json rpc client in bash script

jsonrpc.sh

#!/bin/bash                                                                                                                 

rpcserver=""
rpcport=""
rpcuser=""
rpcpassword=""

method="help"
paramsjson="[]"
id="$(uuidgen)"

if [[ "$#" -gt "0" ]]; then
  method="$1"
  shift
  if [[ "$#" -gt "0" ]]; then
    params="$@"
    paramsarray=( "$@" )                                                                                                                                                  
    paramsbyline=$(IFS=$'\n'; echo "${paramsarray[*]}")
    paramsjson=$(echo "$paramsbyline" | jq -R '[.]' | jq -s -c 'add')
  fi  
fi

data=$(jq \
  --null-input \
  --compact-output \
  --arg jsonrpc "2.0" \
  --arg method "$method" \
  --argjson params "$paramsjson" \
  --arg id "$id" \
  '. | .["jsonrpc"]=$jsonrpc | .["method"]=$method | .["params"]=$params | .["id"]=$id')

response=$(echo "$data" | curl -sSL "http://${rpcuser}:${rpcpassword}@${rpcserver}:${rpcport}" \
  -H "Content-Type: application/json" \
  -d @-)

echo "$response" | jq -r 'if .error then .error else .result end'