How does js encrypt ajax post data and transmit it to php for decryption?

Because I do not want to transmit plain text during ajaxpost, I want to encrypt a js object into a string or binary string for transmission in js, but I don't know how to encrypt it, in addition, the encrypted string needs to be decrypted on the php side. it is better to use a php array after decryption. please... because I do not want to transmit plain text during ajax post, I want JavaScript to encrypt a js object into a string or binary string for transmission, but I don't know how to encrypt it, in addition, the encrypted string needs to be decrypted on the php end. after decryption, it is better to use a php array. do you have this requirement? Do you know how to implement this?