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A Guide to Help Avoid Errors and Ensure Smooth Vue 3 Migration


Every Vue developer knows that Vue 3 is undoubtedly superior, but most issues happen during Vue 2 to Vue 3 Migration – a complicated, exciting, and adventurous process with several pitfalls. To help ensure that you can successfully migrate your systems and projects from Vue 2 to Vue 3, we have created this guide on the common mistakes that Vue developers make during migration; and, we have also listed a few strategies that we use and you can too to avoid them!

So, instead of waiting around and trying to migrate your project numerous times, let us check out this article on Vue 3 Migration and the common mistakes that developers generally make.

Vue 3 Migration Mistakes to Look For and Avoid

Although there are numerous problems that you might encounter when performing Vue 3 Migration, we will mention the most common mistakes that you must keep an eye out for and avoid below.

1.   No Dependency Updation

An important point to remember is that developers perform Vue 3 Migration because they want to take advantage of the platform’s new and updated features and functionalities; but, these benefits and advantages might not be fully recognized and implementable if the dependencies are not updated accordingly.

To ensure that no Vue 3 migration error occurs for this reason, we advise Vue developers to ensure that all third-party dependencies present in their project are compatible with Vue 3 (maybe by checking the documentation in case added support is needed). You can also try keeping your Vue Router and Vuex updated to the relevant and appropriate versions to ensure that these are compatible with Vue 3.

2.   Not Checking the Composition API

The concept of Composition API was introduced in Vue 3 and provides developers with better and more flexible ways of creating code and dividing them into logical components to allow for better code reuse. An important point that you must note – in case you fail to understand the concept of Composition API and do not use it in your code, you might end up with code that is not properly optimized and does not realize the capabilities of Vue 3 to its fullest.

3.   Not Paying Attention to Reactivity System Changes

The reactivity system in Vue 3 has been significantly improved with the purpose of ensuring that it can perform better performance and predictability; but, a point to consider – when developers assume that the reactivity system of Vue 3 is the same as that of Vue 2, they might face behavior and debugging challenges.

We recommend you hire Vue.JS developers with a proper and thorough understanding of Vue’s new reactivity system to ensure that you are familiar with the concepts, changes, and added features that can help with your code. Once you are done going through the available resources and are clear on what to do, you must refactor your code to ensure that it is leveraging the new concepts for better implementations.

4.   Not Thinking About Deprecated Features

Vue 3 contains several deprecated features and options from Vue 2, but the point to note here is that these might not be present in the upcoming versions of Vue. If you fail to identify these deprecated features and options, you might face code issues and might notice that your code is breaking at unexpected places.

So, the best approach that you can adopt is to thoroughly go through the documentation and double-check that all features and options you use are available; in case these are not available, you must look for alternatives using the documentation and replace the existing code so that your app does not crash and remains functional.

Vue 3 Migration Strategies that You Can Use for Proper Vue 3 Migration

Since there are so many possible errors that one might face when performing Vue 3 migration, the common and frequent ones can be removed by following some common Vue 3 migration strategies that we use too:-

  1. List all updatable dependencies present in your Vue 2 code and schedule them before migrating your codebase.
  1. Ensure that all present dependencies are as per Vue 3; in case the exact ones are not present, it is best to look for alternatives that help implement the same functionalities and keep the code conceptually the same.
  1. Check whether your component library supports Vue 3 or not; if it does not, it is best to use a version that supports both Vue 2 and Vue 3 (ensure that you update your codebase to the right version).
  1. Ignore learnings that are non-crucial and would take time to migrate to ensure that a basic migration of your codebase is done and it is compatible with Vue 3.
  1. Break down all tasks like component changes to code edits into smaller versions to ensure that your code’s functionality is intact and the codebase is maintained as smoothly as possible.
  1. Establish only one main migration branch where all changes are pushed only when every team member has worked on their own sub-branches and the code has worked without much hassle.
  1. Ensure that all tasks are openable in a non-blocking format, i.e. the implementation and migration of one task and its completion does not affect the other task’s implementation.
  1. Formulate a detailed testing plan that demands added collaboration of QA, Frontend, and Product Development teams to ensure that all bugs are resolved and every team is updated!


With Vue 3 introducing several new features, a lot of developers choose to migrate their codebase from Vue 2 to Vue 3; but, it is a complicated and confusing process which is why a lot of mistakes are expected. To help you stay aware of these issues and prepare ahead, we have listed the common Vue 3 Migration mistakes and the strategies we adopt to help you do this in no time. We hope the above article was a good starting point for you and helps you perform seamless Vue 3 migration in no time; you can also get in touch with a professional company offering expert VueJS development services for a quicker Vue 3 migration.

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