format query parameter has multiple uses.
The most basic specifies the output format of the response. Available formats are JSON, JSONP, API, TXT and XML. JSON and JSONP will output their respective formats. The value
jsonp can be accompanied by a
txt is used for list responses. It is mostly useful for very large responses, as it returns the objects line by line, so the client program can use a partial response directly. The value
api forces the response to be a complete HTML page with browsable links. This is also the default format if you type in a URL in a browser. The default for a request coming from any other client is
A more advanced use of the
format query parameters has the syntax
format[<VALUETYPE>]=<OUTPUTTYPE>. Right now, the only value type that we support is
datetime. You can specify a datetime output format from values
timestamp fields are synonymous and output datetimes as UNIX time stamps (i.e. seconds from epoch). The other options -
iso-8601 - are also synonymous and will output all datetimes as the human readable ECMA-262 format: YYYY-MM-DDTHH:MM:ss.
Please note that right now we output ECMA-262 datetimes implicitly in the UTC timezone.