diff --git a/src/settings/actions/index.js b/src/settings/actions/index.js
index 8c212c2..016f2a5 100644
--- a/src/settings/actions/index.js
+++ b/src/settings/actions/index.js
@@ -1,4 +1,7 @@
 export default {
   // Settings
   SETTING_SET_SETTINGS: 'setting.set.settings',
+  SETTING_SHOW_ERROR: 'setting.show.error',
+  SETTING_SWITCH_TO_FORM: 'setting.switch.to.form',
+  SETTING_SWITCH_TO_JSON: 'setting.switch.to.json',
 };
diff --git a/src/settings/actions/setting.js b/src/settings/actions/setting.js
index 1219ba5..3bb24be 100644
--- a/src/settings/actions/setting.js
+++ b/src/settings/actions/setting.js
@@ -1,8 +1,9 @@
 import actions from 'settings/actions';
 import messages from 'shared/messages';
-import DefaultSettings from 'shared/settings/default';
-import * as settingsStorage from 'shared/settings/storage';
+import * as validator from 'shared/settings/validator';
+import KeymapsForm from '../components/form/keymaps-form';
 import * as settingsValues from 'shared/settings/values';
+import * as settingsStorage from 'shared/settings/storage';
 
 const load = async() => {
   let settings = await settingsStorage.loadRaw();
@@ -10,6 +11,18 @@ const load = async() => {
 };
 
 const save = async(settings) => {
+  try {
+    if (settings.source === 'json') {
+      let value = JSON.parse(settings.json);
+      validator.validate(value);
+    }
+  } catch (e) {
+    return {
+      type: actions.SETTING_SHOW_ERROR,
+      error: e.toString(),
+      json: settings.json,
+    };
+  }
   await settingsStorage.save(settings);
   await browser.runtime.sendMessage({
     type: messages.SETTINGS_RELOAD
@@ -17,21 +30,39 @@ const save = async(settings) => {
   return set(settings);
 };
 
-const set = (settings) => {
-  let value = JSON.parse(DefaultSettings.json);
-  if (settings.source === 'json') {
-    value = settingsValues.valueFromJson(settings.json);
-  } else if (settings.source === 'form') {
-    value = settingsValues.valueFromForm(settings.form);
+const switchToForm = (json) => {
+  try {
+    validator.validate(JSON.parse(json));
+    // AllowdOps filters operations, this is dirty dependency
+    let form = settingsValues.formFromJson(json, KeymapsForm.AllowdOps);
+    return {
+      type: actions.SETTING_SWITCH_TO_FORM,
+      form,
+    };
+  } catch (e) {
+    return {
+      type: actions.SETTING_SHOW_ERROR,
+      error: e.toString(),
+      json,
+    };
   }
+};
 
+const switchToJson = (form) => {
+  let json = settingsValues.jsonFromForm(form);
+  return {
+    type: actions.SETTING_SWITCH_TO_JSON,
+    json,
+  };
+};
+
+const set = (settings) => {
   return {
     type: actions.SETTING_SET_SETTINGS,
     source: settings.source,
     json: settings.json,
     form: settings.form,
-    value,
   };
 };
 
-export { load, save };
+export { load, save, switchToForm, switchToJson };
diff --git a/src/settings/components/index.jsx b/src/settings/components/index.jsx
index c479986..66dc940 100644
--- a/src/settings/components/index.jsx
+++ b/src/settings/components/index.jsx
@@ -1,5 +1,6 @@
 import './site.scss';
 import { h, Component } from 'preact';
+import { connect } from 'preact-redux';
 import Input from './ui/input';
 import SearchForm from './form/search-form';
 import KeymapsForm from './form/keymaps-form';
@@ -7,63 +8,36 @@ import BlacklistForm from './form/blacklist-form';
 import PropertiesForm from './form/properties-form';
 import * as properties from 'shared/settings/properties';
 import * as settingActions from 'settings/actions/setting';
-import * as validator from 'shared/settings/validator';
-import * as settingsValues from 'shared/settings/values';
 
 const DO_YOU_WANT_TO_CONTINUE =
   'Some settings in JSON can be lost when migrating.  ' +
   'Do you want to continue?';
 
 class SettingsComponent extends Component {
-  constructor(props, context) {
-    super(props, context);
-
-    this.state = {
-      settings: {
-        json: '',
-      },
-      errors: {
-        json: '',
-      }
-    };
-    this.context.store.subscribe(this.stateChanged.bind(this));
-  }
-
   componentDidMount() {
-    this.context.store.dispatch(settingActions.load());
-  }
-
-  stateChanged() {
-    let settings = this.context.store.getState();
-    this.setState({
-      settings: {
-        source: settings.source,
-        json: settings.json,
-        form: settings.form,
-      }
-    });
+    this.props.dispatch(settingActions.load());
   }
 
-  renderFormFields() {
+  renderFormFields(form) {
     return <div>
       <fieldset>
         <legend>Keybindings</legend>
         <KeymapsForm
-          value={this.state.settings.form.keymaps}
+          value={form.keymaps}
           onChange={value => this.bindForm('keymaps', value)}
         />
       </fieldset>
       <fieldset>
         <legend>Search Engines</legend>
         <SearchForm
-          value={this.state.settings.form.search}
+          value={form.search}
           onChange={value => this.bindForm('search', value)}
         />
       </fieldset>
       <fieldset>
         <legend>Blacklist</legend>
         <BlacklistForm
-          value={this.state.settings.form.blacklist}
+          value={form.blacklist}
           onChange={value => this.bindForm('blacklist', value)}
         />
       </fieldset>
@@ -71,33 +45,33 @@ class SettingsComponent extends Component {
         <legend>Properties</legend>
         <PropertiesForm
           types={properties.types}
-          value={this.state.settings.form.properties}
+          value={form.properties}
           onChange={value => this.bindForm('properties', value)}
         />
       </fieldset>
     </div>;
   }
 
-  renderJsonFields() {
+  renderJsonFields(json, error) {
     return <div>
       <Input
         type='textarea'
         name='json'
         label='Plain JSON'
         spellCheck='false'
-        error={this.state.errors.json}
-        onChange={this.bindValue.bind(this)}
-        value={this.state.settings.json}
+        error={error}
+        onChange={this.bindJson.bind(this)}
+        value={json}
       />
     </div>;
   }
 
   render() {
     let fields = null;
-    if (this.state.settings.source === 'form') {
-      fields = this.renderFormFields();
-    } else if (this.state.settings.source === 'json') {
-      fields = this.renderJsonFields();
+    if (this.props.source === 'form') {
+      fields = this.renderFormFields(this.props.form);
+    } else if (this.props.source === 'json') {
+      fields = this.renderJsonFields(this.props.json, this.props.error);
     }
     return (
       <div>
@@ -108,7 +82,7 @@ class SettingsComponent extends Component {
             id='setting-source-form'
             name='source'
             label='Use form'
-            checked={this.state.settings.source === 'form'}
+            checked={this.props.source === 'form'}
             value='form'
             onChange={this.bindSource.bind(this)} />
 
@@ -116,7 +90,7 @@ class SettingsComponent extends Component {
             type='radio'
             name='source'
             label='Use plain JSON'
-            checked={this.state.settings.source === 'json'}
+            checked={this.props.source === 'json'}
             value='json'
             onChange={this.bindSource.bind(this)} />
 
@@ -126,98 +100,44 @@ class SettingsComponent extends Component {
     );
   }
 
-  validate(target) {
-    if (target.name === 'json') {
-      let settings = JSON.parse(target.value);
-      validator.validate(settings);
-    }
-  }
-
-  validateValue(e) {
-    let next = { ...this.state };
-
-    next.errors.json = '';
-    try {
-      this.validate(e.target);
-    } catch (err) {
-      next.errors.json = err.message;
-    }
-    next.settings[e.target.name] = e.target.value;
-  }
-
   bindForm(name, value) {
-    let next = { ...this.state,
-      settings: { ...this.state.settings,
-        form: { ...this.state.settings.form }}};
-    next.settings.form[name] = value;
-    this.setState(next);
-    this.context.store.dispatch(settingActions.save(next.settings));
-  }
-
-  bindValue(e) {
-    let next = { ...this.state };
-    let error = false;
-
-    next.errors.json = '';
-    try {
-      this.validate(e.target);
-    } catch (err) {
-      next.errors.json = err.message;
-      error = true;
-    }
-    next.settings[e.target.name] = e.target.value;
-
-    this.setState(this.state);
-    if (!error) {
-      this.context.store.dispatch(settingActions.save(next.settings));
-    }
-  }
-
-  migrateToForm() {
-    let b = window.confirm(DO_YOU_WANT_TO_CONTINUE);
-    if (!b) {
-      this.setState(this.state);
-      return;
-    }
-    try {
-      validator.validate(JSON.parse(this.state.settings.json));
-    } catch (err) {
-      this.setState(this.state);
-      return;
-    }
-
-    let form = settingsValues.formFromJson(
-      this.state.settings.json, KeymapsForm.AllowdOps);
-    let next = { ...this.state };
-    next.settings.form = form;
-    next.settings.source = 'form';
-    next.errors.json = '';
-
-    this.setState(next);
-    this.context.store.dispatch(settingActions.save(next.settings));
+    let settings = {
+      source: this.props.source,
+      json: this.props.json,
+      form: { ...this.props.form },
+    };
+    settings.form[name] = value;
+    this.props.dispatch(settingActions.save(settings));
   }
 
-  migrateToJson() {
-    let json = settingsValues.jsonFromForm(this.state.settings.form);
-    let next = { ...this.state };
-    next.settings.json = json;
-    next.settings.source = 'json';
-    next.errors.json = '';
-
-    this.setState(next);
-    this.context.store.dispatch(settingActions.save(next.settings));
+  bindJson(e) {
+    let settings = {
+      source: this.props.source,
+      json: e.target.value,
+      form: this.props.form,
+    };
+    this.props.dispatch(settingActions.save(settings));
   }
 
   bindSource(e) {
-    let from = this.state.settings.source;
+    let from = this.props.source;
     let to = e.target.value;
 
     if (from === 'form' && to === 'json') {
-      this.migrateToJson();
+      this.props.dispatch(settingActions.switchToJson(this.props.form));
     } else if (from === 'json' && to === 'form') {
-      this.migrateToForm();
+      let b = window.confirm(DO_YOU_WANT_TO_CONTINUE);
+      if (!b) {
+        return;
+      }
+      this.props.dispatch(settingActions.switchToForm(this.props.json));
     }
+
+    let settings = this.context.store.getState();
+    this.props.dispatch(settingActions.save(settings));
   }
 }
 
-export default SettingsComponent;
+const mapStateToProps = state => state;
+
+export default connect(mapStateToProps)(SettingsComponent);
diff --git a/src/settings/reducers/setting.js b/src/settings/reducers/setting.js
index 70c6183..8e4a415 100644
--- a/src/settings/reducers/setting.js
+++ b/src/settings/reducers/setting.js
@@ -4,20 +4,33 @@ const defaultState = {
   source: '',
   json: '',
   form: null,
-  value: {}
+  error: '',
 };
 
 export default function reducer(state = defaultState, action = {}) {
   switch (action.type) {
   case actions.SETTING_SET_SETTINGS:
-    return {
+    return { ...state,
       source: action.source,
       json: action.json,
       form: action.form,
-      value: action.value,
-    };
+      errors: '',
+      error: '', };
+  case actions.SETTING_SHOW_ERROR:
+    return { ...state,
+      error: action.text,
+      json: action.json, };
+  case actions.SETTING_SWITCH_TO_FORM:
+    return { ...state,
+      error: '',
+      source: 'form',
+      form: action.form, };
+  case actions.SETTING_SWITCH_TO_JSON:
+    return { ...state,
+      error: '',
+      source: 'json',
+      json: action.json, };
   default:
     return state;
   }
 }
-
diff --git a/test/settings/reducers/setting.test.js b/test/settings/reducers/setting.test.js
index b9579cf..d800394 100644
--- a/test/settings/reducers/setting.test.js
+++ b/test/settings/reducers/setting.test.js
@@ -1,21 +1,55 @@
 import actions from 'settings/actions';
 import settingReducer from 'settings/reducers/setting';
 
-describe("setting reducer", () => {
+describe("settings setting reducer", () => {
   it('return the initial state', () => {
     let state = settingReducer(undefined, {});
     expect(state).to.have.deep.property('json', '');
-    expect(state).to.have.deep.property('value', {});
+    expect(state).to.have.deep.property('form', null);
+    expect(state).to.have.deep.property('error', '');
   });
 
   it('return next state for SETTING_SET_SETTINGS', () => {
     let action = {
       type: actions.SETTING_SET_SETTINGS,
+      source: 'json',
       json: '{ "key": "value" }',
-      value: { key: 123 },
+      form: {},
     };
     let state = settingReducer(undefined, action);
+    expect(state).to.have.deep.property('source', 'json');
     expect(state).to.have.deep.property('json', '{ "key": "value" }');
-    expect(state).to.have.deep.property('value', { key: 123 });
+    expect(state).to.have.deep.property('form', {});
+  });
+
+  it('return next state for SETTING_SHOW_ERROR', () => {
+    let action = {
+      type: actions.SETTING_SHOW_ERROR,
+      text: 'bad value',
+      json: '{}',
+    };
+    let state = settingReducer(undefined, action);
+    expect(state).to.have.deep.property('error', 'bad value');
+    expect(state).to.have.deep.property('json', '{}');
+  });
+
+  it('return next state for SETTING_SWITCH_TO_FORM', () => {
+    let action = {
+      type: actions.SETTING_SWITCH_TO_FORM,
+      form: {},
+    };
+    let state = settingReducer(undefined, action);
+    expect(state).to.have.deep.property('form', {});
+    expect(state).to.have.deep.property('source', 'form');
+  });
+
+  it('return next state for SETTING_SWITCH_TO_JSON', () => {
+    let action = {
+      type: actions.SETTING_SWITCH_TO_JSON,
+      json: '{}',
+    };
+    let state = settingReducer(undefined, action);
+    expect(state).to.have.deep.property('json', '{}');
+    expect(state).to.have.deep.property('source', 'json');
   });
 });