The State of Vue.js Report 2025 is now available! Case studies, key trends and community insights.
Vue.js Migration Guide
Are you struggling with migration your project to Vue 3.0? Together with the Vue Core Team and our Vue experts, we’ve compiled a step-by-step Migration Guide to help you modernize without the overwhelm.
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Migration to Vue 3: Still a pain point
Vue 2 officially reached End of Life (EOL) on December 31st, 2023 meaning it no longer receives new features, updates, or fixes. Yet, insights from the State of Vue.js Report 2025 reveal that many teams have not fully migrated and are still struggling to make the switch.
35%
have still used Vue 2.7x version in their projects in the last 12 months.
25%
reported experiencing challenges when migrating from Vue 2 to Vue 3.
Stuck with Vue 2?
There are many reasons why it's hard to migrate some applications to Vue 3:
Huge codebase
Lack of time/budget
Lack of experience
Dependencies without Vue 3 support or a lot of breaking changes
Usage of non-public APIs that has been changed in newer versions
Our guide will help you overcome these challenges and find a tailored solution.
Why upgrade? Key features of Vue 3
Vue 3 has new features that are not present in Vue 2, such as Teleport, Suspense, and multiple root elements per template. These functionalities open up new possibilities for developers and can help take care of an easier to maintain and develop architecture especially for complex applications.
Thanks to Vue 2.7 it is still possible to use some new libraries developed mostly for Vue 3 in Vue 2 applications. Unfortunately, only a fraction of them. New libraries created that can significantly help in the development of your application, will most likely be written exclusively for Vue 3. Vue 3’s ecosystem is already strong and we believe it will develop drastically in the near future.
End-of-life (EOL) software doesn’t receive security fixes. While Vue 2 has had no significant vulnerabilities, a supported version might be required to meet regulations or company policies. For apps with SLAs, avoid using EOL software. Though rare, browser updates could theoretically break legacy libraries.
In almost all cases, Vue 3 is faster than its previous version (about 55% faster). With an overhauled rendering engine and enhanced optimization techniques, Vue 3 ensures faster rendering speeds and better runtime performance. These improvements are particularly impactful for applications with complex UIs or large-scale user interactions, enabling smoother user experiences with less overhead.
Vue 3 introduces the Composition API, a powerful new approach to writing and organizing component logic. Unlike the Options API in Vue 2, the Composition API allows developers to group related logic, making codebases easier to read, maintain, and scale. This feature is especially valuable for teams working on large applications or developers who want to share reusable logic across multiple components.
As TypeScript adoption continues to grow in modern web development, Vue 3’s improved TypeScript integration is a game-changer. The framework was rewritten in TypeScript, leading to better type inference, cleaner typings, and a more seamless developer experience for those building type-safe applications. For businesses looking to move Vue2 to Vue3, the improved TypeScript support simplifies workflows and improves developer productivity.
Vue 3's modular architecture enables smaller bundle sizes, which is a direct win for performance optimization, especially in environments where load times are critical. Additionally, Vue 3 introduces a revamped reactivity system based on proxies, offering a more intuitive and efficient way to handle reactive states. This leads to fewer pitfalls, better debugging, and a smoother development experience.
Expert's insight
Monterail’s Incremental Approach to Migration
Vue 3 migration is more than just a technical update—it’s a strategic upgrade that needs a strategic approach.
At Monterail, we’ve found that an incremental approach works best. Rather than rewriting your entire codebase at once, we update small, self-contained parts of the application step by step. This minimizes disruption, reduces risk, and keeps your team productive.
Your legacy codebase will still be modernized—but in phases aligned with your product vision. This spreads out the effort, lowers immediate costs, and helps manage technical debt more effectively.
Expert's opinion
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Before installing Vue 3
Consider these steps even if you don’t plan to migrate.
1. Update Vue to version 2.7
New options to write and organize your code:
stable Composition API
<script setup>
CSS v-bind
New libraries, e.g. VueUse
Better tooling support: Volar
2. Start using Vite and Vitest
It's a whole new level of developer experience.
How to approach incremental migration? Potential solutions
Use migration build
@vue/compat can postpone the migration of parts of the application. Despite the small performance and size overhead, you can ship partially upgraded applications to production.
Use vue demi to share code between Vue 2 and Vue 3 apps
Vue Demi is a developer tool that allows you to write code using the universal Vue API, which can run in both Vue 2 and Vue 3 applications.
Consider implementing a microfrontend architecture
Such a solution may add complexity to the application. However, its advantage is the freedom in the approach to migration each module can now be upgraded separately.
Create new pages/modules within the new Vue 3 application and gradually move the old ones
Just introducing a new module in your application? Create it as a new application with Vue 3. You will encounter difficulties here (particularly related to code sharing), but addressing issues now can pay off sooner than you think. You may find it beneficial to slowly move previous parts of application here as you go.
Overcome Vue 3 migration challenges with proven solutions.
Below you will find three most common types of blockers when migrating to Vue 3, listed with ready-to-implement solutions.
Vue 3 Migration Guide
Choose Solutions: 1, 2, 5, 6
Solution 1. Replace libraries with the alternative one that supports both Vue 2 and Vue 3.
Some libraries that support Vue 3 also have Vue 2.7 support. Thanks to the Composition API, some libraries that provided renderless components or Vue plugins requiring installation can now be replaced with composables. VueUse, for example, provides a wide range of such utilities.
Tip: Streamlined migration you can wrap a composable yourself in a renderless component providing a similar API as the library you used before (see below).
Solution 2. Create an adapter (wrapper) around dependency.
Wrapping a library within an adapter can decouple your application and the library. If the API provided by the adapter is as small as possible and independent of the library implementation, it’s easier to update/change the library later. Plus, you can minimize the risks of upgrading, due to a better understanding of a dependency.
Solution 5. Replace the library with custom solution.
External dependencies can accomplish simple-to-implement functionalities. Review the libraries that block your Vue 3 migration. You might utilize only a fraction of it or you can replace it with your own code.
Solution 6. Wait for support for Vue 3 or contribute.
The application may be dependent on the libraries used and you can’t change it. The simplest solution: wait for stable support for Vue 3. It is worth considering whether you can support the maintainers in any way.
Choose Solutions: 1, 2, 5, 6
Solution 1. Replace libraries with the alternative one that supports both Vue 2 and Vue 3.
Some libraries that support Vue 3 also have Vue 2.7 support. Thanks to the Composition API, some libraries that provided renderless components or Vue plugins requiring installation can now be replaced with composables. VueUse, for example, provides a wide range of such utilities.
Tip: Streamlined migration you can wrap a composable yourself in a renderless component providing a similar API as the library you used before (see below).
Solution 2. Create an adapter (wrapper) around dependency.
Wrapping a library within an adapter can decouple your application and the library. If the API provided by the adapter is as small as possible and independent of the library implementation, it’s easier to update/change the library later. Plus, you can minimize the risks of upgrading, due to a better understanding of a dependency.
Solution 5. Replace the library with custom solution.
External dependencies can accomplish simple-to-implement functionalities. Review the libraries that block your Vue 3 migration. You might utilize only a fraction of it or you can replace it with your own code.
Solution 6. Wait for support for Vue 3 or contribute.
The application may be dependent on the libraries used and you can’t change it. The simplest solution: wait for stable support for Vue 3. It is worth considering whether you can support the maintainers in any way.
Choose Solutions: 2, 5
Solution 2. Create an adapter (wrapper) around dependency.
Wrapping a library within an adapter can decouple your application and the library. If the API provided by the adapter is as small as possible and independent of the library implementation, it’s easier to update/change the library later. Plus, you can minimize the risks of upgrading, due to a better understanding of a dependency.
Solution 5. Replace the library with custom solution.
External dependencies can accomplish simple-to-implement functionalities. Review the libraries that block your Vue 3 migration. You might utilize only a fraction of it or you can replace it with your own code.
Choose Solutions: 2, 3, 4, 5
Solution 2. Create an adapter (wrapper) around dependency.
Wrapping a library within an adapter can decouple your application and the library. If the API provided by the adapter is as small as possible and independent of the library implementation, it’s easier to update/change the library later. Plus, you can minimize the risks of upgrading, due to a better understanding of a dependency.
Solution 3. Write automated tests for risky parts of your code.
Using a non-public library API or utilizing its undocumented behavior, document it in the form of automated tests. This secures a peaceful night’s sleep after even minor updates, simplifies locating bugs in major updates.
Solution 4. Perhaps the solution that was used was not the best possible solution.
Using a non-public library API or utilizing its undocumented behavior, document it in the form of automated tests. This secures a peaceful night’s sleep after even minor updates, simplifies locating bugs in major updates.
Solution 5. Replace the library with custom solution.
External dependencies can accomplish simple-to-implement functionalities. Review the libraries that block your Vue 3 migration. You might utilize only a fraction of it or you can replace it with your own code.
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At Monterail, we deliver our Vue.js expertise to help businesses build scalable, high-performance applications that drive results. By partnering with us, you gain access to a team of professionals with 10+ years of Vue experience and over 40 successful Vue projects.
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