To get Entity Metadata using JavaScript, we can use EntityDefinitions.
For example, to get the entity definition for the Contact entity:

We use the URL:
https://yourcrm.crm.dynamics.com/api/data/v8.2/EntityDefinitions(LogicalName=’contact’):

To select a particular field, for example, color:
https://yourcrm.crm.dynamics.com/api/data/v8.2/EntityDefinitions(LogicalName=’contact’)?$select=EntityColor:


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