App.domain

A domain associated with the app, such as the app's own website. It is descriptive and does not decide where app-ads.txt is read.

CurrentstringOptionalSince 2.0

Field facts

Path: app.domain
Object: App
Type: string
Requirement: Optional
Added: OpenRTB 2.0
Spec section: 3.2.14

How it is used

app-ads.txt crawlers find the developer website through the store listing, not through this field, so a correct App.domain proves nothing about authorization. It is still useful in reporting and for matching apps against lists keyed on domains.

Example

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

{
  "id": "req-1",
  "app": {
    "domain": "puzzlequest.example.com"
  }
}

Common mistakes

Treating App.domain as the place to look for app-ads.txt. The developer URL on the store listing decides that.
Sending a full URL with scheme and path instead of a bare domain.

Version history

Added in OpenRTB 2.0, 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
2.0 to 2.2	string	No	No
2.3 to 2.3.1	string	No	No
2.4	string	No	No
2.5 to 2.6-202606	string	No	No