diff --git a/server-api/app.js b/server-api/app.js
index cb54a4d..d0fa884 100644
--- a/server-api/app.js
+++ b/server-api/app.js
@@ -6,6 +6,7 @@ const fs = require('fs');
 const config = require('./config.json');
 // custom modules
 const mysql = require('./libs/mysql_pool');
+const so = require('./libs/storeObject');
 
 // init mysql connection pool
 mysql.database = config.db.mysql.dbname;
@@ -67,5 +68,6 @@ const api_route = require('./route/api');
 router.use("/api", api_route.routes());
 
 router.get('/', async(c, n) => {
+    console.log(so.show());
     c.body = 'Get root';
 });
\ No newline at end of file
diff --git a/server-api/config.json.default b/server-api/config.json.default
index 4de3283..290634d 100644
--- a/server-api/config.json.default
+++ b/server-api/config.json.default
@@ -14,5 +14,9 @@
             "port": 27017,
             "dbname": "lora"
         }
+    },
+    "memcached": {
+        "host": "localhost",
+        "port": 11211
     }
 }
\ No newline at end of file
diff --git a/server-api/libs/memcache_lib.js b/server-api/libs/memcache_lib.js
new file mode 100644
index 0000000..f955707
--- /dev/null
+++ b/server-api/libs/memcache_lib.js
@@ -0,0 +1,48 @@
+const Memcached = require('memcached');
+
+class memcachedLib {
+    constructor() {
+        this._host = ''
+        this._port = ''
+        this._expire = 86400
+        this._conn = null;
+    }
+
+    connect() {
+        this._conn = new Memcached(`${this._host}:${this._port}`)
+    }
+
+    /**
+     * set object to memcached
+     * @param {string} key 
+     * @param {string} val 
+     * @param {number} expire 
+     */
+    setVal(key, val, expire = this._expire) {
+        return new Promise((resolve, reject) => {
+            this._conn.set(key, val, err => {
+                if (err) return reject(err);
+                return resolve(null);
+            })
+        })
+    }
+
+    /**
+     * get object from memcached
+     * @param {string} key 
+     */
+    getVal(key) {
+        return new Promise((resolve, reject) => {
+            this._conn.get(key, (err, data) => {
+                if (err) return reject(err);
+                return resolve(data);
+            })
+        })
+    }
+
+    set host(str) { this._host = str }
+    set port(str) { this._port = str }
+    set expire(str) { this._expire = str }
+}
+
+module.exports = new memcachedLib();
\ No newline at end of file
diff --git a/server-api/libs/storeObject.js b/server-api/libs/storeObject.js
new file mode 100644
index 0000000..11ed6bc
--- /dev/null
+++ b/server-api/libs/storeObject.js
@@ -0,0 +1,68 @@
+const StoreObj = (() => {
+
+    let memStore = {};
+    let maxAge = 86400000;
+
+    /**
+     * @param {string} uuid
+     * @param {object} obj
+     */
+    const set = (uuid, obj) => {
+        memStore[uuid] = {
+            obj,
+            age: Date.now() + maxAge
+        }
+    }
+
+    /**
+     * @param {string} uuid
+     */
+    const get = (uuid) => {
+        if (uuid in memStore) {
+            let s = memStore[uuid];
+            if (Date.now() < s.age) {
+                s.age = Date.now() + maxAge;
+                return s.obj;
+            } else {
+                delete memStore[uuid];
+            }
+        }
+        return null;
+    }
+
+    /**
+     * @param {string} uuid
+     */
+    const chkKey = (uuid) => {
+        if (uuid in memStore) return true;
+        return false;
+    }
+
+    /**
+     * @param {string} uuid
+     */
+    const del = (uuid) => {
+        if (uuid in memStore) delete memStore[uuid];
+    }
+
+    const clear = () => {
+        let t = Date.now();
+        for (var i in memStore) {
+            let s = memStore[i];
+            if (s.age < t) delete memStore[i];
+        }
+    }
+
+    /**
+     * @param {string} uuid if not input return all 
+     */
+    const show = (uuid) => {
+        if (uuid && uuid in memStore) return memStore[uuid];
+
+        return memStore;
+    }
+
+    return {set, get, chkKey, clear, del, show };
+})()
+
+module.exports = StoreObj;
\ No newline at end of file
diff --git a/server-api/package.json b/server-api/package.json
index 0fdc743..5df82d8 100644
--- a/server-api/package.json
+++ b/server-api/package.json
@@ -12,6 +12,7 @@
     "koa-router": "^7.2.0",
     "koa-session": "^5.0.0",
     "koa-static": "^3.0.0",
+    "memcached": "^2.2.2",
     "mysql": "^2.13.0"
   }
 }
diff --git a/server-api/route/api/index.js b/server-api/route/api/index.js
index 66fe75f..8a65988 100644
--- a/server-api/route/api/index.js
+++ b/server-api/route/api/index.js
@@ -4,6 +4,7 @@ const koaBody = require('koa-body');
 
 // import tools 
 const mysql = require('../../libs/mysql_pool.js');
+const so = require('../../libs/storeObject');
 const config = require('../../config.json');
 
 // routes 
diff --git a/server-api/route/api/user.js b/server-api/route/api/user.js
index dc6f7bc..0e4aec8 100644
--- a/server-api/route/api/user.js
+++ b/server-api/route/api/user.js
@@ -3,6 +3,7 @@ const router = new Router();
 
 // import tools 
 const crypto = require('../../libs/crypto.js');
+const so = require('../../libs/storeObject');
 
 router
     .post('/login', async(c, n) => {
@@ -25,6 +26,14 @@ router
         } catch (err) {
             return c.body = 'DB Query Error';
         }
+
+        let u = c.body.record[0];
+        let uuid = null;
+        while (true) {
+            uuid = crypto.random(10);
+            if (!so.chkKey(uuid)) { break; }
+        }
+        so.set(uuid, u);
     })
 
 module.exports = router;
\ No newline at end of file
diff --git a/server-api/yarn.lock b/server-api/yarn.lock
index 2875a71..d8677ac 100644
--- a/server-api/yarn.lock
+++ b/server-api/yarn.lock
@@ -38,6 +38,10 @@ co@^4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
 
+connection-parse@0.0.x:
+  version "0.0.7"
+  resolved "https://registry.yarnpkg.com/connection-parse/-/connection-parse-0.0.7.tgz#18e7318aab06a699267372b10c5226d25a1c9a69"
+
 content-disposition@~0.5.0:
   version "0.5.2"
   resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-0.5.2.tgz#0cf68bb9ddf5f2be7961c3a85178cb85dba78cb4"
@@ -103,6 +107,13 @@ fresh@^0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/fresh/-/fresh-0.5.0.tgz#f474ca5e6a9246d6fd8e0953cfa9b9c805afa78e"
 
+hashring@3.2.x:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/hashring/-/hashring-3.2.0.tgz#fda4efde8aa22cdb97fb1d2a65e88401e1c144ce"
+  dependencies:
+    connection-parse "0.0.x"
+    simple-lru-cache "0.0.x"
+
 http-assert@^1.1.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/http-assert/-/http-assert-1.3.0.tgz#a31a5cf88c873ecbb5796907d4d6f132e8c01e4a"
@@ -147,6 +158,12 @@ isarray@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"
 
+jackpot@>=0.0.6:
+  version "0.0.6"
+  resolved "https://registry.yarnpkg.com/jackpot/-/jackpot-0.0.6.tgz#3cff064285cbf66f4eab2593c90bce816a821849"
+  dependencies:
+    retry "0.6.0"
+
 kcors@2:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/kcors/-/kcors-2.2.1.tgz#7160a94f2eae633436d2cef8eadd0ce232386779"
@@ -252,6 +269,13 @@ media-typer@0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/media-typer/-/media-typer-0.3.0.tgz#8710d7af0aa626f8fffa1ce00168545263255748"
 
+memcached@^2.2.2:
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/memcached/-/memcached-2.2.2.tgz#68f86ccfd84bcf93cc25ed46d6d7fc0c7521c9d5"
+  dependencies:
+    hashring "3.2.x"
+    jackpot ">=0.0.6"
+
 methods@^1.0.1:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
@@ -364,6 +388,10 @@ resolve-path@^1.3.1:
     http-errors "~1.5.0"
     path-is-absolute "1.0.1"
 
+retry@0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/retry/-/retry-0.6.0.tgz#1c010713279a6fd1e8def28af0c3ff1871caa537"
+
 setprototypeof@1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/setprototypeof/-/setprototypeof-1.0.2.tgz#81a552141ec104b88e89ce383103ad5c66564d08"
@@ -372,6 +400,10 @@ setprototypeof@1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/setprototypeof/-/setprototypeof-1.0.3.tgz#66567e37043eeb4f04d91bd658c0cbefb55b8e04"
 
+simple-lru-cache@0.0.x:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/simple-lru-cache/-/simple-lru-cache-0.0.2.tgz#d59cc3a193c1a5d0320f84ee732f6e4713e511dd"
+
 sqlstring@2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/sqlstring/-/sqlstring-2.2.0.tgz#c3135c4ea8abcd7e7ee741a4966a891d86a4f191"