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How to generate address from xpub in JS? Should i use BIP39 or 44? If yes, how exactly?

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You can use ethereumjs-wallet, from their unit tests

var xpub = 'xpub661MyMwAqRbcGout4B6s29b6gGQsowyoiF6UgXBEr7eFCWYfXuZDvRxP9zEh1Kwq3TLqDQMbkbaRpSnoC28oWvjLeshoQz1StZ9YHM1EpcJ'
var addr = Wallet.fromExtendedPublicKey(xpub).getAddressString()
assert(addr, '0xb800bf5435f67c7ee7d83c3a863269969a57c57c')
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