# OCAPI Resource Data Formats

The Open Commerce API currently supports one data format for resources: JSON. JSON is the default format. XML is not supported as data format for resources any longer.

How you specify a format depends on the underlying HTTP method. For GET requests, you provide a value for the URL request parameter `format` (valid value is json). For POST, PUT, and PATCH requests, you provide a value for the HTTP header `content-type` (valid value is application/json). The HTTP header `content-type` has precedence over the URL request parameter `format`.

:::note
The Open Commerce API supports character encoding in UTF-8 only.
:::