API Field Names For REST Service Using ROQL

Summary

Need to find out API Field names to use in REST calls using ROQL

Content

Hello, I am looking to find out where I find the fields names to using in REST API service using ROQL.  In the example below which was posted in another post where would I find a emails.address?  Basically if I'm going to use ROQL I am looking to find out where I get those field names to use in my query.

https://site/services/rest/connect/latest/contacts/?q=emails.address='[email protected]'

Thanks!

Joe