I've released Node.js lib that provides real-time market data feeds for top crypto exchanges.

It handles data normalization, order book reconstruction, custom trade bars (eg volume based etc), consolidates multiple feeds into one etc. and connects directly to exchanges APIs via WebSockets, has built-in reconnection and stale connection detection logic and more.

It also uses async iteration (for await..of) instead of callbacks.

https://github.com/tardis-dev/tardis-node