If I turn on encrypted SDK endpoints, is there a guide on how I use the features with both javascript and c#?

For javascript, you just need to pass in a decryptionKey when instantiating your GrowthBook instance:

const gb = new GrowthBook({
  apiHost: "<https://cdn.growthbook.io>",
  clientKey: "sdk-abc123",
  decryptionKey: "key_abc123",
});

For C#, we don't yet have built-in support for decryption in the SDK

from the SDK I can get both the encrypted and decrypted feature flags?

Ok. There's no easy way to get both encrypted and plain text features from the same API endpoint. You can create multiple SDK Connections in GrowthBook, one with encryption enabled and one without. That will give you two different feature endpoints to fetch from. For javascript, you can use the

setEncryptedFeatures

method if you don't want to fetch from the front-end.

where can i see help for setencryptedfeatures?

async setEncryptedFeatures(_encryptedString_*:*

_string_, _decryptionKey_*?:*

_string_, _subtle_*?:* SubtleCrypto)*:* Promise<_void_>

is a method on the GrowthBook instance. there's no documentation around it (i've added an issue for us to address this), it seems but it's similar to

setFeatures(json)

except you'd pass it the encrypted response string (e.g. the result of

encryptedFeatures

in this example) with a decryption key. if on node, you'll need to pass in the polyfill for subtcrypto too (docs) otherwise the browser's webcrypto should be fine.