How to create Contract Hash Expiration Key

[twin rain]

I am trying this approach to read expiration data for a contract hash but it doesn't produce valid data.
Could you please help with contract hash expiration key?

const getContractHashExpirationKey = (contract_address) => {
    
    let contract = new SorobanClient.Contract(contract_address);
    let footprint = contract.getFootprint();
    let keyHash = SorobanClient.hash(footprint[0].toXDR());
    const expirationKey = xdr.LedgerKey.expiration(
        new xdr.LedgerKeyExpiration({ keyHash }),
    ).toXDR("base64");

    return expirationKey;
}

[ancient needle]

seems correct conceptually, probably some JS weirdness... FWIW soroban-rpc should return expiration for a given key, but I'm not sure if that's in the current release

[pseudo prism]

Change footprint[0] for footprint[1], the footprint gives you two ledger keys:
0: ContractCode
1: ContractData

The ContractData entry is the one that includes the information while the first one is just the contract code hash

[twin rain]

Thanks, but I need to check hash specifically, I was bumping contract only and hash expired.

[pseudo prism]

With hash expired you mean the WASM code?

[twin rain]

Yes