Data Formats

The FamilySearch API uses the following data formats.

If you make a GET request, specify the data format using the Accept header. If you make a POST request, specify the media type using the Content-Type header.

Read more about data formats (i.e., "media types") on Wikipedia.

Atom

The Atom data formats are used to provide lists (i.e., "feeds") of data. These feeds are used in ordered result sets, such as search results and change history.

application/x-gedcomx-atom+json

FamilySearch

The FamilySearch data formats provide extensions to the GEDCOM X data formats and are specific to the FamilySearch developer platform.

application/x-fs-v1+json

GEDCOM X

The GEDCOM X data formats define the core data formats for genealogical data.

application/x-gedcomx-v1+json

Third Party Access

The set of Third Party Access restriction that can be set on a tree.

Third Party Access (JSON)