Vuex With Sessionstorage | Intermediate Vuejs

Using SessionStorage with Vuex

SessionStorage allows you to persist the Vuex state only for the duration of the page session. This guide covers how to use SessionStorage with Vuex to save and retrieve the Vuex state.

Key Points:

SessionStorage is a web storage API that stores data for the duration of the page session.
Integrating SessionStorage with Vuex enables you to persist the state of your application only for the current session.
You can use plugins or manually handle the synchronization between Vuex and SessionStorage.

Manual Integration

Saving State to SessionStorage

To save the Vuex state to SessionStorage, you can use the subscribe method to listen for mutations and store the state:


// store/index.js
import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++;
    }
  }
});

// Subscribe to store mutations and save the state to SessionStorage
store.subscribe((mutation, state) => {
  sessionStorage.setItem('store', JSON.stringify(state));
});

export default store;

Loading State from SessionStorage

To load the Vuex state from SessionStorage when the application initializes, you can check for the stored state and replace the initial state:


// store/index.js
import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

const persistedState = sessionStorage.getItem('store') ? JSON.parse(sessionStorage.getItem('store')) : {};

const store = new Vuex.Store({
  state: {
    count: 0,
    ...persistedState
  },
  mutations: {
    increment(state) {
      state.count++;
    }
  }
});

// Subscribe to store mutations and save the state to SessionStorage
store.subscribe((mutation, state) => {
  sessionStorage.setItem('store', JSON.stringify(state));
});

export default store;

Using Plugins

You can use the vuex-persistedstate plugin to simplify the process of persisting Vuex state to SessionStorage:


# Install vuex-persistedstate via npm
$ npm install vuex-persistedstate

# Install vuex-persistedstate via yarn
$ yarn add vuex-persistedstate

Setting Up vuex-persistedstate

After installation, set up the vuex-persistedstate plugin in your Vuex store:


// store/index.js
import Vue from 'vue';
import Vuex from 'vuex';
import createPersistedState from 'vuex-persistedstate';

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++;
    }
  },
  plugins: [createPersistedState({
    storage: window.sessionStorage
  })]
});

export default store;

Configuration Options

The vuex-persistedstate plugin provides configuration options to control which parts of the state are persisted and how:


// store/index.js
import Vue from 'vue';
import Vuex from 'vuex';
import createPersistedState from 'vuex-persistedstate';

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    count: 0,
    user: {
      name: '',
      email: ''
    }
  },
  mutations: {
    increment(state) {
      state.count++;
    },
    setUser(state, user) {
      state.user = user;
    }
  },
  plugins: [createPersistedState({
    paths: ['user'],
    storage: window.sessionStorage
  })]
});

export default store;

Example: Persisting User State

Here is a complete example demonstrating how to persist the user state in a VueJS application using SessionStorage:


// store/index.js
import Vue from 'vue';
import Vuex from 'vuex';
import createPersistedState from 'vuex-persistedstate';

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    user: {
      name: '',
      email: ''
    }
  },
  mutations: {
    setUser(state, user) {
      state.user = user;
    }
  },
  plugins: [createPersistedState({
    paths: ['user'],
    storage: window.sessionStorage
  })]
});

export default store;

// App.vue

Best Practices

Follow these best practices when using SessionStorage with Vuex:

Store Only Necessary Data: Persist only the data that needs to survive within the session to minimize storage usage.
Encrypt Sensitive Data: If you need to store sensitive data, consider encrypting it before persisting.
Handle Storage Limitations: Be aware of storage limitations and handle errors gracefully when storage is full.
Test Persistence: Test the persistence functionality thoroughly to ensure data is saved and restored correctly within the session.
Use Plugins: Use plugins like vuex-persistedstate to simplify the process and improve code maintainability.

Summary

This guide provided an overview of using SessionStorage with Vuex in VueJS applications, including manual integration, using plugins, examples, and best practices. By understanding and utilizing these techniques, you can effectively persist the state of your VueJS application for the duration of the session.

VueJS - Vuex with SessionStorage