Hello!
I have custom field in Pipedrive with name ‘test1212’, but when I am receiving by API this record it is returns to me md5 id. I need to receive name of this field.
Welcome to the community, @Ihor_Khrypchenko! 
You can query the GET /dealFields endpoint to get all the fields (incl. custom fields) related to deals and find the name of your field according to the key from your screenshot.
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Thank you @Helena_Sul ! But what about endpoint for all entities? I mean can I do request to receive all [entity]Fields by one request?
Like it is working on your web (graphql endpoint).
We do not have an endpoint for all entities. For main entities, we offer the ActivityFields, DealFields, NoteFields, OrganizationFields, PersonFields and ProductFields APIs.