atmosphere javascript json string websocket

Websocket frame size limitation

I’m sending huge chunks of JSON data through websockets. The JSON may have over 1000 entries. Due to the frame size limitation, the Websocket protocol automatically splits the JSON into frames, which cannot be helped. As we cannot change the frame size of websockets.

The problem:

When I try to evaluate my JSON using JSON.parse it gives me a parsing error which is obvious because the frames are not complete JSON objects. All this happens in the Websocket onmessage event callback. How can I recieve the huge JSON in differnt frames and still be able to parse it?
I have tried to concat the frames in onmessage still the error persists.

Side question:

How to concatinate a broken JSON properly?