Dynamics CRM webAPI Meta data Query

 function GetEntityMetaData() {

   var entityType = "Account";
   var metaDataId = getMetaDataIdByName(entityType);
   var schemaNames = getAttributeList(metaDataId);
 }
 function getAttributeList(metaDataId) {
   var attributesList;
   $.ajax({
     type: "GET",
     contentType: "application/json; charset=utf-8",
     datatype: "json",
     url: Xrm.Page.context.getClientUrl() + "/api/data/v8.1/EntityDefinitions(" + metaDataId + ")?$select=LogicalName&$expand=Attributes($select=LogicalName)",
     beforeSend: function (XMLHttpRequest) {
       XMLHttpRequest.setRequestHeader("OData-MaxVersion", "4.0");
       XMLHttpRequest.setRequestHeader("OData-Version", "4.0");
       XMLHttpRequest.setRequestHeader("Accept", "application/json");
       XMLHttpRequest.setRequestHeader("Prefer", "odata.include-annotations=\"OData.Community.Display.V1.FormattedValue\"");
     },
     async: false,
     success: function (data, textStatus, xhr) {
       attributesList = data.Attributes;
     },
     error: function (xhr, textStatus, errorThrown) {
       alert(textStatus + " " + errorThrown);
     }
   });
   return attributesList;
 }
 function getMetaDataIdByName(entityType) {
   var MetadataId;
   $.ajax({
     type: "GET",
     contentType: "application/json; charset=utf-8",
     datatype: "json",
     url: Xrm.Page.context.getClientUrl() + "/api/data/v8.1/EntityDefinitions?$select=DisplayName,IsKnowledgeManagementEnabled,EntitySetName&$filter=SchemaName eq '" + entityType + "'",
     beforeSend: function (XMLHttpRequest) {
       XMLHttpRequest.setRequestHeader("OData-MaxVersion", "4.0");
       XMLHttpRequest.setRequestHeader("OData-Version", "4.0");
       XMLHttpRequest.setRequestHeader("Accept", "application/json");
       XMLHttpRequest.setRequestHeader("Prefer", "odata.include-annotations=\"OData.Community.Display.V1.FormattedValue\"");
     },
     async: false,
     success: function (data, textStatus, xhr) {
       var result = data.value[0];
       MetadataId = result.MetadataId;
     },
     error: function (xhr, textStatus, errorThrown) {
       alert(textStatus + " " + errorThrown);
     }
   });
   return MetadataId;
 }