index.js

const EthereumRpc = require("ethereum-rpc-promise");
var request = require("request");
let eth = new EthereumRpc("http://35.231.148.208:8545");

/*
eth.web3_clientVersion().then(x => {
  console.log(x);
});
eth.eth_protocolVersion().then(x => {
  console.log("eth_protocolVersion:", x);
});
eth.eth_syncing().then(x => {
  console.log("eth_syncing:", x);
});*/

//List of management APIs
//admin_setSolc,admin_startRPC, not-working,
const admin = [
  "admin_addPeer",
  "admin_datadir",
  "admin_nodeInfo",
  "admin_peers",
  "admin_setSolc",
  "admin_startRPC",
  "admin_stopRPC",
  "admin_startWS",
  "admin_stopWS"
];

const debug = [
  "debug_backtraceAt",
  "debug_blockProfile",
  "debug_cpuProfile",
  "debug_dumpBlock",
  "debug_gcStats",
  "debug_getBlockRlp",
  "debug_goTrace",
  "debug_memStats",
  "debug_seedHash",
  "debug_setHead",
  "debug_setBlockProfileRate",
  "debug_stacks",
  "debug_startCPUProfile",
  "debug_startGoTrace",
  "debug_stopCPUProfile",
  "debug_stopGoTrace",
  "debug_traceBlock",
  "debug_traceBlockByNumber",
  "debug_traceBlockByHash",
  "debug_traceBlockFromFile",
  "debug_traceTransaction",
  "debug_verbosity",
  "debug_vmodule",
  "debug_writeBlockProfile",
  "debug_writeMemProfile"
];

const miner = [
  "miner_setExtra",
  "miner_setGasPrice",
  "miner_start",
  "miner_stop",
  "miner_setEtherBase"
];

const personal = [
  "personal_importRawKey",
  "personal_listAccounts",
  "personal_lockAccount",
  "personal_newAccount",
  "personal_unlockAccount",
  "personal_sendTransaction",
  "personal_sign",
  "personal_ecRecover"
];

const txpool = ["txpool_content", "txpool_inspect", "txpool_status"];

const info = [];

//Sendrequest
function SendReq(method, params) {
  request.post(
    "http://35.231.148.208:8545/",
    { json: { jsonrpc: "2.0", method: method, params: [], id: 74 } },
    function(error, response, body) {
      console.log("ERROR:", error);

      console.log("--request.post--", body);
    }
  );
}

SendReq(personal[1]);