diff --git a/README.md b/README.md
index 5f1f1a3..e69de29 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +0,0 @@
-# node-electrum-client
-
-## electrum protocol
-
-* http://docs.electrum.org/en/latest/protocol.html
diff --git a/example/ex.js b/example/ex.js
new file mode 100644
index 0000000..9ee12a8
--- /dev/null
+++ b/example/ex.js
@@ -0,0 +1,25 @@
+const Client = require("../lib/electrum_cli")
+
+const proc = async(cl) => {
+    try{
+        const version = await cl.server_version("2.7.11", "1.0")
+        console.log(version)
+        const balance = await cl.blockchainAddress_getBalance("MS43dMzRKfEs99Q931zFECfUhdvtWmbsPt")
+        console.log(balance)
+        const utxo = await cl.blockchainAddress_listunspent("MS43dMzRKfEs99Q931zFECfUhdvtWmbsPt")
+        console.log(utxo)
+    }catch(e){
+        console.log(e)
+    }
+}
+
+const main = async(port, host) => {
+    const cl = new Client(port, host);
+    await cl.connect()
+    for(let i = 0; i<100; ++i){
+        await proc(cl)
+    }
+    await cl.close()
+}
+
+main(4444, "localhost")
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..e1250b0
--- /dev/null
+++ b/index.js
@@ -0,0 +1 @@
+module.exports = require('./lib/client');
diff --git a/lib/client.js b/lib/client.js
new file mode 100644
index 0000000..7334d65
--- /dev/null
+++ b/lib/client.js
@@ -0,0 +1,92 @@
+'use strict'
+const net = require('net');
+const util = require('./util');
+
+class MessageParser{
+    constructor(callback){
+        this.buffer = ''
+        this.callback = callback
+    }
+    run(chunk){
+        this.buffer += chunk
+        while(true){
+            const res = util.recursiveParser(0, this.buffer, this.callback)
+            this.buffer = res.buffer
+            if(res.code === 0){
+                break;
+            }
+        }
+    }
+}
+
+class Client{
+    constructor(port, host){
+        this.port = port
+        this.host = host
+        this.hostname = [host, port].join(':')
+        this.callback_message_queue = {}
+        this.id = 0;
+
+        this.mp = new MessageParser((body, n) => {
+            this.onMessageRecv(JSON.parse(body));
+        });
+
+        const conn = this.conn = new net.Socket()
+        conn.setEncoding('utf8')
+        conn.setKeepAlive(true, 0)
+        conn.setNoDelay(true)
+        conn.on('connect', () => {
+        })
+        conn.on('close', () => {
+            Object.keys(this.callback_message_queue).forEach((key) => {
+                this.callback_message_queue[key](new Error('close connect'))
+                delete this.callback_message_queue[key]
+            })
+        })
+        conn.on('data', (chunk) => {
+            this.mp.run(chunk)
+        })
+        conn.on('end', () => {
+        })
+    }
+
+    connect(){
+        return new Promise((resolve, reject) => {
+            this.conn.connect(this.port, this.host, () => {
+                resolve()
+            })
+        })
+    }
+
+    close(){
+        this.conn.end();
+        this.conn.destroy();
+    }
+
+    onMessageRecv(msg){
+        if(msg instanceof Array){
+            ; // don't support batch request
+        } else {
+            const callback = this.callback_message_queue[msg.id]
+            if(callback){
+                delete this.callback_message_queue[msg.id]
+                if(msg.error){
+                    callback(msg.error)
+                }else{
+                    callback(null, msg.result)
+                }
+            }
+        }
+    }
+
+    request(method, params){
+        return new Promise((resolve, reject) => {
+            const id = ++this.id;
+            const content = util.makeRequest(method, params, id);
+            this.callback_message_queue[id] = util.createPromiseResult(resolve, reject);
+            this.conn.write(content + '\n');
+        })
+    }
+}
+
+module.exports = Client
diff --git a/lib/electrum_cli.js b/lib/electrum_cli.js
new file mode 100644
index 0000000..f39f78e
--- /dev/null
+++ b/lib/electrum_cli.js
@@ -0,0 +1,65 @@
+const Client = require("./client")
+class ElectrumCli extends Client{
+    constructor(port, host){
+        super(port, host)
+    }
+    server_version(client_name, protocol_version){
+        return this.request('server.version', [client_name, protocol_version])
+    }
+    server_banner(){
+        return this.request('server.banner', [])
+    }
+    serverDonation_address(){
+        return this.request('server.donation_address', [])
+    }
+    serverPeers_subscribe(){
+        return this.request('server.peers.subscribe', [])
+    }
+    blockchainAddress_getBalance(address){
+        return this.request('blockchain.address.get_balance', [address])
+    }
+    blockchainAddress_getHistory(address){
+        return this.request('blockchain.address.get_history', [address])
+    }
+    blockchainAddress_getMempool(address){
+        return this.request('blockchain.address.get_mempool', [address])
+    }
+    blockchainAddress_getProof(address){
+        return this.request('blockchain.address.get_proof', [address])
+    }
+    blockchainAddress_listunspent(address){
+        return this.request('blockchain.address.listunspent', [address])
+    }
+    blockchainBlock_getHeader(height){
+        return this.request('blockchain.block.get_header', [height])
+    }
+    blockchainBlock_getChunk(index){
+        return this.request('blockchain.block.get_chunk', [index])
+    }
+    blockchainEstimatefee(number){
+        return this.request('blockchain.estimatefee', [number])
+    }
+    blockchainHeaders_subscribe(){
+        return this.request('blockchain.headers.subscribe', [])
+    }
+    blockchainNumblocks_subscribe(){
+        return this.request('blockchain.numblocks.subscribe', [])
+    }
+    blockchain_relayfee(){
+        return this.request('blockchain.relayfee', [])
+    }
+    blockchainTransaction_broadcast(rawtx){
+        return this.request('blockchain.transaction.broadcast', [rawtx])
+    }
+    blockchainTransaction_get(tx_hash, height){
+        return this.request('blockchain.transaction.get', [tx_hash, height])
+    }
+    blockchainTransaction_getMerkle(tx_hash, height){
+        return this.request('blockchain.transaction.get_merkle', [tx_hash, height])
+    }
+    blockchainUtxo_getAddress(tx_hash, index){
+        return this.request('blockchain.utxo.get_address', [tx_hash, index])
+    }
+}
+
+module.exports = ElectrumCli
diff --git a/lib/util.js b/lib/util.js
new file mode 100644
index 0000000..cac3b83
--- /dev/null
+++ b/lib/util.js
@@ -0,0 +1,36 @@
+'use strict'
+
+const makeRequest = exports.makeRequest = (method, params, id) => {
+    return JSON.stringify({
+        jsonrpc : "2.0",
+        method : method,
+        params : params,
+        id : id,
+    })
+}
+
+const recursiveParser = exports.recursiveParser = (n, buffer, callback) => {
+    const MAX_DEPTH = 20;
+    if(buffer.length === 0) {
+        return {code:0, buffer:buffer}
+    }
+    if(n > MAX_DEPTH) {
+        return {code:1, buffer:buffer}
+    }
+    const xs = buffer.split('\n')
+    if(xs.length === 1){
+        return {code:0, buffer:buffer}
+    }
+    const content = xs.shift()
+
+    callback(content, n)
+    return recursiveParser(n + 1, xs.join('\n'), callback)
+}
+
+const createPromiseResult = exports.createPromiseResult = (resolve, reject) => {
+    return (err, result) => {
+        if(err) reject(err)
+        else resolve(result)
+    }
+}
+
diff --git a/package.json b/package.json
index 487dda7..48b7727 100644
--- a/package.json
+++ b/package.json
@@ -1,22 +1,13 @@
 {
   "name": "electrum-client",
-  "version": "1.0.0",
-  "description": "## electrum protocol",
+  "version": "0.0.1",
+  "description": "",
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/you21979/node-electrum-client.git"
-  },
   "dependencies": {
-    "stratum": ""
   },
-  "author": "",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/you21979/node-electrum-client/issues"
-  },
-  "homepage": "https://github.com/you21979/node-electrum-client#readme"
+  "author": "Yuki Akiyama",
+  "license": "MIT"
 }