images.json

{
  "lexicon": 1,
  "id": "app.bsky.embed.images",
  "description": "A set of images embedded in a Bluesky record (eg, a post).",
  "defs": {
    "main": {
      "type": "object",
      "required": ["images"],
      "properties": {
        "images": {
          "type": "array",
          "items": { "type": "ref", "ref": "#image" },
          "maxLength": 4
        }
      }
    },
    "image": {
      "type": "object",
      "required": ["image", "alt"],
      "properties": {
        "image": {
          "type": "blob",
          "accept": ["image/*"],
          "maxSize": 1000000
        },
        "alt": {
          "type": "string",
          "description": "Alt text description of the image, for accessibility."
        },
        "aspectRatio": {
          "type": "ref",
          "ref": "app.bsky.embed.defs#aspectRatio"
        }
      }
    },
    "view": {
      "type": "object",
      "required": ["images"],
      "properties": {
        "images": {
          "type": "array",
          "items": { "type": "ref", "ref": "#viewImage" },
          "maxLength": 4
        }
      }
    },
    "viewImage": {
      "type": "object",
      "required": ["thumb", "fullsize", "alt"],
      "properties": {
        "thumb": {
          "type": "string",
          "format": "uri",
          "description": "Fully-qualified URL where a thumbnail of the image can be fetched. For example, CDN location provided by the App View."
        },
        "fullsize": {
          "type": "string",
          "format": "uri",
          "description": "Fully-qualified URL where a large version of the image can be fetched. May or may not be the exact original blob. For example, CDN location provided by the App View."
        },
        "alt": {
          "type": "string",
          "description": "Alt text description of the image, for accessibility."
        },
        "aspectRatio": {
          "type": "ref",
          "ref": "app.bsky.embed.defs#aspectRatio"
        }
      }
    }
  }
}