I am looking for just meta information from openFDA. Whenever I do a query I get all the information like meta, results. My requirement doesn't deal with results. We just care about metadata, because we only want "total" field information for our query. So we expect the JSON should only display metadata. That's how we can get the information easily without any performance issues.
At this time it's not currently possible to have the API return only the meta section. You can, as others have pointed out, restrict the API to return only one record along with the meta section. Let us know if this proves to be a problem for your use case.