如何将uint8数组转换为base64编码的字符串?

I got a webSocket comunication, I recieve base64 encoded string, convert it to uint8 and work on it, but now I need to send back, I got the uint8 array, and need to convert it to base64 string, so I can send it. How can I make this convertion?I got a webSocket comunication, I recieve base6