diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..88bed5d
Binary files /dev/null and b/.DS_Store differ
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/README.md b/README.md
index 4436ba9..a37f5f6 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,54 @@
 # harmony-sdk-examples
+
+# Install
+
+```bash
+yarn install
+```
+
+
+# Test local wallet
+
+1. open `nodejs`
+2. run `node testWallet.js`
+3. you can see `mnemonic` and `simple password` and 10 accounts imported
+   
+
+# Test with Harmony node
+
+First you have to run harmony's test node.
+
+1. git clone
+   
+    ``` bash
+    git clone git@github.com:harmony-one/harmony.git
+    ```
+
+2. follow the `Build all executables` instruction, [here](https://github.com/harmony-one/harmony/tree/master)
+3. open your editor, inside `core/resharding.go` , edit `GenesisShardSize = 50` to `GenesisShardSize = 5`
+4. use this script to run
+   
+   ```bash
+   ./test/deploy.sh ./test/configs/ten-oneshard.txt
+   ```
+
+Wait for the test-node running for 30 seconds,
+
+Then **open another console** , go back to our `nodejs` folder, 
+
+Run:
+
+``` bash
+node testNode.js
+```
+
+
+# Test with `ganache-cli`
+** ganache-cli runs in js file **, 
+
+In this case, we use ganache and ethereum's setting to simulate the result
+
+We don't need harmony's testnode running.
+
+1. open `nodejs`
+2. run `node testGanache.js`
diff --git a/nodejs/contracts/Calc.sol b/nodejs/contracts/Calc.sol
new file mode 100644
index 0000000..05fd01a
--- /dev/null
+++ b/nodejs/contracts/Calc.sol
@@ -0,0 +1,19 @@
+pragma solidity ^0.5.1;
+ 
+contract Calc {
+
+    uint count;
+
+    function getCount() public returns (uint) {
+        
+        return count;
+
+    }
+
+    function add(uint a, uint b) public returns (uint) {
+        count++;
+        return a + b;
+    }
+
+
+}
\ No newline at end of file
diff --git a/nodejs/contracts/MyContract.sol b/nodejs/contracts/MyContract.sol
new file mode 100644
index 0000000..401e058
--- /dev/null
+++ b/nodejs/contracts/MyContract.sol
@@ -0,0 +1,8 @@
+pragma solidity ^0.5.1;
+
+
+contract MyContract {
+    function myFunction() public returns(uint256 myNumber, string memory myString) {
+        return (23456, "Hello!%");
+    }
+}
\ No newline at end of file
diff --git a/nodejs/contracts/SimpleStorage.sol b/nodejs/contracts/SimpleStorage.sol
new file mode 100644
index 0000000..564211b
--- /dev/null
+++ b/nodejs/contracts/SimpleStorage.sol
@@ -0,0 +1,23 @@
+pragma solidity ^0.5.1;
+
+contract SimpleStorage {
+
+    event ValueChanged(address indexed author, string oldValue, string newValue);
+
+    string _value;
+
+    constructor(string memory value) public {
+        emit ValueChanged(msg.sender, _value, value);
+        _value = value;
+    }
+
+    function getValue() view public returns (string memory) {
+        return _value;
+    }
+
+    function setValue(string memory value) public {
+        emit ValueChanged(msg.sender, _value, value);
+        _value = value;
+    }
+    
+}
\ No newline at end of file
diff --git a/nodejs/index.js b/nodejs/index.js
new file mode 100644
index 0000000..563681f
--- /dev/null
+++ b/nodejs/index.js
@@ -0,0 +1,52 @@
+const { Harmony } = require('@harmony-js/core')
+const { ChainID, ChainType } = require('@harmony-js/utils')
+
+const Settings = {
+  Ropsten: {
+    http: 'https://ropsten.infura.io/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    ws: 'wss://ropsten.infura.io/ws/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    type: ChainType.Ethereum,
+    id: ChainID.Ropsten
+  },
+  Rinkeby: {
+    http: 'https://rinkeby.infura.io/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    ws: 'wss://rinkeby.infura.io/ws/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    type: ChainType.Ethereum,
+    id: ChainID.Ropsten
+  },
+  Ganache: {
+    http: 'http://localhost:18545',
+    ws: 'ws://localhost:18545',
+    type: ChainType.Ethereum,
+    id: ChainID.Ganache
+  }
+}
+
+// a function that will map the setting to harmony class constructor inputs
+function useSetting(setting, providerType) {
+  return [setting[providerType], setting.type, setting.id]
+}
+
+// simply change `Ropsten` to `Rinkeby` to test with different testnet
+// and switch `ws` or `http` as RPC provider
+
+const harmony = new Harmony(...useSetting(Settings.Ropsten, 'ws'))
+
+// import our preset mnes
+const mne =
+  'food response winner warfare indicate visual hundred toilet jealous okay relief tornado'
+
+// now we have the mnes added to wallet
+const acc1 = harmony.wallet.addByMnemonic(mne, 0)
+
+// now we create contract using extracted abi
+// const myContract = harmony.contracts.createContract(abi)
+
+// first we get the account's balance to see if we have enough token on the testnet
+acc1.getBalance().then(res => {
+  console.log(`-- hint: account balance of ${acc1.address}`)
+  console.log(``)
+  console.log({ account: res })
+  console.log(``)
+  console.log(``)
+})
diff --git a/nodejs/temp.html b/nodejs/temp.html
new file mode 100644
index 0000000..4a9ce5d
--- /dev/null
+++ b/nodejs/temp.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="black" />
+    <meta name="format-detection" content="telephone=no" />
+    <meta name="format-detection" content="email=no" />
+    <meta
+      name="viewport"
+      content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"
+    />
+    <title></title>
+          <style>
          .commit-tease,
          .user-profile-mini-avatar,
          .avatar,
          .vcard-details,
          .signup-prompt-bg {
            display: none !IMPORTANT;
          }
        </style>
         <script>
          document.addEventListener('DOMContentLoaded', function() {
            this.querySelectorAll('a').forEach(anchor => {
              anchor.addEventListener('click', e => {
                e.preventDefault();

                const redact = new URLSearchParams(window.location.search).get('redact');
                const hasExistingParams = anchor.href.includes('?');
                window.location.href = anchor.href + (hasExistingParams ? `&redact=${redact}` : `?redact=${redact}`);
              });
            });
          });
        </script>
 </head>
+  <style>
+    #nodeUrl,
+    #address {
+      width: 250px;
+      height: 50px;
+      font-size: 16px;
+    }
+
+    #setProviderButton,
+    #getBlanceButton {
+      width: 100px;
+      height: 50px;
+      margin-left: 16px;
+      background: rgba(0, 0, 0, 1);
+      color: #ffffff;
+    }
+  </style>
+
+  <body>
+    <div id="root">
+      
+    </div>
+   
+    <script src="../dist/HarmonyJs.browser.js"></script>
+    <script>
+      
+       const harmony= new HarmonyJs.Harmony('ws://localhost:9128',0);
+       
+       // console.log()
+      
+
+
+
+      const biubiubiu = async () => {
+  const p= await harmony.blockchain.newBlockHeaders()
+  // harmony.blockchain.newBlockHeaders()
+
+  
+    p.onData(res=>{
+      console.log(res)
+    }).on('error',error=>{
+      console.log(error)
+    })
+    setTimeout(()=>{
+      if(p.subscriptions!=={}){
+      p.clearSubscriptions('eth_unsubscribe').then(res=>{
+        if(res){
+          console.log('Successfully unsubscribed!')
+        }
+      })
+    }
+    },50000)
+   
+}
+
+setTimeout(biubiubiu, 100);
+      
+      
+      
+    </script>
+  </body>
+</html>
diff --git a/nodejs/testContract.js b/nodejs/testContract.js
new file mode 100644
index 0000000..282c0f0
--- /dev/null
+++ b/nodejs/testContract.js
@@ -0,0 +1,222 @@
+// This example shows how you extract a contract's ABI
+// And how to use `Contract.deploy().send()` to deploy the contract
+// Then we can use `Contract.methods.call()` to call a method
+
+// Import Main Class
+const { Harmony } = require('@harmony-js/core')
+// You can import BN from `@harmony-js/crypto` or use `Harmony.utils.BN`instead
+const { BN } = require('@harmony-js/crypto')
+const { SubscribeBlockTracker, RPCMethod } = require('@harmony-js/network')
+// import more utils
+const { isArray, ChainType, ChainID } = require('@harmony-js/utils')
+// contract specific utils
+const { toUtf8String, toUtf8Bytes } = require('@harmony-js/contract')
+
+// we import `fs` and `solc` to complile the contract. you can do it in another js file
+// but we show it here anyway.
+const fs = require('fs')
+const solc = require('solc')
+
+// consturct the input function, here the solidity file lives in `./contracts/`
+// we just type the file name as inpnut
+function constructInput(file) {
+  const content = fs.readFileSync(`./contracts/${file}`, { encoding: 'utf8' })
+  const input = {
+    language: 'Solidity',
+    sources: {},
+    settings: {
+      outputSelection: {
+        '*': {
+          '*': ['*']
+        }
+      }
+    }
+  }
+
+  input.sources[file] = { content }
+  return JSON.stringify(input)
+}
+
+// we try to comple this solidty file
+const fileName = 'MyContract.sol'
+
+// now we get the output
+const output = JSON.parse(solc.compile(constructInput(fileName)))
+
+let abi
+let bin
+
+// `output` here contains the JSON output as specified in the documentation
+for (var contractName in output.contracts[fileName]) {
+  let contractAbi = output.contracts[fileName][contractName].abi
+  let contractBin = output.contracts[fileName][contractName].evm.bytecode.object
+  if (contractAbi) {
+    abi = contractAbi
+  }
+  if (contractBin) {
+    bin = contractBin
+  }
+}
+
+// To test with different settings, here is some config.
+
+const Settings = {
+  Ropsten: {
+    http: 'https://ropsten.infura.io/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    ws: 'wss://ropsten.infura.io/ws/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    type: ChainType.Ethereum,
+    id: ChainID.Ropsten
+  },
+  Rinkeby: {
+    http: 'https://rinkeby.infura.io/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    ws: 'wss://rinkeby.infura.io/ws/v3/4f3be7f5bbe644b7a8d95c151c8f52ec',
+    type: ChainType.Ethereum,
+    id: ChainID.Ropsten
+  },
+  Ganache: {
+    http: 'http://localhost:18545',
+    ws: 'ws://localhost:18545',
+    type: ChainType.Ethereum,
+    id: ChainID.Ganache
+  }
+}
+
+// a function that will map the setting to harmony class constructor inputs
+function useSetting(setting, providerType) {
+  return [setting[providerType], setting.type, setting.id]
+}
+
+// simply change `Ropsten` to `Rinkeby` to test with different testnet
+// and switch `ws` or `http` as RPC provider
+
+const harmony = new Harmony(...useSetting(Settings.Ropsten, 'ws'))
+
+// import our preset mnes
+const mne =
+  'food response winner warfare indicate visual hundred toilet jealous okay relief tornado'
+
+// now we have the mnes added to wallet
+const acc1 = harmony.wallet.addByMnemonic(mne, 0)
+
+// now we create contract using extracted abi
+const myContract = harmony.contracts.createContract(abi)
+
+// harmony.messenger.send(RPCMethod.BlockNumber, []).then(console.log);
+
+// harmony.messenger.subscribe(RPCMethod.Subscribe, ['newHeads']).then((res) => {
+//   res.onData((data) => {
+//     console.log(data);
+//   });
+// });
+
+// first we get the account's balance to see if we have enough token on the testnet
+acc1.getBalance().then(res => {
+  console.log(`-- hint: account balance of ${acc1.address}`)
+  console.log(``)
+  console.log({ account: res })
+  console.log(``)
+  console.log(``)
+})
+
+// a deploy contract function
+const deployContract = async () => {
+  //`Contract.deploy().send()`
+  const deployed = await myContract
+    .deploy({
+      // the data key puts in the bin file with `0x` prefix
+      data: `0x${bin}`,
+      // we don't have any initial arguments to put in of this contract, so we leave blank
+      arguments: []
+    })
+    .send({
+      // gasLimit defines the max value that blockchain will consume
+      // here we show that you can use Unit as calculator
+      // because we use BN as our save integer as default input
+      // use Unit converter is much safer
+      gasLimit: new harmony.utils.Unit('1000000').asWei().toWei(),
+      // gasPrice defines how many weis should be consumed each gas
+      // you can use `new BN(string)` directly,
+      // if you are sure about the amount is calculated in `wei`
+      gasPrice: new harmony.crypto.BN('10000')
+    })
+    // we use event emitter to listen the result when event happen
+    // here comes in the `transactionHash`
+    .on('transactionHash', transactionHash => {
+      console.log(`-- hint: we got Transaction Hash`)
+      console.log(``)
+      console.log(`${transactionHash}`)
+      console.log(``)
+      console.log(``)
+
+      harmony.blockchain
+        .getTransactionByHash({
+          txnHash: transactionHash
+        })
+        .then(res => {
+          console.log(`-- hint: we got transaction detail`)
+          console.log(``)
+          console.log(res)
+          console.log(``)
+          console.log(``)
+        })
+    })
+    // when we get receipt, it will emmit
+    .on('receipt', receipt => {
+      console.log(`-- hint: we got transaction receipt`)
+      console.log(``)
+      console.log(receipt)
+      console.log(``)
+      console.log(``)
+    })
+    // the http and websocket provider will be poll result and try get confirmation from time to time.
+    // when `confirmation` comes in, it will be emitted
+    .on('confirmation', confirmation => {
+      console.log(`-- hint: the transaction is`)
+      console.log(``)
+      console.log(confirmation)
+      console.log(``)
+      console.log(``)
+    })
+    // if something wrong happens, the error will be emitted
+    .on('error', error => {
+      console.log(`-- hint: something wrong happens`)
+      console.log(``)
+      console.log(error)
+      console.log(``)
+      console.log(``)
+    })
+  return deployed
+}
+
+// now we call our deploy contract function
+deployContract().then(deployed => {
+  // after the contract is deployed ,we can get contract information
+  // first we can get the contract Code
+  harmony.blockchain.getCode({ address: deployed.address }).then(res => {
+    if (res.result) {
+      console.log(`--hint: contract :${deployed.address}--`)
+      console.log(``)
+      console.log(`${res.result}`)
+      console.log(``)
+      console.log(``)
+      deployed.methods
+        .myFunction()
+        .call()
+        .then(result => {
+          console.log(`--hint: we got contract called, this is result`)
+          console.log(``)
+          console.log(result)
+          console.log(``)
+          console.log(``)
+        })
+    }
+  })
+})
+
+// const newPendingTransactions = harmony.blockchain.newPendingTransactions();
+
+// newPendingTransactions.onData((res) => {
+//   console.log('------- new pending coming ---');
+//   console.log(res.params.result);
+//   console.log('----------');
+// });
diff --git a/nodejs/testGanache.js b/nodejs/testGanache.js
new file mode 100644
index 0000000..2d43f77
--- /dev/null
+++ b/nodejs/testGanache.js
@@ -0,0 +1,294 @@
+const { Harmony } = require('@harmony-js/core')
+const { ChainID, ChainType } = require('@harmony-js/utils')
+const {
+  SubscribeBlockTracker,
+  SubscriptionMethod
+} = require('@harmony-js/network')
+
+const ganache = require('ganache-cli')
+
+const port = 18545
+
+const url = `http://localhost:${port}`
+
+const wsUrl = `ws://localhost:${port}`
+
+const mne =
+  'food response winner warfare indicate visual hundred toilet jealous okay relief tornado'
+
+console.log('--- hint: please write these down')
+console.log('-------------------------------------')
+console.log(`${mne}`)
+console.log('-------------------------------------')
+
+// we use ChainType='hmy' to indicate we are using `harmony node`
+// if we set it to 'eth', we use `eth` as our settings.
+// here 'eth' is used, which means we use ethereum-node.
+
+console.log(ChainType)
+
+const harmony = new Harmony(wsUrl, ChainType.Ethereum, ChainID.Geth)
+
+const wsHarmony = new Harmony(wsUrl, ChainType.Ethereum, ChainID.Geth)
+
+async function createAndEncrypt(words, index, password) {
+  for (let i = 0; i < index; i++) {
+    const newAcc = harmony.wallet.addByMnemonic(words, i)
+    await harmony.wallet.encryptAccount(newAcc.address, password)
+  }
+}
+
+const acc = harmony.wallet.addByMnemonic(mne, 0)
+
+console.log('--- hint: we use this private key to test with ganache')
+console.log('-------------------------------------')
+console.log(`${acc.privateKey}`)
+console.log('-------------------------------------')
+
+const server = ganache.server({
+  accounts: [{ secretKey: acc.privateKey, balance: '0x21e19e0c9bab2400000' }],
+  default_balance_ether: 10000,
+  gasLimit: '0x3000000',
+  allowUnlimitedContractSize: true
+})
+
+// now it is async time
+
+async function main() {
+  const password = '1234567890123'
+
+  await createAndEncrypt(mne, 10, password)
+
+  // harmony.blockchain.newPendingTransacitons();
+
+  const latestBalance = await harmony.blockchain.getBalance({
+    address: acc.address,
+    blockNumber: 'latest'
+  })
+  console.log('--- testing: hmy_getBalance')
+  console.log('-------------------------------------')
+  console.log({ balance: harmony.utils.hexToNumber(latestBalance.result) })
+  console.log('-------------------------------------')
+
+  const nonce = await harmony.blockchain.getTransactionCount({
+    address: harmony.wallet.signer.address,
+    blockNumber: 'latest'
+  })
+  console.log('--- testing: hmy_getTransactionCount')
+  console.log('-------------------------------------')
+  console.log({
+    nonce: Number.parseInt(harmony.utils.hexToNumber(nonce.result), 10)
+  })
+  console.log('-------------------------------------')
+
+  const balanceOfAccount = await harmony.wallet.signer.getBalance()
+
+  console.log('--- testing: Account.getBalance')
+  console.log('-------------------------------------')
+  console.log(balanceOfAccount)
+  console.log('-------------------------------------')
+
+  const sendTo = '0xccaed3f53bd0a55db215cc58182969e59d2242fe'
+
+  const txn = harmony.transactions.newTx({
+    to: sendTo,
+    value: new harmony.utils.Unit('1234567').asWei().toWei(),
+    gasLimit: new harmony.utils.Unit('21000').asWei().toWei(),
+    gasPrice: new harmony.utils.Unit('100000000000').asWei().toWei()
+  })
+
+  // now we sign and send a transaction
+
+  const signed = await harmony.wallet.signTransaction(txn, undefined, password)
+
+  console.log('--- testing: Account.signTransaction')
+  console.log('-------------------------------------')
+  console.log({ signedTransactionPayload: signed.txPayload })
+  console.log('-------------------------------------')
+
+  const [sentTxn, TranID] = await signed.sendTransaction()
+
+  console.log('--- testing: Transaction.sendTransaction')
+  console.log('-------------------------------------')
+  console.log({ TranID })
+  console.log('-------------------------------------')
+
+  const confirmed = await sentTxn.confirm(TranID, 20, 1000)
+
+  console.log('--- testing: Transaction.confirm')
+  console.log('-------------------------------------')
+  console.log({
+    confirmed: confirmed.isConfirmed(),
+    receipt: confirmed.receipt
+  })
+  console.log('-------------------------------------')
+
+  const latestBlock = await harmony.blockchain.getBlockByNumber({
+    blockNumber: 'latest'
+  })
+  console.log('--- testing: hmy_getBlockByNumber')
+  console.log('-------------------------------------')
+  console.log({ latestBlockHash: latestBlock.result.hash })
+  console.log('-------------------------------------')
+
+  const sameLatestBlock = await harmony.blockchain.getBlockByHash({
+    blockHash: latestBlock.result.hash
+  })
+  console.log('--- testing: hmy_getBlockByHash')
+  console.log('-------------------------------------')
+  console.log({ sameLatestBlockNumber: sameLatestBlock.result.number })
+  console.log('-------------------------------------')
+
+  const blockTransactionCount = await harmony.blockchain.getBlockTransactionCountByHash(
+    {
+      blockHash: latestBlock.result.hash
+    }
+  )
+  console.log('--- testing: hmy_getBlockTransactionCountByHash')
+  console.log('-------------------------------------')
+  console.log(blockTransactionCount.result)
+  console.log('-------------------------------------')
+
+  const sameBlockTransactionCount = await harmony.blockchain.getBlockTransactionCountByNumber(
+    {
+      blockNumber: latestBlock.result.number
+    }
+  )
+  console.log('--- testing: hmy_getBlockTransactionCountByNumber')
+  console.log('-------------------------------------')
+  console.log(sameBlockTransactionCount.result)
+  console.log('-------------------------------------')
+
+  const transaction = await harmony.blockchain.getTransactionByBlockHashAndIndex(
+    {
+      blockHash: latestBlock.result.hash,
+      index: '0x0'
+    }
+  )
+  console.log('--- testing: hmy_getTransactionByBlockHashAndIndex')
+  console.log('-------------------------------------')
+  console.log(transaction.result)
+  console.log('-------------------------------------')
+
+  const sameTransaction = await harmony.blockchain.getTransactionByBlockNumberAndIndex(
+    {
+      blockNumber: latestBlock.result.number,
+      index: '0x0'
+    }
+  )
+  console.log('--- testing: hmy_getTransactionByBlockNumberAndIndex')
+  console.log('-------------------------------------')
+  console.log({ gas: sameTransaction.result.gas })
+  console.log('-------------------------------------')
+
+  const sameTransaction2 = await harmony.blockchain.getTransactionByHash({
+    txnHash: transaction.result.hash
+  })
+  const { gas, gasPrice, value } = sameTransaction2.result
+  const valueBN = harmony.utils.hexToBN(value)
+  const gasBN = harmony.utils.hexToBN(gas)
+  const gasPriceBN = harmony.utils.hexToBN(gasPrice)
+  const actualCost = new harmony.utils.Unit(gasBN.mul(gasPriceBN).add(valueBN))
+    .asWei()
+    .toWei()
+  console.log('--- testing: hmy_getTransactionByHash')
+  console.log('-------------------------------------')
+  console.log({
+    actualCost: actualCost.toString(),
+    gas: harmony.utils.hexToNumber(gas),
+    gasPrice: gasPriceBN.toString(),
+    value: valueBN.toString(),
+    comment: 'actualCost= gas * gasPrice + value'
+  })
+  console.log('-------------------------------------')
+
+  const getBalanceAgainObject = await harmony.wallet.signer.getBalance()
+  console.log('--- testing: get balance again')
+  console.log('-------------------------------------')
+  console.log(getBalanceAgainObject)
+  console.log('-------------------------------------')
+
+  setTimeout(async () => {
+    const txn2 = harmony.transactions.clone(txn)
+    const s2 = await harmony.wallet.signTransaction(txn2, undefined, password)
+    const [sentTxn, TranID] = await s2.sendTransaction()
+    await sentTxn.confirm(TranID, 20, 1000)
+    console.log({
+      id: sentTxn.id,
+      blockNumbers: sentTxn.blockNumbers,
+      txStatus: sentTxn.txStatus,
+      confirmations: sentTxn.confirmations,
+      confirmationCheck: sentTxn.confirmationCheck
+    })
+  }, 5000)
+
+  setTimeout(async () => {
+    const txn3 = harmony.transactions.clone(txn)
+    const s3 = await harmony.wallet.signTransaction(txn3, undefined, password)
+    const [sentTxn, TranID] = await s3.sendTransaction()
+    await sentTxn.confirm(TranID, 20, 1000)
+    console.log({
+      id: sentTxn.id,
+      blockNumbers: sentTxn.blockNumbers,
+      txStatus: sentTxn.txStatus,
+      confirmations: sentTxn.confirmations,
+      confirmationCheck: sentTxn.confirmationCheck
+    })
+  }, 10000)
+  setTimeout(async () => {
+    const txns3 = harmony.transactions.clone(txn)
+    const s3 = await harmony.wallet.signTransaction(txns3, undefined, password)
+    const [sentTxn, TranID] = await s3.sendTransaction()
+    await sentTxn.confirm(TranID, 20, 1000)
+    console.log({
+      id: sentTxn.id,
+      blockNumbers: sentTxn.blockNumbers,
+      txStatus: sentTxn.txStatus,
+      confirmations: sentTxn.confirmations,
+      confirmationCheck: sentTxn.confirmationCheck
+    })
+  }, 15000)
+  setTimeout(async () => {
+    const txn4 = harmony.transactions.clone(txn)
+    const s4 = await harmony.wallet.signTransaction(txn4, undefined, password)
+    const [sentTxn, TranID] = await s4.sendTransaction()
+    await sentTxn.confirm(TranID, 20, 1000)
+    console.log({
+      id: sentTxn.id,
+      blockNumbers: sentTxn.blockNumbers,
+      txStatus: sentTxn.txStatus,
+      confirmations: sentTxn.confirmations,
+      confirmationCheck: sentTxn.confirmationCheck
+    })
+  }, 20000)
+  setTimeout(async () => {
+    const txn5 = harmony.transactions.clone(txn)
+    const s5 = await harmony.wallet.signTransaction(txn5, undefined, password)
+    const [sentTxn, TranID] = await s5.sendTransaction()
+    await sentTxn.confirm(TranID, 20, 1000)
+    console.log({
+      id: sentTxn.id,
+      blockNumbers: sentTxn.blockNumbers,
+      txStatus: sentTxn.txStatus,
+      confirmations: sentTxn.confirmations,
+      confirmationCheck: sentTxn.confirmationCheck
+    })
+  }, 25000)
+  setTimeout(async () => {
+    const txn6 = harmony.transactions.clone(txn)
+    const s6 = await harmony.wallet.signTransaction(txn6, undefined, password)
+    const [sentTxn, TranID] = await s6.sendTransaction()
+    await sentTxn.confirm(TranID, 20, 1000)
+    console.log({
+      id: sentTxn.id,
+      blockNumbers: sentTxn.blockNumbers,
+      txStatus: sentTxn.txStatus,
+      confirmations: sentTxn.confirmations,
+      confirmationCheck: sentTxn.confirmationCheck
+    })
+  }, 30000)
+}
+
+server.listen(port, function(err, blockchain) {
+  main()
+})
diff --git a/nodejs/testNode.js b/nodejs/testNode.js
new file mode 100644
index 0000000..96db374
--- /dev/null
+++ b/nodejs/testNode.js
@@ -0,0 +1,136 @@
+const { Harmony } = require('@harmony-js/core')
+// const ganache = require('ganache-cli');
+
+var port = 9015
+
+const url = `http://localhost:${port}`
+// const url = `https://testnet-rpc.thundercore.com:8544`;
+
+// we use ChainType=0 to indicate we are using `harmony node`
+// if we set it to 1, we use `eth` as our settings.
+// here 0 is by default, which means we use harmony-node by default.
+const harmony = new Harmony(url)
+
+const mne =
+  'food response winner warfare indicate visual hundred toilet jealous okay relief tornado'
+
+const acc = harmony.wallet.addByMnemonic(mne, 0)
+
+console.log('--- hint: please write these down')
+console.log('-------------------------------------')
+console.log(`${mne}`)
+console.log('-------------------------------------')
+
+console.log('--- hint: we use this private key to as default account to test')
+console.log('-------------------------------------')
+console.log(`${acc.privateKey}`)
+console.log('-------------------------------------')
+
+// now it is async time
+
+async function main() {
+  const latestBlock = await harmony.blockchain.getBlockByNumber({
+    blockNumber: 'latest'
+  })
+  console.log('--- testing: hmy_getBlockNumber')
+  console.log('-------------------------------------')
+  console.log(latestBlock.result)
+  console.log('-------------------------------------')
+
+  const sameLatestBlock = await harmony.blockchain.getBlockByHash({
+    blockHash: latestBlock.result.hash
+  })
+  console.log('--- testing: hmy_getBlockByHash')
+  console.log('-------------------------------------')
+  console.log(sameLatestBlock.result)
+  console.log('-------------------------------------')
+
+  const blockTransactionCount = await harmony.blockchain.getBlockTransactionCountByHash(
+    {
+      blockHash: latestBlock.result.hash
+    }
+  )
+  console.log('--- testing: hmy_getBlockTransactionCountByHash')
+  console.log('-------------------------------------')
+  console.log(blockTransactionCount.result)
+  console.log('-------------------------------------')
+
+  const sameBlockTransactionCount = await harmony.blockchain.getBlockTransactionCountByNumber(
+    {
+      blockNumber: latestBlock.result.number
+    }
+  )
+  console.log('--- testing: hmy_getBlockTransactionCountByNumber')
+  console.log('-------------------------------------')
+  console.log(sameBlockTransactionCount.result)
+  console.log('-------------------------------------')
+
+  const transaction = await harmony.blockchain.getTransactionByBlockHashAndIndex(
+    {
+      blockHash: latestBlock.result.hash,
+      index: '0x0'
+    }
+  )
+  console.log('--- testing: hmy_getTransactionByBlockHashAndIndex')
+  console.log('-------------------------------------')
+  console.log(transaction.result)
+  console.log('-------------------------------------')
+
+  const sameTransaction = await harmony.blockchain.getTransactionByBlockNumberAndIndex(
+    {
+      blockNumber: latestBlock.result.number,
+      index: '0x0'
+    }
+  )
+  console.log('--- testing: hmy_getTransactionByBlockNumberAndIndex')
+  console.log('-------------------------------------')
+  console.log(sameTransaction.result)
+  console.log('-------------------------------------')
+
+  const sameTransaction2 = await harmony.blockchain.getTransactionByHash({
+    txnHash: transaction.result.hash
+  })
+  console.log('--- testing: hmy_getTransactionByHash')
+  console.log('-------------------------------------')
+  console.log(sameTransaction2.result)
+  console.log('-------------------------------------')
+
+  const latestBalance = await harmony.blockchain.getBalance({
+    address: acc.address,
+    blockNumber: latestBlock.result.number
+  })
+  console.log('--- testing: hmy_getBalance')
+  console.log('-------------------------------------')
+  console.log({ balance: harmony.utils.hexToNumber(latestBalance.result) })
+  console.log('-------------------------------------')
+
+  const latestBalance2 = await harmony.blockchain.getBalance({
+    address: acc.address,
+    blockNumber: 'latest'
+  })
+  console.log(
+    '--- testing: force blockNumber to "latest", should get same result as above'
+  )
+  console.log('-------------------------------------')
+  console.log({ balance: harmony.utils.hexToNumber(latestBalance2.result) })
+  console.log('-------------------------------------')
+
+  const nonce = await harmony.blockchain.getTransactionCount({
+    address: acc.address,
+    blockNumber: latestBlock.result.number
+  })
+  console.log('--- testing: hmy_getTransactionCount')
+  console.log('-------------------------------------')
+  console.log({
+    nonce: Number.parseInt(harmony.utils.hexToNumber(nonce.result), 10)
+  })
+  console.log('-------------------------------------')
+
+  const balanceOfAccount = await acc.getBalance()
+  console.log('--- testing: Account.getBalance')
+  console.log('-------------------------------------')
+  console.log(balanceOfAccount)
+  console.log('-------------------------------------')
+}
+
+main()
diff --git a/nodejs/testWallet.js b/nodejs/testWallet.js
new file mode 100644
index 0000000..1e5a391
--- /dev/null
+++ b/nodejs/testWallet.js
@@ -0,0 +1,32 @@
+const { Harmony } = require('@harmony-js/core')
+
+const harmony = new Harmony('https://localhost:9015')
+
+async function createAndEncrypt(words, index, password) {
+  for (let i = 0; i < index; i++) {
+    const newAcc = harmony.wallet.addByMnemonic(words, i)
+    await harmony.wallet.encryptAccount(newAcc.address, password)
+  }
+}
+
+async function main() {
+  // const mne = harmony.wallet.generateMnemonic();
+  const mne =
+    'food response winner warfare indicate visual hundred toilet jealous okay relief tornado'
+  const password = '1234567890123'
+  console.log('---hint: please write these down')
+  console.log(`${mne}`)
+
+  console.log('---hint: we use simple password to encrypt your wallet')
+  console.log(`${password}`)
+
+  await createAndEncrypt(mne, 10, password)
+  console.log('---hint:we added 10 accounts for you')
+
+  console.log(harmony.wallet.accounts)
+
+  console.log('---hint:now the signer has been encrypted')
+  console.log(harmony.wallet.signer.privateKey)
+}
+
+main()
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3cf2a5d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "harmony-sdk-examples",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "dependencies": {
+    "@harmony-js/core": "^0.0.15"
+  },
+  "devDependencies": {
+    "ganache-cli": "^6.4.3",
+    "solc": "^0.5.8",
+    "tslib": "^1.9.3"
+  }
+}
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..c583ac0
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,965 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@harmony-js/account@0.0.15":
+  version "0.0.15"
+  resolved "https://registry.npmjs.org/@harmony-js/account/-/account-0.0.15.tgz#a86263f2267a9560a3974077aec7cecf5b8540a1"
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+  dependencies:
+    "@harmony-js/core" "0.0.15"
+    "@harmony-js/crypto" "0.0.15"
+    "@harmony-js/network" "0.0.15"
+    "@harmony-js/transaction" "0.0.15"
+    "@harmony-js/utils" "0.0.15"
+
+"@harmony-js/contract@0.0.15":
+  version "0.0.15"
+  resolved "https://registry.npmjs.org/@harmony-js/contract/-/contract-0.0.15.tgz#f643e22967b081b7c7d966f85631b9b7545a4717"
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+  dependencies:
+    "@harmony-js/account" "0.0.15"
+    "@harmony-js/crypto" "0.0.15"
+    "@harmony-js/network" "0.0.15"
+    "@harmony-js/transaction" "0.0.15"
+    "@harmony-js/utils" "0.0.15"
+
+"@harmony-js/core@0.0.15", "@harmony-js/core@^0.0.15":
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+  resolved "https://registry.npmjs.org/@harmony-js/core/-/core-0.0.15.tgz#71c0b1c5ff598013498bde8536a5970953d303e3"
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+  dependencies:
+    "@harmony-js/account" "0.0.15"
+    "@harmony-js/contract" "0.0.15"
+    "@harmony-js/crypto" "0.0.15"
+    "@harmony-js/network" "0.0.15"
+    "@harmony-js/transaction" "0.0.15"
+    "@harmony-js/utils" "0.0.15"
+
+"@harmony-js/crypto@0.0.15":
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+  dependencies:
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+    base-x "^3.0.5"
+    bip39 "^2.5.0"
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+    elliptic "^6.4.1"
+    hdkey "^1.1.1"
+    hmac-drbg "^1.0.1"
+    js-sha3 "^0.8.0"
+    pbkdf2 "^3.0.17"
+    scrypt.js "^0.3.0"
+    uuid "^3.3.2"
+
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+  resolved "https://registry.npmjs.org/@harmony-js/network/-/network-0.0.15.tgz#8e59f2f1bf93b63c4bacc8e11db9d341864bbf7a"
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+  dependencies:
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+    "@harmony-js/utils" "0.0.15"
+    cross-fetch "^3.0.2"
+    mitt "^1.1.3"
+    websocket "^1.0.28"
+
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+    "@harmony-js/crypto" "0.0.15"
+    "@harmony-js/network" "0.0.15"
+    "@harmony-js/utils" "0.0.15"
+
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+  dependencies:
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+  dependencies:
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+    cipher-base "^1.0.0"
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+    inherits "^2.0.1"
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