Disclosed herein are computer systems and computer implemented methods for mirroring server-side data hierarchy on a client. The methods involve sending or receiving a request for a instructions to be executed on the client; determining that the webpage requires a mirrored structure to be created on the client side; and receiving or delivering computer instructions, wherein the computer instructions comprise information that, when executed, create a client-side data hierarchy on the client, the client-side data hierarchy mirroring the server-side data hierarchy. The server-side data hierarchy may be a tree data structure and further comprises: a plurality of server-side nodes, each node comprising substantially independent functionality. The client-side data hierarchy mirroring the server-side data hierarchy comprises a plurality of client-side nodes, wherein each client-side nodes corresponds with one of the plurality of server-side nodes.