`eth_getBlockTransactionCountByHash` returns null even when `--txlookuplimit=0` is set

Question

As the title says the following RPC method eth_getBlockTransactionCountByHash only returns null. Geth node is running on Goerli & am using a valid testnet block to fetch the following info. What could be the possible problem?

Command used:

curl --data '{"method":"eth_getBlockTransactionCountByHash","params":["0x78723a14676c6c59491c43b7c316cd4c5b31c6b789a8bbb21116a94caa7dbf60"],"id":1,"jsonrpc":"2.0"}' -H "Content-Type: application/json" -X POST http://localhost:8545  

Answer 1

Your problem come from the fact that Geth node not having complete historical transaction data, by default Geth is in fast syncro mod, so your node only retains the last 1024 blocks' state trie data and it does not know transaction data for older blocks.

The easiest solution is to run your node in full mod geth --goerli --syncmode full notice that it will require more disk space and time to synchronize, as it downloads and processes all historical transaction data.