I am guessing that the ‘generated’ key was obtained by invoking the exportKey method, using the ‘components’ format. With this setting, this method returns a fixed-structure object whose values are Buffers holding individual key components; it also appears that you have installed some kind of shim that simulates the node.js Buffer API with the Uint8Array object that browsers provide.

If that is so, then it all it should take to get the key object back is to invoke the importKey method:

const key = new NodeRSA();
key.importKey(keyData, 'components');