This is a rehash of Michaël Hompus’ post https://blog.hompus.nl/2015/05/28/entity-type-code-using-javascript-only/ to help me remember this very useful trick.

Note that the scripts described in this post are unsupported.

In JavaScript, use Mscrm.EntityPropUtil.EntityTypeName2CodeMap to retrieve the entity type code for a given entity type name, e.g.:

Mscrm.EntityPropUtil.EntityTypeName2CodeMap.new_application   //returns 10008

Use Mscrm.EntityPropUtil.EntityLogicalNameToLocalizedNameMap to retrieve the entity display name for a given entity type name, e.g.:

Mscrm.EntityPropUtil.EntityLogicalNameToLocalizedNameMap.new_application   //returns Credit Application

Depending on how your script was loaded, Mscrm may be null, in which case try looking for it under the parent object instead, i.e. parent.Mscrm.EntityPropUtil…