Is there API for Waves Keeper?

Need address and balance of current WK’s account.

Waves Keeper API documentation is here:
You can get an address, to get balance for the address you can use Node REST API. Just make one call to this endpoint -!/addresses/balanceWithConfirmations_1

В примерах вижу что можно с помощью JS открыть кипер, но не могу найти как это делается. Подскажите пожалуйста

Keep this topic english please.

In the examples, I see that I can open the keeper using JS, but I cannot find how it is done. Tell me please