Is there API for Waves Keeper?

Need address and balance of current WK’s account.

Waves Keeper API documentation is here: https://docs.wavesplatform.com/en/development-and-api/waves-keeper-api/waves-keeper-api.html
You can get an address, to get balance for the address you can use Node REST API. Just make one call to this endpoint - https://nodes.wavesplatform.com/api-docs/index.html#!/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