diff --git a/src/renderer/components/Login/InstanceForm.vue b/src/renderer/components/Login/InstanceForm.vue
deleted file mode 100644
index 6b3c54e5..00000000
--- a/src/renderer/components/Login/InstanceForm.vue
+++ /dev/null
@@ -1,57 +0,0 @@
-<template>
-<div id="instance_form">
-  <el-form ref="instanceForm" label-width="120px" label-position="top" class="instance-form" v-on:submit.prevent="search">
-    <el-form-item label="Domain name">
-      <el-input v-model="instanceForm.domain" class="input" ref="domain" autofocus></el-input>
-    </el-form-item>
-    <el-form-item class="submit">
-      <el-button type="primary" @click="search" native-type="submit">Search</el-button>
-    </el-form-item>
-  </el-form>
-</div>
-</template>
-
-<script>
-export default {
-  name: 'instance-form',
-  data () {
-    return {
-      instanceForm: {
-        domain: ''
-      }
-    }
-  },
-  mounted () {
-    this.$refs.domain.$el.getElementsByTagName('input')[0].focus()
-  },
-  methods: {
-    search () {
-      const loading = this.$loading({
-        lock: true,
-        text: 'Loading',
-        spinner: 'el-icon-loading',
-        background: 'rgba(0, 0, 0, 0.7)'
-      })
-      this.$store.dispatch('Login/searchInstance', this.instanceForm.domain)
-        .then(() => {
-          loading.close()
-          this.$store.commit('Login/changePage', 2)
-        })
-        .catch(() => {
-          loading.close()
-          this.$message({
-            message: 'Instance not found',
-            type: 'error'
-          })
-        })
-    }
-  }
-}
-</script>
-
-<style lang="scss" scoped>
-.instance-form {
-  width: 400px;
-  margin: 0 auto;
-}
-</style>
diff --git a/src/renderer/components/Login/LoginForm.vue b/src/renderer/components/Login/LoginForm.vue
index 72c7304a..47f9a66f 100644
--- a/src/renderer/components/Login/LoginForm.vue
+++ b/src/renderer/components/Login/LoginForm.vue
@@ -1,7 +1,7 @@
 <template>
-  <el-form ref="loginForm" label-width="120px" label-position="top" v-on:submit.prevent="confirm" class="login-form">
-    <el-form-item label="First, let's log in to a Mastodon instance. Please enter an instance domain name.">
-      <el-input v-model="domainName" placeholder="mastodon.social"></el-input>
+  <el-form ref="loginForm" label-width="120px" label-position="top" v-on:submit.prevent="confirm('loginForm')" class="login-form" :rules="rules" :model="form">
+    <el-form-item label="First, let's log in to a Mastodon instance. Please enter an instance domain name." prop="domainName">
+      <el-input v-model="form.domainName" placeholder="mastodon.social"></el-input>
     </el-form-item>
     <!-- Dummy form to guard submitting with enter -->
     <el-form-item class="hidden">
@@ -9,7 +9,7 @@
     </el-form-item>
     <el-button
       type="primary"
-      @click="confirm"
+      @click="confirm('loginForm')"
       v-if="selectedInstance === null"
       v-loading="searching"
       element-loading-background="rgba(0, 0, 0, 0.8)">
@@ -32,19 +32,32 @@ import { mapState } from 'vuex'
 
 export default {
   name: 'login-form',
+  data () {
+    return {
+      form: {
+        domainName: ''
+      },
+      rules: {
+        domainName: [
+          {
+            type: 'string',
+            required: true,
+            message: 'Domain name is required'
+          },
+          {
+            pattern: /^[a-zA-Z0-9][a-zA-Z0-9-]{1,61}[a-zA-Z0-9]\.[a-zA-Z]{2,}$/,
+            trigger: 'change',
+            message: 'Please write only domain name'
+          }
+        ]
+      }
+    }
+  },
   computed: {
     ...mapState({
       selectedInstance: state => state.Login.selectedInstance,
       searching: state => state.Login.searching
-    }),
-    domainName: {
-      get () {
-        return this.$store.state.Login.domainName
-      },
-      set (value) {
-        this.$store.dispatch('Login/updateDomainName', value)
-      }
-    }
+    })
   },
   methods: {
     login () {
@@ -68,20 +81,30 @@ export default {
           })
         })
     },
-    confirm () {
-      this.$store.dispatch('Login/confirmInstance', this.domainName)
-        .then(() => {
+    confirm (formName) {
+      this.$refs[formName].validate((valid) => {
+        if (valid) {
+          this.$store.dispatch('Login/confirmInstance', this.form.domainName)
+            .then(() => {
+              this.$message({
+                message: `${this.form.domainName} is confirmed, please login`,
+                type: 'success'
+              })
+            })
+            .catch(() => {
+              this.$message({
+                message: `${this.form.domainName} does not exist`,
+                type: 'error'
+              })
+            })
+        } else {
           this.$message({
-            message: `${this.domainName} is confirmed, please login`,
-            type: 'success'
-          })
-        })
-        .catch(() => {
-          this.$message({
-            message: `${this.domainName} does not exist`,
+            message: 'Please write only domain name',
             type: 'error'
           })
-        })
+          return false
+        }
+      })
     }
   }
 }
diff --git a/src/renderer/store/Login.js b/src/renderer/store/Login.js
index 04b63ed1..fa4e71bf 100644
--- a/src/renderer/store/Login.js
+++ b/src/renderer/store/Login.js
@@ -5,50 +5,18 @@ const Login = {
   namespaced: true,
   state: {
     instances: [],
-    domainName: '',
     selectedInstance: null,
-    page: 2,
     searching: false
   },
   mutations: {
-    updateInstances (state, instances) {
-      state.instances = instances
-    },
     changeInstance (state, instance) {
       state.selectedInstance = instance
     },
-    changePage (state, page) {
-      // Invalidate page changer until implement instance search form
-      // state.page = page
-    },
-    updateDomainName (state, domain) {
-      state.domainName = domain
-    },
     changeSearching (state, value) {
       state.searching = value
     }
   },
   actions: {
-    searchInstance ({ commit }, domain) {
-      return new Promise((resolve, reject) => {
-        ipcRenderer.send('get-social-token', 'get')
-        ipcRenderer.once('error-get-social-token', (event, err) => {
-          ipcRenderer.removeAllListeners('response-get-social-token')
-          reject(err)
-        })
-        ipcRenderer.once('response-get-social-token', (event, token) => {
-          ipcRenderer.removeAllListeners('error-get-social-token')
-          axios
-            .get(`https://instances.social/api/1.0/instances/search?q=${domain}`, {
-              'headers': { 'Authorization': `Bearer ${token}` }
-            })
-            .then((res) => {
-              commit('updateInstances', res.data.instances)
-              resolve(res)
-            })
-        })
-      })
-    },
     fetchLogin ({ commit }, instance) {
       return new Promise((resolve, reject) => {
         ipcRenderer.send('get-auth-url', instance)
@@ -62,14 +30,8 @@ const Login = {
         })
       })
     },
-    changeInstance ({ commit }, instance) {
-      commit('changeInstance', instance)
-    },
     pageBack ({ commit }) {
-      commit('changePage', 1)
-      commit('updateInstances', [])
       commit('changeInstance', null)
-      commit('updateDomainName', '')
     },
     confirmInstance ({ commit }, domain) {
       return new Promise((resolve, reject) => {
@@ -77,19 +39,13 @@ const Login = {
         axios
           .get(`https://${domain}/api/v1/instance`)
           .then((res) => {
-            commit('changeSearching', false)
             commit('changeInstance', domain)
             resolve(res)
           })
-          .catch((err) => {
+          .finally(() => {
             commit('changeSearching', false)
-            reject(err)
           })
       })
-    },
-    updateDomainName ({ commit }, domain) {
-      commit('updateDomainName', domain)
-      commit('changeInstance', null)
     }
   }
 }