Format.ext

Exchange-specific extensions for this size entry. The spec defines nothing inside it, so its contents depend on the exchange's documentation.

CurrentobjectOptionalSince 2.4

Field facts

Path: imp.banner.format.ext, imp.audio.companionad.format.ext, imp.video.companionad.format.ext
Object: Format
Type: object
Requirement: Optional
Added: OpenRTB 2.4
Spec section: 3.2.10

Where the field sits in a payload, with everything else left out:

{
  "id": "req-1",
  "imp": [
    {
      "banner": {
        "format": [
          {
            "ext": {}
          }
        ]
      }
    }
  ]
}

Added in OpenRTB 2.4, and present in the latest snapshot. The table shows how each version's spec text types the field.

Versions	Type in the spec	Required	Deprecated
2.4	object	No	No
2.5 to 2.6-202606	object	No	No