Vue Lifecycle Hooks Deep Dive: Everything You Need to Know

tarun.laravel311

29 June 2026

Vue Lifecycle Hooks are one of the most important concepts every Vue developer should understand.

Every Vue component follows a lifecycle, from the moment it is created until it is removed from the page.

Vue provides Vue Lifecycle Hooks that allow you to execute code at specific stages of this process.

These hooks are useful for fetching data, interacting with the DOM, initializing third-party libraries, and cleaning up resources.

Understanding Vue Lifecycle Hooks helps you build faster, cleaner, and more reliable Vue applications.

What Are Vue Lifecycle Hooks?

Lifecycle hooks are special functions that Vue automatically calls during different stages of a component’s life.

They let you perform tasks before a component is rendered, after it appears on the page, when its data changes, and before it is removed.

Instead of manually controlling these stages, Vue executes the appropriate hook for you at the right time.

Vue Component Lifecycle Hooks Explained

A Vue component moves through four major phases:

Creation
Mounting
Updating
Unmounting

Each phase contains one or more lifecycle hooks. Knowing what happens during each phase helps you decide where your code should be placed.

1. beforeCreate()

The beforeCreate() hook is the first hook that Vue executes.

At this stage, the component has started initializing, but reactive data, computed properties, and methods are not yet available.

Because of this, you cannot access component state inside this hook. It is rarely used in modern Vue applications.

export default {
  beforeCreate() {
     console.log("Component is initializing")
  }
}

export default {

beforeCreate() {

console.log("Component is initializing")

}

2. created()

The created() hook runs after Vue has initialized the component’s reactive data and methods.

Although the DOM has not been rendered yet, you can access data, computed properties, and methods.

This makes it a good place to fetch initial data or prepare application state before rendering.

export default {
   created() {
     console.log("Component created")
   } 
}

export default {

created() {

console.log("Component created")

}

3. beforeMount()

The beforeMount() hook executes just before Vue inserts the component into the DOM.

The template has already been compiled, but nothing has appeared on the screen yet.

Developers rarely need this hook because most setup tasks can be handled in either created() or mounted().

beforeMount() {
   console.log("Preparing to mount")
}

beforeMount() {

console.log("Preparing to mount")

}

4. mounted()

The mounted() hook is one of the most frequently used lifecycle hooks.

It runs after the component has been added to the DOM. Since the HTML elements now exist, you can safely interact with them.

This is the ideal place to initialize charts, focus input fields, or integrate third-party libraries.

mounted() {
    console.log("Component mounted")
}

mounted() {

console.log("Component mounted")

}

5. beforeUpdate()

Whenever reactive data changes, Vue prepares to update the DOM. Before this update happens, the beforeUpdate() hook is called.

This hook is useful if you need to inspect the current DOM or save information, such as the user’s scroll position, before Vue applies the changes.

beforeUpdate() {
   console.log("Updating component")
}

beforeUpdate() {

console.log("Updating component")

}

6. updated()

The updated() hook runs after Vue has finished updating the DOM. At this point, the page reflects the latest data.

You can use this hook to work with updated elements or notify external libraries about changes.

Avoid modifying reactive state inside this hook because it can trigger an endless update cycle.

updated() {
   console.log("Component updated")
}

updated() {

console.log("Component updated")

}

7. beforeUnmount()

The beforeUnmount() hook is called just before Vue removes the component from the page.

The component is still active, making it the perfect place to remove event listeners, stop timers, or disconnect observers.

Cleaning up resources here helps prevent memory leaks.

beforeUnmount() {
    console.log("Cleaning resources")
}

beforeUnmount() {

console.log("Cleaning resources")

}

8. unmounted()

The unmounted() hook runs after the component has been completely removed from the DOM. By this stage, all child components have also been destroyed.

This hook is useful for final cleanup tasks or logging that the component has been successfully removed.

unmounted() {
   console.log("Component removed")
}

unmounted() {

console.log("Component removed")

}

Vue Lifecycle Hooks in the Composition API

Vue 3 introduced the Composition API, which provides lifecycle hooks as imported functions instead of component options.

These hooks are used inside the setup() function and offer better code organization, especially in large applications.

import { onMounted } from "vue"

export default {
   setup() {
      onMounted(() => {
        console.log("Mounted")
      })
   } 
}

import { onMounted } from "vue"

export default {

setup() {

onMounted(() => {

console.log("Mounted")

})

}

Practical Example

Suppose you’re building a dashboard that displays user information from an API. The best place to fetch the data is inside the onMounted() hook.

This ensures the component is ready before the request is processed and the data is displayed.

import { ref, onMounted } from "vue"

export default {
  setup() {
    const users = ref([])

     onMounted(async () => {
        const response = await fetch("https://jsonplaceholder.typicode.com/users")
        users.value = await response.json()
      })

    return { users }
   }
}

import { ref, onMounted } from "vue"

export default {

setup() {

const users = ref([])

onMounted(async () => {

const response = await fetch("https://jsonplaceholder.typicode.com/users")

users.value = await response.json()

})

return { users }

}

Vue Lifecycle Hooks Best Practices

Use mounted() or onMounted() whenever you need to interact with the DOM.

Always clean up timers, subscriptions, and event listeners inside beforeUnmount() or onUnmounted().

Keep lifecycle hooks focused on a single responsibility and avoid placing complex business logic directly inside them.

If logic needs to be reused, extract it into composables.

Common Vue Lifecycle Hook Mistakes

Many beginners try to access DOM elements before the component has mounted, which results in errors.

Another common mistake is updating reactive state inside the updated() hook, which may create an infinite rendering loop.

Forgetting to remove timers or event listeners when a component is destroyed can also lead to memory leaks.

Conclusion: Mastering Vue Lifecycle Hooks

Vue lifecycle hooks make it easy to perform actions at the right stage of a component’s life.

By understanding when each hook executes, you can write cleaner code, improve application performance, and avoid common development mistakes.

Whether you’re using the Options API or the Composition API, mastering lifecycle hooks is an essential step toward becoming a confident Vue developer.

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