sfdx force:schema:sobject:describe

Displays the metadata for a standard or custom object


--jsonFormat output as json
--loglevel <loglevel>Logging level for this command invocation
-u, --targetusername <targetusername>Username or alias for the target org; overrides default target org
--apiversion <apiversion>Override the api version used for api requests made by this command
-s, --sobjecttype <sobjecttype>The API name of the object to describe
-t, --usetoolingapiExecute with Tooling API