribute": "td",
      "displayname": "Tension die?",
      "type": "select",
      "options": [
        "d4|d4",
        "d6|d6",
        "d8|d8",
        "d10|d10",
        "d12|d12"
      ],
      "default": "d6",
      "description": "Determine what the Tension Die is for newly created character."
    }
  ],
  "legacy": false
}