{"id":6564,"date":"2019-12-09T11:09:25","date_gmt":"2019-12-09T11:09:25","guid":{"rendered":"https:\/\/9series-blog.staging9.com\/?p=6564"},"modified":"2026-03-12T08:38:15","modified_gmt":"2026-03-12T08:38:15","slug":"life-cycle-hooks-of-vuejs","status":"publish","type":"post","link":"https:\/\/www.9series.com\/blog\/life-cycle-hooks-of-vuejs\/","title":{"rendered":"Vue.js Lifecycle Explained: A Complete Guide for Developers"},"content":{"rendered":"

\"Life<\/a><\/p>\n

What Is Vue.js?<\/span><\/b>\u00a0<\/span><\/h2>\n

Vue.js is an open-source JavaScript framework used to build dynamic user interfaces and single-page applications. It is lightweight, flexible, and designed to be incrementally\u00a0adoptable. Vue can function both as a simple UI layer and as a full-featured front-end framework capable of handling complex application logic.<\/span>\u00a0<\/span><\/p>\n

To master Vue development, understanding the\u00a0component\u00a0lifecycle is essential.<\/span>\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n

Understanding the Vue.js Component Lifecycle<\/span><\/b>\u00a0<\/span><\/h2>\n

Every Vue\u00a0component\u00a0goes through a series of stages from creation to destruction. Lifecycle hooks allow developers to execute custom logic at specific phases of a component\u2019s existence.<\/span>\u00a0<\/span><\/p>\n

These hooks help you:<\/span>\u00a0<\/span><\/p>\n

    \n
  • Initialize data<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
      \n
    • Access or\u00a0modify\u00a0the DOM<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
        \n
      • Debug reactive updates<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
          \n
        • Perform cleanup operations<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          Lifecycle methods are automatically bound to the\u00a0component\u00a0instance, meaning you can directly access\u00a0component\u00a0state and methods using this.<\/span>\u00a0<\/span><\/p>\n

          \u00a0<\/span><\/p>\n

          The 4 Main Categories of Vue.js Lifecycle<\/span><\/b>\u00a0<\/span><\/h2>\n

          The Vue\u00a0component\u00a0lifecycle is divided into four major phases:<\/span>\u00a0<\/span><\/p>\n

            \n
          1. Creation<\/span>\u00a0<\/span><\/li>\n<\/ol>\n
              \n
            1. Mounting<\/span>\u00a0<\/span><\/li>\n<\/ol>\n
                \n
              1. Updating<\/span>\u00a0<\/span><\/li>\n<\/ol>\n
                  \n
                1. Destruction<\/span>\u00a0<\/span><\/li>\n<\/ol>\n

                  Let\u2019s\u00a0explore each phase in detail.<\/span>\u00a0<\/span><\/p>\n

                  \u00a0<\/span><\/p>\n

                    \n
                  1. Creation Phase (Initialization)<\/span><\/b><\/li>\n<\/ol>\n

                    The creation phase occurs before the\u00a0component\u00a0is mounted to the DOM. It is\u00a0mainly used\u00a0for initializing data, setting up reactive properties, and configuring events.<\/span>\u00a0<\/span><\/p>\n

                    beforeCreate()<\/span><\/b>\u00a0<\/span><\/h2>\n

                    This hook runs\u00a0immediately\u00a0after the Vue instance is initialized but before reactive data and events are set up.<\/span>\u00a0<\/span><\/p>\n

                    At this stage:<\/span>\u00a0<\/span><\/p>\n

                      \n
                    • Data is not reactive<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                        \n
                      • Events are not initialized<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                          \n
                        • DOM is not accessible<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                          It is rarely used unless you need to perform\u00a0very early\u00a0initialization logic.<\/span>\u00a0<\/span><\/p>\n

                          created()<\/span><\/b>\u00a0<\/span><\/h2>\n

                          This hook runs after Vue has set up data reactivity and event handling.<\/span>\u00a0<\/span><\/p>\n

                          At this stage:<\/span>\u00a0<\/span><\/p>\n

                            \n
                          • Reactive data is available<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                              \n
                            • Methods are accessible<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                \n
                              • Templates are not yet mounted<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                  \n
                                • DOM is not yet rendered<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                  The\u00a0created() hook is commonly used for:<\/span>\u00a0<\/span><\/p>\n

                                    \n
                                  • Fetching initial data<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                      \n
                                    • API calls<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                        \n
                                      • Setting up watchers<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                          \n
                                        • Initializing\u00a0component\u00a0state<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                          For server-side rendering scenarios,\u00a0created() is preferred over mounting hooks for data fetching.<\/span>\u00a0<\/span><\/p>\n

                                          \u00a0<\/span><\/p>\n

                                            \n
                                          1. Mounting Phase (DOM Insertion)<\/span><\/b><\/li>\n<\/ol>\n

                                            The mounting phase occurs when the\u00a0component\u00a0is inserted into the DOM. This phase allows access to rendered elements.<\/span>\u00a0<\/span><\/p>\n

                                            beforeMount()<\/span><\/b>\u00a0<\/span><\/h2>\n

                                            This hook runs after the template is compiled and the virtual DOM is created, but before the actual DOM is updated.<\/span>\u00a0<\/span><\/p>\n

                                            At this stage:<\/span>\u00a0<\/span><\/p>\n

                                              \n
                                            • $el\u00a0is defined<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                \n
                                              • The\u00a0component\u00a0has not yet been\u00a0rendered\u00a0to the DOM<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                mounted()<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                This is one of the\u00a0most commonly used\u00a0lifecycle hooks. It runs after the\u00a0component\u00a0has been\u00a0rendered\u00a0and inserted into the DOM.<\/span>\u00a0<\/span><\/p>\n

                                                At this stage:<\/span>\u00a0<\/span><\/p>\n

                                                  \n
                                                • Full access to DOM elements<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                    \n
                                                  • Reactive data is available<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                      \n
                                                    • Template is rendered<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                      Typical use cases include:<\/span>\u00a0<\/span><\/p>\n

                                                        \n
                                                      • Accessing DOM elements<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                          \n
                                                        • Integrating third-party libraries<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                            \n
                                                          • Manipulating UI after render<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                              \n
                                                            • Running client-side only logic<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                              Note: For server-side rendering, avoid using\u00a0mounted() for\u00a0initial\u00a0data fetching. Use\u00a0created() instead.<\/span>\u00a0<\/span><\/p>\n

                                                              \u00a0<\/span><\/p>\n

                                                                \n
                                                              1. Updating Phase (Re-rendering)<\/span><\/b><\/li>\n<\/ol>\n

                                                                The updating phase occurs whenever reactive data\u00a0changes\u00a0and the\u00a0component\u00a0re-renders. These hooks are useful for debugging and responding to state changes.<\/span>\u00a0<\/span><\/p>\n

                                                                Important note: Do not mutate\u00a0component\u00a0state inside update hooks, as it may cause infinite update loops. Use computed properties or watchers instead.<\/span>\u00a0<\/span><\/p>\n

                                                                beforeUpdate()<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                                This hook runs after reactive data changes but before the DOM is patched and re-rendered.<\/span>\u00a0<\/span><\/p>\n

                                                                At this stage:<\/span>\u00a0<\/span><\/p>\n

                                                                  \n
                                                                • You can access the new state<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                    \n
                                                                  • DOM still reflects the\u00a0previous\u00a0state<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                    It is useful for performing operations before the UI updates.<\/span>\u00a0<\/span><\/p>\n

                                                                    updated()<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                                    This hook runs after the DOM has been updated and re-rendered.<\/span>\u00a0<\/span><\/p>\n

                                                                    At this stage:<\/span>\u00a0<\/span><\/p>\n

                                                                      \n
                                                                    • DOM reflects updated data<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                        \n
                                                                      • Safe to perform DOM-dependent operations<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                        This hook is commonly used for:<\/span>\u00a0<\/span><\/p>\n

                                                                          \n
                                                                        • Debugging<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                            \n
                                                                          • Triggering UI-based actions<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                              \n
                                                                            • Running logic dependent on updated DOM<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                              \u00a0<\/span><\/p>\n

                                                                                \n
                                                                              1. Destruction Phase (Teardown)<\/span><\/b><\/li>\n<\/ol>\n

                                                                                The destruction phase occurs when a\u00a0component\u00a0is removed from the DOM. It is used for cleanup and resource deallocation.<\/span>\u00a0<\/span><\/p>\n

                                                                                beforeDestroy()<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                                                This hook runs just before the\u00a0component\u00a0is destroyed.<\/span>\u00a0<\/span><\/p>\n

                                                                                At this stage:<\/span>\u00a0<\/span><\/p>\n

                                                                                  \n
                                                                                • Component\u00a0is still functional<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                    \n
                                                                                  • Events and watchers are still active<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                                    Common use cases:<\/span>\u00a0<\/span><\/p>\n

                                                                                      \n
                                                                                    • Removing event listeners<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                        \n
                                                                                      • Clearing timers<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                          \n
                                                                                        • Canceling API calls<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                            \n
                                                                                          • Cleaning up subscriptions<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                                            destroyed()<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                                                            This hook runs after the\u00a0component\u00a0has been destroyed.<\/span>\u00a0<\/span><\/p>\n

                                                                                            At this stage:<\/span>\u00a0<\/span><\/p>\n

                                                                                              \n
                                                                                            • Event listeners are removed<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                                \n
                                                                                              • Directives are unbound<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                                  \n
                                                                                                • Child components are destroyed<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                                                  It is typically used for final cleanup or notifying external services.<\/span>\u00a0<\/span><\/p>\n

                                                                                                  \u00a0<\/span><\/p>\n

                                                                                                  Why Understanding Vue Lifecycle Matters<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                                                                  Understanding Vue\u2019s lifecycle helps developers:<\/span>\u00a0<\/span><\/p>\n

                                                                                                    \n
                                                                                                  • Optimize\u00a0performance<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                                      \n
                                                                                                    • Avoid memory leaks<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                                        \n
                                                                                                      • Debug efficiently<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                                          \n
                                                                                                        • Structure code properly<\/span>\u00a0<\/span><\/li>\n<\/ul>\n
                                                                                                            \n
                                                                                                          • Integrate third-party tools safely<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

                                                                                                            It also helps you decide exactly which hook to use for specific operations, improving maintainability and scalability.<\/span>\u00a0<\/span><\/p>\n

                                                                                                            \u00a0<\/span><\/p>\n

                                                                                                            Final Thoughts<\/span><\/b>\u00a0<\/span><\/h2>\n

                                                                                                            The Vue.js lifecycle provides a clear roadmap of how a\u00a0component\u00a0evolves from initialization to destruction. By mastering lifecycle hooks, developers can build highly optimized and reactive applications.<\/span>\u00a0<\/span><\/p>\n

                                                                                                            If you are working with modern front-end frameworks or planning scalable UI development, understanding lifecycle management is a critical skill.<\/span>\u00a0<\/span><\/p>\n

                                                                                                            For deeper learning, refer to the official documentation of Vue.js and explore advanced topics such as watchers, computed properties, and\u00a0composition\u00a0API.<\/span>\u00a0<\/span><\/p>\n

                                                                                                            At 9series, we specialize in modern JavaScript frameworks and scalable front-end architecture. If you are looking to build high-performance web applications using Vue or other advanced technologies, our development team can help you deliver exceptional digital experiences.<\/span>\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

                                                                                                            What Is Vue.js?\u00a0 Vue.js is an open-source JavaScript framework used to build dynamic user interfaces and single-page applications. It is lightweight, flexible, and designed to be incrementally\u00a0adoptable. Vue can function…<\/p>\n","protected":false},"author":1,"featured_media":6565,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"dsgo_overlay_header":false,"dsgo_overlay_header_text_color":"","dsgo_overlay_skip_top_bar":false,"_designsetgo_exclude_llms":false,"footnotes":""},"categories":[1466],"tags":[2463,2464,2465,2466,2467,2468,2469,2470,2471,2472,2473],"class_list":["post-6564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vuejs","tag-best-vuejs-developers","tag-create-mobile-app-on-vuejs","tag-expert-vuejs-developers","tag-hire-vuejs-developers","tag-life-cycle-hooks-for-vuejs","tag-top-vuejs-development-agnecy","tag-vuejs-application-development","tag-vuejs-development-company","tag-vuejs-development-services","tag-vuejs-framework-development-company","tag-vuejs-life-cycle"],"_links":{"self":[{"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/posts\/6564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/comments?post=6564"}],"version-history":[{"count":3,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/posts\/6564\/revisions"}],"predecessor-version":[{"id":6926,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/posts\/6564\/revisions\/6926"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/media\/6565"}],"wp:attachment":[{"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/media?parent=6564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/categories?post=6564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9series.com\/blog\/wp-json\/wp\/v2\/tags?post=6564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}