Vuex api

Vuex api DEFAULT

The Composition API has freed reactive data from Vue components and instances, allowing it to be passed around like any JavaScript object. This has an obvious application - global reactive state. If this can be achieved, what do you need Vuex for?

In this article, I'll show you how you can replace Vuex with features of the Composition API, and also make the case for whether this is a wise idea or not.

If you want to brush up on the concepts of Vuex, first read WTF is Vuex? A Beginner's Guide To Vue's Application Data Store. And if you aren't familiar with the Vue Composition API, you can learn about that here.

Global reactive state with Composition API

The main reason Vuex exists is to allow global reactive state in a Vue app. Without it, you could only share local component state via the component interface i.e. props/events. Passing props and events from a component four of five layers deep is a type of drudgery all too familiar to Vue users.

However, the Composition API (packaged with Vue 3) allows you to create independent reactive variables outside of a component (and, in fact, outside of a Vue app). You can, for example, create a module file exporting reactive variables and import this into any component where you want to use it.

DIY Vuex with Composition API

Let's see how we can roll our own Vuex using the Composition API. Firstly, we'll create a file to declare and export global state variables.

Let's use the method to create a state object with a value , assuming we want to use this count value throughout the app.


Vuex pattern

As the Vuex documentation says - Vuex is both a pattern and a library. To make state predictable, it's important that variables aren't directly mutated.

We can implement that easily enough in our DIY Vuex. We'll use the method which creates a read-only copy of our state. We'll also provide a method which is what users will use to change the value of count (this is akin to a Vuex mutation).


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Installing the store with provide/inject

The easiest way to use our DIY Vuex store is with the provide/inject feature. So we'll import this module in the app's root instance, then it so it's available to all child components.


Now, we can access it by using :


The states values and methods can be used now:


So should you ditch Vuex?

We've seen how we can roll our own Vuex using Composition API. In doing so, we've overcome a lot of the complaints about Vuex because we have:

  • Minimal boilerplate
  • No esoteric naming like "mutations", "commits", etc
  • No additional dependencies.

So why not ditch Vuex altogether?

Advantage of Vuex 1: debugging

Even though we've copied the global reactive state mechanism, one huge advantage of Vuex that we have not copied is it's debugging capabilities.

Firstly, all mutations are tracked with Vuex, allowing you to see in Vue Devtools what component changed the state and how.

Secondly, there's time-travel debugging. This is a feature of Vuex where you can select any previous state of the app.

Advantage of Vuex 2: plugins

Another advantage of Vuex is the plugin ecosystem. For example, the vuex-persisted state plugin allows you to persist app state in local storage, and the Vue Router plugin which syncs the current route data in store state.

All the existing plugins could indeed be replicated as Composition API utilities, but without the standardized structure of Vuex, they wouldn't be plug and play.


There's no harm in creating a simple module for global reactive state using Composition API in a small project, or if it's really important to avoid any overhead.

But the debugging capabilities of Vuex still make it an essential tool for large-scale Vue app development and I can't imagine I'd stop using it in this case.

Looking forward to what's next for Vuex in version 5.

Further reading


How to Interact With an API from a Vue.js Application

A lot of developers build applications using JavaScript and this constitutes the fact that most web applications have JavaScript as one of their main programming languages. JavaScript frameworks were built to make the development process easier and quicker for developers. Vue.js is one of many popular JavaScript frameworks. Others of which include React and Angular.

What is Vue.js

Vue.js is a progressive framework for JavaScript which is used to develop interactive user interfaces. Vue.js is called a progressive framework because it is user-friendly and can be easily merged with different frameworks or libraries.

When developing most projects using Vue.js, there’ll be a need to fetch or consume data from an API. This is used to make the front-end interact with the back-end of the application. The fetched data can then be consumed on the front-end of the application.

What is an API?

API stands for Application Programming Interface, which is a set of protocols that allow applications to share data. It’s more of a software intermediary. To use APIs in Vue.js, you’ll have to make an API request using either one of these methods: Axios or Fetch methods.

These concepts will be discussed extensively in the course of this article.


To understand and follow this article, you should have:

  • Node.js installed on your computer.
  • Vue.js installed on your computer. If you don’t already have it installed, refer to the documentation.
  • Understood the key concepts in Vue.js. You can learn them from this Vue.js guide.


  1. Using Axios to consume an API
  2. Using the Fetch API method
  3. Using APIs in Vuex
  4. Conclusion

If you don’t know how to create a Vue project, check out this documentation to walk you through the process.

Using Axios to consume APIs

Axios is a promise-based HTTP client which makes it suitable for fetching data during server-side display. It works on both browser and Node apps. Axios is a library that is built around the Fetch API.

Axios Installation

To use Axios in your project, you should install it. This can be done in two ways:

  • By using ; a standard package manager for the JavaScript runtime environment Node.js. You can now see why having Node.js installed on your computer was a prerequisite.

  • By using ; a package manager that also acts as a project manager. It is synergetic with the npm registry and has the same features. To install yarn in your project, paste the following line of code in your terminal

With npm:

With yarn:

Next, you should import Axios in your file

How to make an API request and display data using Axios

Now, we’ll make our first API request using the method. A GET method is used to fetch data from an API. We want this API request running asynchronously therefore, we use a promise-based function with the keywords async/await.

You may wonder why we used a promise-based function. This is because a promise is a stand-in for a value not necessarily known when the promise is created. Since API requests take an undeterminable amount of time, we use promises. You can learn more about Promises in the MDN docs.

We also need to test for errors using the try/catch method. is used to check for errors while is used to handle the error if one occurs.

Copy the code below to your file:

The above block of code in the property will be explained line by line.

Here a function named is created. In this function, the API will be called. The keyword is prepended on the function to show that the function will make use of promises and we’ll be using it to await to pause the execution of the function until the promise is resolved.

property defines a block of code to be tested for errors as the code is executed. In the block of code , a get request is made with the keyword using axios i.e. to get data from the URL.

is prepended to the request because the function will return a promise. The data returned from the API after the promise is resolved and will be stored in the variable .

The data we get from the request is then saved to the array which is created in the data property.

If any error occurs during the execution, the error will be caught and logged in the console.

After requesting data from the API, you will need to call it on a lifecycle hook. Here we will use the lifecycle hook, this is because we will be able to retrieve sensitive data and events that are active with the hook.

We can now display the data in the template by looping through the posts using v-for directive.

Using Fetch API method

Fetch API is a powerful and flexible method of flexible APIs. It produces a global fetch() method that provides a simple and rational way to fetch resources asynchronously over the network.

To request with the Fetch API, you just have to make the request directly with the object and follow all other steps used in the Axios call above.

Creating APIs in Vuex

Vuex is a state management library for Vue.js applications. It provides a centralized store for all elements in an application.

Installing Vuex

To make use of Vuex, you will first need to install the Vuex package on your Vue application.


Then, in your folder, access the file and write the following code

Making the API request

We will be working with the file. First, we create a object which will contain all the application-level state. It serves as the object for the store in a vuex project.

Next, we create a property. Getters are like properties for stores. It is used to determine derived states based on store states. In this tutorial, we will use it to return posts in the state.

Next, we create a property. The mutation property is where we can change the state in the Vuex store. There are very similar to events where we carry out actual state alterations.

Now we can call our API in the property. Actions are equivalent to mutations only that actions commit mutations rather than mutating the state and also actions can hold asynchronous operations. Let’s go ahead with the API call.

Now, we should import the store in and pass it to our Vue app.

Now, we can display the data in our vue file. To do that, some steps need to be taken:

  1. Using the property, we access the content of the method in the store.
  1. Call the API on a lifecycle hook and employ the method to call the action.
  1. Finally display data on your template.

Here is the whole code snippet:

For the file:

For your Vue file:


In this tutorial, we have looked at two ways to interact with APIs in a Vue.js project. Both methods of interacting with the APIs are similar in many ways and both get the job done. However, it’s advised to use Axios for more complex requests as it allows many configurations of multiple requests in one place.

We also considered consuming an API in a Vuex project i.e. a project that manages multiple states.

I hope this article is of great help πŸ™‚.

Happy Coding!

Peer Review Contributions by: Mohan Raj

About the author

Edidiong Etok

Edidiong Etok is a Frontend developer passionate about building responsive and user friendly products using cutting-edge technologies. She is also a fitness junkie.

  1. Dispensary seal beach
  2. Crafting 101 terraria
  3. Miku hatsune render


Build Statusnpm bundle sizeLanguage grade: JavaScript

A module to access JSONAPI data from an API, using a Vuex store, restructured to make life easier.

NOTE: and later supports only. For the last supported version is


Documentation, including JSDoc-generated API reference, is available at: JSONAPI-Vuex Documentation


Restructured Data


JSONAPI is an extremely useful format for clearly interacting with an API - however it is less useful for the end developer, who is generally more interested in the data contained in a record than the structure surrounding it.

In this module we 'reverse' the JSONAPI data into a form where data attributes become top-level keys, and JSONAPI-specific data is moved down under another key: .

For example, the JSONAPI record:

{ "id": "1", "type": "widget", "attributes": { "name": "sprocket", "color": "black" }, "meta": {} }

This would be accessed as

This module would restructure this record to be:

{ "name": "sprocket", "color": "black", "_jv": { "id": "1", "type": "widget", "meta": {} } }

This would now be accessed as

In cases where there are multiple records being returned in an object, the id is used as the key (though this is ignored in the code, and the 'real' id is always read from ):

{ "1": { "name": "sprocket", "color": "black" }, "2": { "name": "cog", "color": "red" } }

These are accessed as or , or if a list is needed, via .

The above structure is actually how records are maintained in the store, nested below the :

{ "widget": { "1": {...}, "2": {...} }, "doohickey": { "20": {...} } }


Relationships in JSONAPI are structured as either a key containing one or more resource identifier objects under the relationship name, (or which point to the related object in the API). For entries, these are added to the 'root' of the object, where the key is the relationship name, and the value is a javascript that calls the vuex getter for that record. This allows related data to be handled as if it was an attribute. (The object is structured using the same 'id-as-key' system for multiple entries as for records as described above).

The value returned by the getter will therefore be the value of the related object (if in the store), or an empty object (if not). Updating the store will cause the retuern value to update automatically.

{ "id": "1", "type": "widget", "attributes": { "name": "sprocket" }, "relationships": { "doohickeys": { "data": [ { "type": "doohickey", "id": "20" } ] } } }

This becomes:

{"name": "sprocket","doohickeys": {"20": Β»get('doohickey/20')// getter call}}"_jv": {"id": "1","type": "widget","relationships": {...}}}

The attributes of the related object can then be accessed as e.g.:

Getting Started

Having created a Vue project, simply add the module to your , passing it an axios-like instance:

importVuexfrom'vuex'importaxiosfrom'axios'import{jsonapiModule}from'jsonapi-vuex'constapi=axios.create({baseURL: '',headers: {'Content-Type': 'application/vnd.api+json',},})exportdefaultVuex.createStore({modules: {jv: jsonapiModule(api),},})



There are a number of features which are worth explaining in more detail. Many of these can be configured - see the Configuration section.

  • Includes - If the JSONAPI record contains an section, the data in this will be added to the store alongisde the 'main' records. (If includes are not used, then you will need to use to fetch relationships).

  • Follow relationships - specified as resources in the JSONAPI data will be added alongside the attributes in the restructured data 'root' as a getter property. Querying this key will return the record from the store, if present. Additionally, helper methods will be added to to make dealing with these easier (see Helper functions)

  • Recursive Relationships - can be recursive - e.g. . This can cause infinite recursion problems with anything walking the object (such as ). By default, recursion is detected and stopped when following relationships, with the recursive relationship replaced with a (restructured) resource identifier.

  • Preserve JSON - The original JSONAPI record(s) can optionally be preserved in if needed - for example if you need access to or other sections. To avoid duplication, the section (, etc) is removed.

  • Clean Patches - by default, data passed to the action is used as-is. If is enabled, then the patch object is compared to the record in the store (if it exists), and any attributes with identical values are removed. This means that the final will only contain new or modified attributes, which is safer and more efficient, as it avoids sending unnecessary or 'stale' data. Additionally, unwanted properties in (links, meta, relationships) can be removed.

  • Merging - By default, data returned from the API overwrites records already in the store. However, this may lead to inconsistencies if using Sparse fieldsets or otherwise obtaining only a subset of data from the API. If merging is enabled, then new data will be merged onto existing data. this does however mean that you are responsible for explicitly calling the mutation in cases where attributes ahve been removed in the API, as they will never be removed from the store, only added to.

  • Clear on update - If enabled, then each new set of records is considered to be definitive for that , and any other records of that in the store will be removed. This option is useful for cases where you expect the API response to contain the full set of records from the server, as it avoids the need for manual cache expiry. The code will first apply the new records to the store, and then for each which has had new records added, remove old ones. This is designed to be more efficient in terms of updating computed properties and UI redraws than emptying then repopulating the store. (see Configuration)

  • Endpoints - by default this module assumes that object types and API endpoints (item and collection) all share the same name. however, some APIs use plurals or other variations on the endpoint names. You can override the endpoint name via the config option or the attribute (see Endpoints)

  • JSONPath - the getter takes a second (optional) argument which is a JSONPath. This is used to filter the results being returned from the store. (see )

  • Searching - The API can be searched without any changes being propagated to the store. This is useful for AJAX-style queries. (see )

  • Action Status Tracking - The state of any in-flight action can be checked to discover if it has completed yet (successfully or with an error). (See Action Status)

Vuex Methods

The 3 categories of Vuex methods are used as follows:

  • Actions - These are used to query and modify the API, returning the results. Actions are asynchronous.

  • Getters - These are used to directly query the store without contacting the API. Getters are synchronous.

  • Mutations - These are used to change the state of the store without contacting the API. (They are usually called by Actions, but can be used directly). Mutations are synchronous.


Actions API Reference

The usual way to use this module is to use wherever possible. All actions are asynchronous, and both query the API and update the store, then return data in a normalized form. Actions can be handled using the methods of promises, or using .

'Direct' Actions

There are 4 actions (with aliases): (), (), (), and which correspond to RESTful methods.

Actions are dispatched via . As this project is used as a module, the first parameter to is of the form , e.g. . The second parameter to is passed on to the action.

Actions take 2 arguments:

The first argument is an object containing restructured data. Actions which take no argument apart from the record ( and ) can also accept a URL to fetch, relative to the value of (if set). The leading slash is optional. This means you don't need to create an 'empty' restructured data object to get or delete a record.

The second argument is an (optional) config object. This is used to configure , most commonly used for adding like headers, URL parameters etc.

Note - The way Vuex is designed, can only accept 2 parameters. If passing 2 arguments to the action (i.e adding axios config), the arguments must be passed in an array.

Note - The return value of the action differs in that it returns the results of the action, rather than querying the store for the requested item/collection. This is because the may be a partial or filtered request, returning only a subset of the item/collection. This means that if you use these results, later updates to the stores will not be reflected. If you want to query the store, then use the getter once the action has returned.

Some examples:

// To get all items in a collection, using a string path:this.$store.dispatch('jv/get','widget').then((data)=>{console.log(data)})// axios request query params (JSONAPI options, auth tokens etc)constparams={token: 'abcdef123456',}// Get a specific record from the 'widget' endpoint, passing parameters to axios:this.$store.dispatch('jv/get',['widget/1',{params: params}]).then((data)=>{console.log(data)})// Restructured representation of a recordconstnewWidget={name: 'sprocket',color: 'black',_jv: {type: 'widget',},}// Create a new widget in the API, using a restructured object, and passing parameters to axios:this.$store.dispatch('jv/post',[newWidget,{params: params}]).then((data)=>{console.log(data)})// Update a widget in the APIconstwidgetColor={color: 'red',_jv: {type: 'widget',id: '1',},}this.$store.dispatch('jv/patch',[widgetColor,{params: params}])// Fetch, then update a widget in the APIthis.$store.dispatch('jv/get',['widget/1',{params: params}]).then((widget1)=>{widget1['color']='red'this.$store.dispatch('jv/patch',[widget1,{params: params}])})// Delete a widget from the APIthis.$store.dispatch('jv/delete',['widget/1',{params: params}])


The action is the same as the action, except that it does not result in any updates to the store. This action exists for efficiency purposes - for example to do 'search-as-you-type' AJAX-style queries without continually updating the store with all the results.

constwidgetSearch=(text)=>{constparams={'filter[text_contains]': text}this.$store.dispatch('jv/search','widget',{params: params}).then((data)=>{returndata})}

'Relationship' Actions

There are also 4 'relationship' actions: , , and which modify relationships via an object's relationship URL.


Note - in many cases you may prefer to use the jsonapi server-side option to get data on relationships included in your original query. (See Relationships).

Like the RESTful actions, this takes 2 arguments - the string or object to be acted on, and an axios config object. It returns a deeply nested restructured tree - .

Note - getRelated only works on specific items, not collections.

By default this action will fetch the record specified from the API, then work out its relationships and also fetch those.

If the argument is a string, it can optionally take a 3rd argument, e.g. to cause only the named relationship to be followed.

If the argument is an object, then if the object contains a section, then only these relationships will are followed. If the relationships section contains keys (i.e relationship ) but no values (i.e. resource linkage) then these will be fetched from the API.

// Assuming the API holds the following datajsonapi={data: {type: 'widget',id: '1',},relationships: {widgets: {data: {type: 'widget',id: '2',},},doohickeys: {data: {type: 'doohickey',id: '10',},},},}// Get all of widget 1's related items (widgets and doohickeys)this.$store.dispatch('jv/getRelated','widget/1').then((data)=>{console.log(data)})// Get only the items in the 'widgets' relationshipthis.$store.dispatch('jv/getRelated','widget/1/widgets').then((data)=>{console.log(data)})// Equivalent, using object instead of string argumentconstcustomRels={_jv: {type: 'widget',id: '1',relationships: {widgets: {data: {type: 'widget',id: '2',},},},},}// Equivalent, but 'doohickeys' resource linkage will be fetched from the server// i.e. { data: { type: 'doohickey', id: '10' }}constcustomRelsNoData={_jv: {type: 'widget',id: '1',relationships: {doohickeys: undefined,},},}this.$store.dispatch('jv/getRelated',customRels).then((data)=>{console.log(data)})


The other 3 methods are all for 'writing' to the relationships of an object. they use the of an object, rather than writing to the object itself.

  • - adds relationships to an item.
  • - removes relationships from an item.
  • - replace all relationships for an item.

All methods return the updated item from the API, and also update the store (by internally calling the action).

These methods take a single argument - an object representing the item, with the section containing relationships that are to be acted on. For example:

constrels={_jv: {type: 'widget',id: '1',relationships: {widgets: {data: {type: 'widget',id: '2',},},doohickeys: {data: {type: 'doohickeys',id: '10',},},},},}// Adds 'widget/2' and 'doohickey/10' relationships to 'widgets' and 'doohickeys' on 'widget/1'this.$store.dispatch('jv/postRelated',rels).then((data)=>{console.log(data)})// Removes 'widget/2' and 'doohickey/10' relationships from 'widgets' and 'doohickeys' on 'widget/1'this.$store.dispatch('jv/deleteRelated',rels).then((data)=>{console.log(data)})// Replaces 'widgets' and 'doohickeys' relationships with just 'widget/1' and 'doohickey/10'this.$store.dispatch('jv/patchRelated',rels).then((data)=>{console.log(data)})

Error Handling

Most errors are likely to be those raised by the API in response to the request. These will take the form of an Axios Error Handling object, containing an JSONAPI Error object.

To handle errors with

09 - Vue Todo: Vuex - Fetching Lists from API -



A Helper utility to simplify the usage of REST APIs with Vuex 2. Uses the popular HTTP client axios for requests. Works with websanova/vue-auth.

What is this good for

If you want to connect a REST API with Vuex you'll find that there are a few repetitive steps. You need to request the data from the api (with an action) and set the state (via a mutation). This utility (for the sake of brevity called in the README) helps in creating the store by setting up the state, mutations and actions with a easy to follow pattern.

It is not a middleware.

It's just a helper utility to help prepraring the store object for you. If there's something you don't like just overwrite the property.


npm install vuex-rest-api

Some notes: This readme assumes that you're using at least ES2015.


  1. Import (I called it ).
  2. Create a instance.
    At least you have to set the base URL of the API you're requesting from. You can also define the default state. If you don't define a default state from a property it will default to . In the example
  3. Create the actions.
    Each action represents a Vuex action. If it will be called (property ), it requests a specific API endpoint (property ) and sets the related property named to the response's payload.
  4. Create the store object
  5. Pass it to Vuex. Continue reading here to know how to call the actions.
// store.jsimportVuexfrom"vuex"importVuefrom"vue"// Step 1importVapifrom"vuex-rest-api"Vue.use(Vuex)// Step 2constposts=newVapi({baseURL: "",state: {posts: []}})// Step 3.get({action: "getPost",property: "post",path: ({ id })=>`/posts/${id}`}).get({action: "listPosts",property: "posts",path: "/posts"}).post({action: "updatePost",property: "post",path: ({ id })=>`/posts/${id}`})// Step 4.getStore()// Step 5exportconststore=newVuex.Store(posts)

Minimal example

Yep, here:

API and further documentation

The docs are now available under


Api vuex

How to consume APIs with Vuex and Axios

An application programming interface (API) is a set of programming standards for accessing an application. This means that with an API, your backend and frontend applications can communicate with each other without the knowledge of the user.

“Consuming” an API means to receive requests and send responses via an API. In this article, you’ll learn how to consume APIs from a server using Vuex and Axios.

Introducing Axios and Vuex

Some frameworks, such as Angular 2, JQuery, and, until version 2.0, Vue.js, come with built-in HTTP APIs. In Vue.js 2.0, the developers decided that the built-in HTTP client module, Vue-resource, was no longer essential and could be replaced by third-party libraries. Now, the most recommended library is Axios.

Axios is a flexible HTTP client library that uses promises by default and runs on both the client and the server, which makes it appropriate for fetching data during server-side rendering. It’s easy to use with Vue.js.

Passing props can be difficult or almost impossible for deeply nested components. It can be tempting to use direct parent/child instance references or try to mutate and synchronize multiple copies of the state via events. Neither of these options are recommended because they may lead to unmaintainable code and bugs.

Vuex is a state management pattern and library for Vue.js applications. It serves as a centralized store for all the components in an application.

components state management actions and mutations

When to use Vuex

If you have never built a large-scale single page application (SPA), using Vuex may feel too complicated and unnecessary. But if you are building a medium- to large-scale SPA, chances are you have run into situations that make you think about how to better handle state and share state between components. If so, Vuex is the right tool for you!

Why you should use Vuex

Typically, you’ll want to use Vuex:

  • If your components need to share and update state
  • Because Vuex provides a single source of truth for data/state
  • Because there’s no need to pass events from one component and down through multiple components when you have state management
  • Because global state is reactive, which means altering state allows it to be updated in every other component using it

Understanding state management and the Vuex state management pattern

State management is the management of the state of the application or, more importantly, the data that should be presented to the user at any given time.

In an SPA like Vue.js, multiple components may, at any given time, interact with and change the data before sending it back to the server. Therefore, developers need a way to manage these changes β€” “the state” β€” which can be done with Vuex state management.

Vuex is a state management pattern that lets you extract shared state out of components, manage it in a global singleton, and allow components access to the state or trigger actions, no matter where they are in the tree.

How to set up the simplest Vuex store structure

You’ll need Vue CLI to create your Vue app. If you don’t have Vue CLI installed already, run the following in your terminal:

npm install -g @vue/cli

To see if Vue CLI is already installed on your system, execute the code below. A Vue version should appear if Vue is already installed.

vue --version 2.9.6

Now, create a Vue project by running the following code in your terminal:

/** if you want to create the vue project in the folder you are currently on, use this code**/ vue create . /**if you want to create a new folder for your vue app, you should use this code**/ vue create myApp /**if you are using Vue CLI version lesser than 3.0 use this code.**/ vue-init webpack myApp

Next, answer the questions as shown in the image below to create your Vue app:Consuming an API with Vuex and Axios

Then, install dependencies required for the project with the following codes:

/** to install vuex store for the project**/ npm install vuex /**to install axios for handling http requests**/ npm install axios

Set up a simple Vuex store structure

First, create a folder in your folder and name it . In your folder, create a file and name it .

β”œβ”€β”€ index.html └── src β”œβ”€β”€ components β”œβ”€β”€ App.vue └──store └── index.js # where we assemble modules and export the store

Next, in your file, input the following code:

// import dependency to handle HTTP request to our back end import axios from 'axios' //to handle state const state = {} //to handle state const getters = {} //to handle actions const actions = {} //to handle mutations const mutations = {} //export store module export default { state, getters, actions, mutations } /** we have just created a boiler plate for our vuex store module**/

Register your store by adding the following codes to your file:

//add this line to your main.js file import store from './store' new Vue({ //add this line to your main.js file store, render: h => h(App) }) //other lines have already been added to your main.js file by default

Vuex actions and mutations explained

In Vuex, actions commit mutations instead of mutating the state. This means that while mutations can alter or change states, actions perpetuate the change. Actions can contain arbitrary asynchronous operations, meaning operations don’t need to be executed in sequence and the code doesn’t have to wait for an operation to execute; your program can continue to run.

Actions are triggered with the method and can be dispatched in components with . You can also use the helper, which maps component methods to .

Because actions commit mutations, Vuex state needs to be changed, but it can only be changed by committing a mutation. Vuex mutations each have a string type and a handler function. The handler function is where we alter or change the state, and it will receive the state as the first argument.

Keep in mind that mutation handler functions must be synchronous, and that you can commitΒ mutations in components with , or use the helper, which maps component methods to .

To understand what mutations and actions are and how they are used, we’ll register a simple mutation that will consume API from JSONplaceholder (fake online REST API for testing and prototyping):

// import dependency to handle HTTP request to our back end import axios from 'axios' import Vuex from 'vuex' import Vue from 'vue' //load Vuex Vue.use(Vuex); //to handle state const state = { posts: [] } //to handle state const getters = {} //to handle actions const actions = { getPosts({ commit }) { axios.get('') .then(response => { commit('SET_POSTS', }) } } //to handle mutations const mutations = { SET_POSTS(state, posts) { state.posts = posts } } //export store module export default new Vuex.Store({ state, getters, actions, mutations })

Now, create a new component named and paste the following code into it:

<template> <div class="hello"> <h1>{{ msg }}</h1> <div v-for='post in posts' :key=''> <h3>Post Title: </h3> {{post.title}} <h3>Post Body: </h3> {{post.body}} </div> <h2>Essential Links</h2> </div> </template> <script> export default { name: 'myStore', data () { return { msg: 'Welcome to my Vuex Store' } }, computed: { posts() { return this.$store.state.posts } }, mounted() { this.$store.dispatch("getPosts"); } } </script>

Serve your application by executing on your terminal, then navigate to to see your Vuex application.

Vuex Store application created

Vuex getters explained

In the course of passing state among components, you may need to enumerate derived state based on store state. With Vuex, getters do not actually store a value. Instead, they retrieve and set Vuex state indirectly.

Vuex getters receive the state as their first argument and can receive other getters as the second argument. is a helper that maps store getters to local computed properties.

To understand what a getter is and how to use it, we are going to compute a derived state based on our store state by hot-coding our state:

// import dependency to handle HTTP request to our back end import Vuex from 'vuex' import Vue from 'vue' //load Vuex Vue.use(Vuex); //to handle state const state = { products: [ { id: 1, title: 'Shirt', price: '$40' }, { id: 2, title: 'Trouser', price: '$10' }, ] } //to handle state const getters = { allProducts: (state) => state.products } //to handle actions const actions = {} //to handle mutations const mutations = {} //export store module export default new Vuex.Store({ state, getters, actions, mutations })

Next, in your folder, paste the following code:

<template><divclass="hello"><h1>{{ msg }}</h1><divv-for="product in products":key=""> {{product.title}}, {{product.price}} </div></div></template><script>exportdefault { name: "myStore", data() { return { msg: "Welcome to my Vuex Store Getter example", }; }, computed: { products() { returnthis.$store.getters.allProducts; }, }, }; </script>

Serve your application by executing on your terminal, then navigate to :

Vuex store getter example

Consuming APIs with Vuex and Axios using actions, mutations, state, and getters

To understand properly how to create a Vuex store and consume APIs with Axios using Vuex actions, state, mutations, and getters, we’ll create a simple Vuex application that fetches user information from our fake JSON backend:

// import dependency to handle HTTP request to our back end import axios from 'axios' import Vuex from 'vuex' import Vue from 'vue' //load Vuex Vue.use(Vuex); //to handle state const state = { users: [] } //to handle state const getters = { allUsers: (state) => state.users } //to handle actions const actions = { getUsers({ commit }) { axios.get('') .then(response => { commit('SET_USERS', }) } } //to handle mutations const mutations = { SET_USERS(state, users) { state.users = users } } //export store module export default new Vuex.Store({ state, getters, actions, mutations })

In your folder, paste the following code:

<template><divclass="hello"><h1>{{ msg }}</h1><h1>Made By Getters</h1><divv-for='gettersuser in gettersusers':key=''> {{}} {{}} {{gettersuser.address}} </div><h1>Made By Actions</h1><divv-for='user in users':key=''> {{}} {{}} {{user.address}} </div></div></template><script>exportdefault { name: 'myStore', data () { return { msg: 'Welcome to my Vuex Store' } }, computed: { gettersusers() { returnthis.$store.getters.allUsers }, users() { returnthis.$store.state.users } }, mounted() { this.$store.dispatch("getUsers"); } } </script>

Now, serve your application by executing on your terminal and again navigate to to see your first Vuex application created.

vuex store getters and actions


Different Vuex store structures

Below is the simplest Vuex store structure, where actions, getters, state, and mutations are called and exported in the .

β”œβ”€β”€ index.html └── src β”œβ”€β”€ components β”œβ”€β”€ App.vue └──store └── index.js # where we assemble modules and export the store

As your application becomes larger, there may be need to separate our actions, mutations, getters, and state modules into their different files.

β”œβ”€β”€ index.html └── src β”œβ”€β”€ components β”œβ”€β”€ App.vue └──store β”œβ”€β”€ index.js # where we assemble modules and export the β”œβ”€β”€ actions.js # root actions β”œβ”€β”€ mutations.js # root mutation β”œβ”€β”€ getters.js # root getters └── state

Because we’re using a single state tree, all states in our application are contained inside one large object. This isn’t ideal because our application grows as our actions, mutations, and state become larger, making it possible for the store to become even larger, so much so that we may not be able to keep up with it.

A great solution is to group our store into modules. Each module can contain its own state, mutations, actions, and getters, and they can even contain nested modules.

β”œβ”€β”€ index.html β”œβ”€β”€ main.js β”œβ”€β”€ api β”‚ └── ... # abstractions for making API requests β”œβ”€β”€ components β”‚ β”œβ”€β”€ App.vue β”‚ └── ... └── store β”œβ”€β”€ index.js # where we assemble modules and export the store β”œβ”€β”€ actions.js # root actions β”œβ”€β”€ mutations.js # root mutations └── modules β”œβ”€β”€ cart.js # cart module └── products.js


In this tutorial, we’ve looked at what state management is and why you need Vuex for your Vue applications. We’ve also reviewed what the Vuex store comprises and what actions, mutations, getters, and state are in Vuex.

In addition, we created a simple Vue application to demonstrate Vuex, as well as learned different Vuex store structures so you can decide which one is best for your application.

Experience your Vue apps exactly how a user does

Debugging Vue.js applications can be difficult, especially when there are dozens, if not hundreds of mutations during a user session. If you’re interested in monitoring and tracking Vue mutations for all of your users in production, try LogRocket. LogRocket Dashboard Free Trial Banner

LogRocket is like a DVR for web apps, recording literally everything that happens in your Vue apps including network requests, JavaScript errors, performance problems, and much more. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred.

The LogRocket Vuex plugin logs Vuex mutations to the LogRocket console, giving you context around what led to an error, and what state the application was in when an issue occurred.

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#3 - Vuex Setup \u0026 demo API introduction - Vuex state management tutorial

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