Parameters

DATA, 20 Bytes - address to get the code.
QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

curl https://ethereum-mainnet-rpc.allthatnode.com/8U3JLUhzIDg3GShvy9hkCCSYkLGc11kj \
--request POST \
--header "Content-Type: application/json" \
--data '{
    "jsonrpc":"2.0",
    "id":1,
    "method":"eth_getCode",
    "params":[
        "0xdAC17F958D2ee523a2206206994597C13D831ec7",
        "latest"
    ]
}'

Returns

DATA - the code from the given address.

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "x606060405260043610610196576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff16806306fdde031461019b5780630753c30c14610229578063095ea7b3146102625780630e136b19146102a45780630ecb93c0146102d157806318160ddd1461030a57806323b872dd1461033357806326976e3f1461039457806327e235e3146103e9578063313ce56714610436578063353907141461045f5780633eaaf86b14610....4"
}

Try Yourself