{"id":20191,"date":"2026-06-14T07:40:11","date_gmt":"2026-06-14T07:40:11","guid":{"rendered":"https:\/\/offline-web.com\/?page_id=20191"},"modified":"2026-09-21T14:38:46","modified_gmt":"2026-09-21T11:38:46","slug":"vanilla-js-to-vue-migration","status":"publish","type":"page","link":"https:\/\/offline-web.com\/en\/vanilla-js-to-vue-migration\/","title":{"rendered":"Vanilla JavaScript application modernization"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"20191\" class=\"elementor elementor-20191\" data-elementor-settings=\"{&quot;ha_cmc_init_switcher&quot;:&quot;no&quot;}\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d3ac916 e-flex e-con-boxed tm-col-stretched-none tm-bg-color-over-image e-con e-parent\" data-id=\"d3ac916\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-e2e9085 e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"e2e9085\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t<div class=\"elementor-element elementor-element-d405010 e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"d405010\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a38a676 elementor-widget elementor-widget-image\" data-id=\"a38a676\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.button-over-image\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/6-vanilla-js-to-vue-1024x538.png\" class=\"attachment-large size-large wp-image-20627\" alt=\"Vanilla JS to Vue migration \u2014 tangled scripts replaced by typed Vue 3 components\" srcset=\"https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/6-vanilla-js-to-vue-1024x538.png 1024w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/6-vanilla-js-to-vue-300x158.png 300w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/6-vanilla-js-to-vue-768x403.png 768w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/6-vanilla-js-to-vue.png 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f2e6a24 e-con-full tm-col-stretched-none e-flex tm-bg-color-over-image e-con e-child\" data-id=\"f2e6a24\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t<div class=\"elementor-element elementor-element-3816ae8 e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"3816ae8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-29dddb4 elementor-widget elementor-widget-tm-ele-text-editor\" data-id=\"29dddb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"tm-text-editor\" >\r\n\t\t<p>A Vanilla JavaScript codebase does not automatically need a framework. Modernization starts by understanding where the current structure is creating friction and whether a framework would actually simplify the product.<\/p>\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d9db55d elementor-widget elementor-widget-tm-ele-text-editor\" data-id=\"d9db55d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"tm-text-editor\" >\r\n\t\t<h2>When migration makes sense<\/h2><p>As the product grows, shared state, repeated DOM logic and increasingly connected screens can make the code difficult to reason about.<\/p><h3>Do you always need a framework?<\/h3><p>No. The first decision is not which framework to use. Small, stable parts can remain as they are if replacing them adds no value.<\/p>\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-423ee12 e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"423ee12\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2ded4b6 elementor-widget__width-initial elementor-widget elementor-widget-tm-ele-iconbox\" data-id=\"2ded4b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-iconbox.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-sc-icon-box icon-box icon-left icon-left-style2 icon-text responsive-mobile icon-left-style2 animate-hover icon-rotate-y\">\r\n\t\r\n  \t<div class=\"icon-box-wrapper\">\r\n\t\t<div class=\"icon-left-block\">\r\n\t\t\t<div class=\"icon-box-icon\">\r\n\t\t\t\t\r\n\t\t<div class=\"icon-wrapper\">\r\n\t\t<div class=\"icon icon-round icon-type-icon-text icon-size-default\">\r\n\t\t\t\r\n\t\t\t\t<span class=\"icon-text\">\r\n\t\t\t\t01\t\t<\/span>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\r\n\t\t\t\t<h5 class=\"icon-box-title \">\r\n\t\t\t\t\t\t\tReview the existing application\t\t\t\t\t<\/h5>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t<div class=\"icon-text\">\r\n\t\t\t\t\t\t<div class=\"content\">The current structure is reviewed to find where it creates friction and whether a framework would actually simplify the product.<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\r\n\t\t\t\t\t<\/div>\r\n\t\t<div class=\"clearfix\"><\/div>\r\n\t<\/div>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2635e54 elementor-widget__width-initial elementor-widget elementor-widget-tm-ele-iconbox\" data-id=\"2635e54\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-iconbox.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-sc-icon-box icon-box icon-left icon-left-style2 icon-text responsive-mobile icon-left-style2 animate-hover icon-rotate-y\">\r\n\t\r\n  \t<div class=\"icon-box-wrapper\">\r\n\t\t<div class=\"icon-left-block\">\r\n\t\t\t<div class=\"icon-box-icon\">\r\n\t\t\t\t\r\n\t\t<div class=\"icon-wrapper\">\r\n\t\t<div class=\"icon icon-default icon-type-icon-text icon-size-default\">\r\n\t\t\t\r\n\t\t\t\t<span class=\"icon-text\">\r\n\t\t\t\t02\t\t<\/span>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\r\n\t\t\t\t<h5 class=\"icon-box-title \">\r\n\t\t\t\t\t\t\tDefine the new architecture\t\t\t\t\t<\/h5>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t<div class=\"icon-text\">\r\n\t\t\t\t\t\t<div class=\"content\">Code structure, state management and reuse are defined around how the product actually works today.<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\r\n\t\t\t\t\t<\/div>\r\n\t\t<div class=\"clearfix\"><\/div>\r\n\t<\/div>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e5aa289 e-con-full tm-col-stretched-none e-flex tm-bg-color-over-image e-con e-child\" data-id=\"e5aa289\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-16ca3c7 elementor-widget__width-initial elementor-widget elementor-widget-tm-ele-iconbox\" data-id=\"16ca3c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-iconbox.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-sc-icon-box icon-box icon-left icon-left-style2 icon-text responsive-mobile icon-left-style2 animate-hover icon-rotate-y\">\r\n\t\r\n  \t<div class=\"icon-box-wrapper\">\r\n\t\t<div class=\"icon-left-block\">\r\n\t\t\t<div class=\"icon-box-icon\">\r\n\t\t\t\t\r\n\t\t<div class=\"icon-wrapper\">\r\n\t\t<div class=\"icon icon-round icon-type-icon-text icon-size-default\">\r\n\t\t\t\r\n\t\t\t\t<span class=\"icon-text\">\r\n\t\t\t\t03\t\t<\/span>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\r\n\t\t\t\t<h5 class=\"icon-box-title \">\r\n\t\t\t\t\t\t\tMove functionality gradually\t\t\t\t\t<\/h5>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t<div class=\"icon-text\">\r\n\t\t\t\t\t\t<div class=\"content\">Only the parts that benefit from the new architecture are moved, in stages, while the application stays live.<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\r\n\t\t\t\t\t<\/div>\r\n\t\t<div class=\"clearfix\"><\/div>\r\n\t<\/div>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c60af69 elementor-widget__width-initial elementor-widget elementor-widget-tm-ele-iconbox\" data-id=\"c60af69\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-iconbox.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-sc-icon-box icon-box icon-left icon-left-style2 icon-text responsive-mobile icon-left-style2 animate-hover icon-rotate-y\">\r\n\t\r\n  \t<div class=\"icon-box-wrapper\">\r\n\t\t<div class=\"icon-left-block\">\r\n\t\t\t<div class=\"icon-box-icon\">\r\n\t\t\t\t\r\n\t\t<div class=\"icon-wrapper\">\r\n\t\t<div class=\"icon icon-round icon-type-icon-text icon-size-default\">\r\n\t\t\t\r\n\t\t\t\t<span class=\"icon-text\">\r\n\t\t\t\t04\t\t<\/span>\r\n\t\t\t\t<\/div>\r\n\r\n\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\r\n\t\t\t\t<h5 class=\"icon-box-title \">\r\n\t\t\t\t\t\t\tCleanup and delivery\t\t\t\t\t<\/h5>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t<div class=\"icon-text\">\r\n\t\t\t\t\t\t<div class=\"content\">Remaining legacy code is removed or documented, the result is verified and the work is handed over.<\/div>\r\n\t\t\t\r\n\t\t\t\r\n\t\r\n\t\t\t\t\t<\/div>\r\n\t\t<div class=\"clearfix\"><\/div>\r\n\t<\/div>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e8da98 elementor-widget elementor-widget-tm-ele-text-editor\" data-id=\"6e8da98\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"tm-text-editor\" >\r\n\t\t<h2>What can be improved<\/h2>\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-86cdc24 elementor-widget elementor-widget-tm-ele-list\" data-id=\"86cdc24\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<ul class=\"tm-sc-list \">\r\n\t<li class=\"\">\r\n\t\t\t\t<i aria-hidden=\"true\" class=\" flaticon-common-confirmation\"><\/i>\t\t\t\t<span>\r\n\tCode structure<\/span><\/li>\t<li class=\"\">\r\n\t\t\t\t<i aria-hidden=\"true\" class=\" flaticon-common-confirmation\"><\/i>\t\t\t\t<span>\r\n\tState management<\/span><\/li>\t<li class=\"\">\r\n\t\t\t\t<i aria-hidden=\"true\" class=\" flaticon-common-confirmation\"><\/i>\t\t\t\t<span>\r\n\tReuse<\/span><\/li>\t<li class=\"\">\r\n\t\t\t\t<i aria-hidden=\"true\" class=\" flaticon-common-confirmation\"><\/i>\t\t\t\t<span>\r\n\tDevelopment workflow<\/span><\/li><\/ul>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0944a7e e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"0944a7e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t<div class=\"elementor-element elementor-element-0ab3413 e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"0ab3413\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bd319f7 elementor-widget elementor-widget-image\" data-id=\"bd319f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-1-1024x576.png\" class=\"attachment-large size-large wp-image-20616\" alt=\"Vanilla JS to Vue migration: querySelector DOM soup replaced by one typed component\" srcset=\"https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-1-1024x576.png 1024w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-1-300x169.png 300w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-1-768x432.png 768w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-1.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4a6b67c e-con-full tm-col-stretched-none e-flex tm-bg-color-over-image e-con e-child\" data-id=\"4a6b67c\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cb4c907 elementor-widget elementor-widget-image\" data-id=\"cb4c907\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-2-1024x576.png\" class=\"attachment-large size-large wp-image-20638\" alt=\"Vanilla JS to Vue migration: application state in one typed Pinia store\" srcset=\"https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-2-1024x576.png 1024w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-2-300x169.png 300w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-2-768x432.png 768w, https:\/\/offline-web.com\/wp-content\/uploads\/2026\/08\/vanilla-js-to-vue-inner-2.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fa8cc83 ha-has-bg-overlay elementor-widget elementor-widget-tm-ele-accordion\" data-id=\"fa8cc83\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-accordion.skin-classic\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div id=\"accordion-holder-835582\" class=\"tm-accordion skin-classic\">\r\n\t\r\n  <div class=\"card active\">\r\n    <div class=\"card-header p-0\" id=\"heading481\">\r\n      <h5 class=\"title \" data-bs-toggle=\"collapse\" data-bs-target=\"#collapse481\" aria-expanded=\"true\" aria-controls=\"collapse481\">\r\n        <span class=\"text\">Is it bad for an application to use Vanilla JavaScript?<\/span>\r\n        <span class=\"accordion-controls-icon\"><svg class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\r\n      <\/h5>\r\n    <\/div>\r\n    <div id=\"collapse481\" class=\"collapse show\" aria-labelledby=\"heading481\" data-bs-parent=\"#accordion-holder-835582\">\r\n      <div class=\"card-body\">\r\n        No. For many applications it is a perfectly suitable choice. Migration only makes sense when the complexity of the project starts to create real limitations.      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"card \">\r\n    <div class=\"card-header p-0\" id=\"heading482\">\r\n      <h5 class=\"title collapsed\" data-bs-toggle=\"collapse\" data-bs-target=\"#collapse482\" aria-expanded=\"false\" aria-controls=\"collapse482\">\r\n        <span class=\"text\">Does the whole application have to be migrated at once?<\/span>\r\n        <span class=\"accordion-controls-icon\"><svg class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\r\n      <\/h5>\r\n    <\/div>\r\n    <div id=\"collapse482\" class=\"collapse \" aria-labelledby=\"heading482\" data-bs-parent=\"#accordion-holder-835582\">\r\n      <div class=\"card-body\">\r\n        Not necessarily. If the existing architecture allows it, the migration can happen gradually.      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"card \">\r\n    <div class=\"card-header p-0\" id=\"heading483\">\r\n      <h5 class=\"title collapsed\" data-bs-toggle=\"collapse\" data-bs-target=\"#collapse483\" aria-expanded=\"false\" aria-controls=\"collapse483\">\r\n        <span class=\"text\">Should Vue or React be used?<\/span>\r\n        <span class=\"accordion-controls-icon\"><svg class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\r\n      <\/h5>\r\n    <\/div>\r\n    <div id=\"collapse483\" class=\"collapse \" aria-labelledby=\"heading483\" data-bs-parent=\"#accordion-holder-835582\">\r\n      <div class=\"card-body\">\r\n        Not before the application has been reviewed. The technology is chosen based on the structure, the requirements and how the project is expected to evolve.      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"card \">\r\n    <div class=\"card-header p-0\" id=\"heading484\">\r\n      <h5 class=\"title collapsed\" data-bs-toggle=\"collapse\" data-bs-target=\"#collapse484\" aria-expanded=\"false\" aria-controls=\"collapse484\">\r\n        <span class=\"text\">Can part of the existing JavaScript stay as it is?<\/span>\r\n        <span class=\"accordion-controls-icon\"><svg class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\r\n      <\/h5>\r\n    <\/div>\r\n    <div id=\"collapse484\" class=\"collapse \" aria-labelledby=\"heading484\" data-bs-parent=\"#accordion-holder-835582\">\r\n      <div class=\"card-body\">\r\n        Yes. Code that is clean, self-contained and still doing its job properly does not necessarily need to be replaced.      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"card active\">\r\n    <div class=\"card-header p-0\" id=\"heading485\">\r\n      <h5 class=\"title \" data-bs-toggle=\"collapse\" data-bs-target=\"#collapse485\" aria-expanded=\"true\" aria-controls=\"collapse485\">\r\n        <span class=\"text\">Can tests be added during the migration?<\/span>\r\n        <span class=\"accordion-controls-icon\"><svg class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/span>\r\n      <\/h5>\r\n    <\/div>\r\n    <div id=\"collapse485\" class=\"collapse show\" aria-labelledby=\"heading485\" data-bs-parent=\"#accordion-holder-835582\">\r\n      <div class=\"card-body\">\r\n        Yes. A migration is often a good moment to add tests around the critical functionality and reduce the risk of future changes.      <\/div>\r\n    <\/div>\r\n  <\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8f42358 e-con-full tm-col-stretched-none e-flex tm-bg-color-over-image e-con e-child\" data-id=\"8f42358\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t<div class=\"elementor-element elementor-element-421ce43 e-con-full e-flex tm-col-stretched-none tm-bg-color-over-image e-con e-child\" data-id=\"421ce43\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1fa99f1 elementor-widget elementor-widget-tm-ele-text-editor\" data-id=\"1fa99f1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"tm-text-editor\" >\r\n\t\t<h4>More Services<\/h4><p><\/p>\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-28683ce elementor-widget__width-initial elementor-absolute elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"28683ce\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_position&quot;:&quot;absolute&quot;}\" data-widget_type=\"divider.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dd8feda elementor-widget elementor-widget-tm-ele-navigation-menu\" data-id=\"dd8feda\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-navigation-menu.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-sc-simple-nav-menu\"><ul id=\"menu-services-links\" class=\"\"><li id=\"menu-item-20082\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-20082\"><a href=\"https:\/\/offline-web.com\/en\/vue-migration\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>Application modernization<\/a><\/li>\n<li id=\"menu-item-20083\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-20083\"><a href=\"https:\/\/offline-web.com\/en\/web-app-development\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>Custom web application development<\/a><\/li>\n<li id=\"menu-item-20084\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-20084\"><a href=\"https:\/\/offline-web.com\/en\/excel-to-dashboard\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>Excel to Web App<\/a><\/li>\n<li id=\"menu-item-20085\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-20085\"><a href=\"https:\/\/offline-web.com\/en\/jquery-to-vue-migration\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>jQuery application modernization<\/a><\/li>\n<li id=\"menu-item-22467\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-22467\"><a href=\"https:\/\/offline-web.com\/en\/nuxt-migration\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>Nuxt 4 migration<\/a><\/li>\n<li id=\"menu-item-20897\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-20897\"><a href=\"https:\/\/offline-web.com\/en\/ai-integration\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>AI Features for Vue &#038; Nuxt<\/a><\/li>\n<li id=\"menu-item-20199\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-20199\"><a href=\"https:\/\/offline-web.com\/en\/vanilla-js-to-vue-migration\/\"><i class=\"tm-nav-arrow-icon  flaticon-common-arrow-right\"><\/i>Vanilla JavaScript application modernization<\/a><\/li>\n<\/ul><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-059332d e-con-full tm-col-stretched-none e-flex tm-bg-color-over-image e-con e-child\" data-id=\"059332d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e2aacc8 elementor-widget elementor-widget-tm-ele-text-editor\" data-id=\"e2aacc8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"tm-text-editor\" >\r\n\t\t<h4>Get in touch<\/h4>\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e8e5501 elementor-widget elementor-widget-tm-ele-text-editor-advanced\" data-id=\"e8e5501\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-text-editor-advanced.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"tm-text-editor-advanced\">\r\n\t\t\t\t\t<div class=\"each-item elementor-repeater-item-f5252c0\" >\r\n\t\t\t\t<p>Athens, Greece, working remotely with EU &amp; US teams<\/p>\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div class=\"each-item elementor-repeater-item-7af36a6\" >\r\n\t\t\t\t<p>info@offline-web.com<\/p>\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-04cc65f elementor-widget elementor-widget-tm-ele-iconbox\" data-id=\"04cc65f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-iconbox.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-sc-icon-box icon-box icon-left font-icon icon-left animate-hover icon-rotate-y\">\r\n\t\r\n  \t<div class=\"icon-box-wrapper\">\r\n\t\t\r\n\t\t<div class=\"icon-wrapper\">\r\n\t\t<div class=\"icon icon-default icon-type-font-icon icon-size-default\">\r\n\t\t\t<i aria-hidden=\"true\" class=\" flaticon-common-technology\"><\/i>\t\t<\/div>\r\n\r\n\t\t\t<\/div>\r\n\t\t\t<div class=\"icon-text\">\r\n\t\t\t\t\t\t<div class=\"content\">Complete the form with the basic information. You will receive a short questionnaire that takes about 10 minutes, followed by a first estimate of cost and timeline based on your answers.<\/div>\r\n\t\t\t\r\n\t\t\t\t<h5 class=\"icon-box-title \">\r\n\t\t\t\t\t\t\tGet a first estimate\t\t\t\t\t<\/h5>\r\n\t\t\t\t\t\r\n\t\t\t\r\n\t\r\n\t\t\t\t\t<\/div>\r\n\t\t<div class=\"clearfix\"><\/div>\r\n\t<\/div>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cc4af09 tm-contact-form-7-button-full-width elementor-widget elementor-widget-tm-ele-contact-form-7\" data-id=\"cc4af09\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"tm-ele-contact-form-7.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"tm-contact-form-7-wrapper\">\r\n\t\t\t\t<div class=\"tm-contact-form tm-contact-form-7 tm-contact-form-cc4af09 placeholder-show tm-contact-form-align-default\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f6-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"6\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/pages\/20191#wpcf7-f6-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"6\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.1.6\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f6-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/><input type=\"hidden\" name=\"_wpcf7_recaptcha_response\" value=\"\" \/>\n<\/fieldset>\n<div class=\"contact\">\n  <div class=\"row g-3\">\n    <div class=\"col-sm-6\">\n       <label for=\"fname\">Name *<\/label>\n       <span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required form-control\" autocomplete=\"name\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Jane Doe\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n    <\/div>\n    <div class=\"col-sm-6\">\n       <label for=\"femail\">Email *<\/label>\n       <span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email form-control\" autocomplete=\"email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"you@example.com\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span>\n    <\/div>\n    <div class=\"col-sm-12\">\n       <label for=\"fcompany\">Company or website (optional)<\/label>\n       <span class=\"wpcf7-form-control-wrap\" data-name=\"your-company\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text form-control\" aria-invalid=\"false\" placeholder=\"Company name or website, if you have one\" value=\"\" type=\"text\" name=\"your-company\" \/><\/span>\n       <small class=\"form-hint\">A link helps me scope your project faster.<\/small>\n    <\/div>\n    <div class=\"col-sm-12\">\n       <label for=\"fservice\">Which service? *<\/label>\n       <span class=\"wpcf7-form-control-wrap\" data-name=\"your-service\"><select class=\"wpcf7-form-control wpcf7-select wpcf7-validates-as-required form-control\" aria-required=\"true\" aria-invalid=\"false\" name=\"your-service\"><option value=\"\">&#8212;Please choose an option&#8212;<\/option><option value=\"Vue 2 to 3 migration\">Vue 2 to 3 migration<\/option><option value=\"jQuery to Vue migration\">jQuery to Vue migration<\/option><option value=\"Nuxt migration\">Nuxt migration<\/option><option value=\"Vanilla JS to Vue migration\">Vanilla JS to Vue migration<\/option><option value=\"Excel to web app \/ dashboard\">Excel to web app \/ dashboard<\/option><option value=\"Custom web app development\">Custom web app development<\/option><option value=\"AI features \/ LLM integration\">AI features \/ LLM integration<\/option><option value=\"Something else\">Something else<\/option><\/select><\/span>\n    <\/div>\n    <div class=\"col-sm-12\">\n       <label for=\"fmessage\">What do you want to build or fix? *<\/label>\n       <span class=\"wpcf7-form-control-wrap\" data-name=\"your-message\"><textarea cols=\"40\" rows=\"4\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea wpcf7-validates-as-required form-control\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"e.g. Migrate a Vue 2 dashboard to Vue 3, or turn an Excel workflow into a web app. A sentence or two is enough.\" name=\"your-message\"><\/textarea><\/span>\n    <\/div>\n    <div class=\"col-sm-12\">\n       <input class=\"wpcf7-form-control wpcf7-submit has-spinner btn btn-theme-colored2\" type=\"submit\" value=\"Get a first estimate\" \/>\n    <\/div>\n    <div class=\"col-sm-12\">\n       <p class=\"form-sla\">Complete the short questionnaire and I'll prepare a first estimate of cost and timeline.<\/p>\n       <p class=\"offline-recaptcha-note\">This site is protected by reCAPTCHA and the Google <a href=\"https:\/\/policies.google.com\/privacy\" target=\"_blank\" rel=\"noopener\">Privacy Policy<\/a> and <a href=\"https:\/\/policies.google.com\/terms\" target=\"_blank\" rel=\"noopener\">Terms of Service<\/a> apply.<\/p>\n    <\/div>\n  <\/div>\n<\/div><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n<\/div>\r\n\t\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Restructure growing Vanilla JS applications and introduce a framework only where it actually solves a problem.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-20191","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.8 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Vanilla JS application modernization &amp; migration to Vue | OFFLINE<\/title>\n<meta name=\"description\" content=\"Modernize a Vanilla JavaScript application with a clearer frontend architecture, better state management and gradual migration where it adds value.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/offline-web.com\/en\/vanilla-js-to-vue-migration\/\" \/>\n<meta property=\"og:locale\" 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