In what encoding is the data fed into the rsa module?

Question

Python

I have a python code with private and public key generation.
There is a JS code that generates the same keys.
The codes have been exchanged with public keys.
If in JS data is encrypted more or less clearly, then in Python both encryption is in bytes and decryption.
How to encrypt code in Python and decrypt it in JS?
Python Module - rsa
JS Library - JSEncrypt