See [Place Output Formats](Output.md) for details on each format. (Default: jsonv2)
+!!! note
+ The Nominatim service at
+ [https://nominatim.openstreetmap.org](https://nominatim.openstreetmap.org)
+ has a different default behaviour for historical reasons. When the
+ `format` parameter is omitted, the request will be forwarded to the Web UI.
+
* `json_callback=<string>`
Wrap JSON output in a callback function ([JSONP](https://en.wikipedia.org/wiki/JSONP)) i.e. `<string>(<json>)`.