What are Vue lifecycle hooks, and can you name some key ones?

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What are Vue lifecycle hooks, and can you name some key ones?

Vue lifecycle hooks are special methods which enable you to execute a piece of code at certain points in the life of a Vue component between creation and mounting, updating and unmounting. They are practical in the retrieval of data, Dom manipulation, or in the removal of resources.

The following is a breakdown of the most important stages and hooks:
1. Creation (before the component is rendered)

  • beforeCreate – Called right after the instance is initialized,but prior to the establishment of the data observation and events.
  • created – Called after the instance is created and reactive data is set up. Here you can access the data and methods, but the component is not depressed to the DOM.

2. Mounting (inserting into the DOM)

  • beforeMount – Called before the initial render, just prior to the mounting of the template.
  • mounted – Called after the component is mounted to the DOM. Superior place to carry out operations that depend on DOM, such as setting up third party libraries.

3. Updating (reactive data changes)

  • beforeUpdate – Called before the DOM is patched, after reactive data changes.

  • updated – Called after the DOM is updated with reactive data changes. Useful for working with the updated DOM.

4. Unmounting (removing from the DOM)

  • beforeUnmount – Called right before a component is unmounted.

  • unmounted – Called after the component has been removed. You can clean up timers, event listeners, or subscriptions here.

Quick Tip:

– OnMounted, onUpdated, onUnmounted etc, replace the hooks of the Options API in Vue 3 with the Composition API.

Abarna Vijayarathinam Asked question September 22, 2025
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