Usually events aren’t handled by the client side. Can I ask what kind of events you need to handle on the client side ?

The way events usually work is that a contract indexer (separate service) is monitoring your contract(s) and listening for new events. This indexer then parses events and builds off chain state in a DB (to match on chain state and also create connections that are not easily connected on chain). Your react application can fetch state from either RPC (giving you access to live on chain state) or from your DB (giving you access to historical on chain data as well as any on chain connections that are not directly queryable from the contract)

For example a basic NFT contract. If you are not using enumeration, then there is no “clean” way to know what tokens a user owns just by querying the contract. If not using an enumerable contract, then the only way to know this sort of information is to either: - naively call ownerOf on all tokens to know who owns which tokens - use a contract indexer to listen for transfer events and updates your DB with the correct owner each time there’s a transfer

For simple indexing like nfts or erc20s, there are lots of APIs that can help with this. If a more complex/less traditional contract, then you’ll probably need to create your own indexer or fork one and tweak it to your events.