A Vanilla JS to Vue migration is not justified just because the code uses getElementById, addEventListener or innerHTML. Plain JavaScript can be the right choice for a small, stable interface. Vue 3 becomes useful when behavior is hard to trace, the DOM must be synchronized by hand, or a screen has grown without clear boundaries. I start by documenting how the current UI works and deciding whether a migration would make it easier to change.
I start by deciding whether a rewrite is useful. I follow behavior through the scripts, record which data controls each element and look for places where the UI can drift away from that data. I also mark the parts that are small, stable and already understandable. If a framework adds only a build step and another dependency to simple code, I say so and leave that code alone.
When a component framework is justified, I move one screen or widget at a time. Manual DOM updates become state-driven rendering, repeated interface behavior gets a component boundary, and undocumented assumptions become tests before the code changes. I define where state belongs instead of moving every global into a store. Existing pages can keep their current JavaScript outside the selected area, so the scope follows the maintenance problem rather than the age of the code.
What the frontend migration delivers
- Manual DOM updates become state-driven rendering where a framework is justified
- Components own behavior that used to be scattered across several scripts
- Small scripts can stay; the difficult UI moves in stages
- Documentation, handover and post-launch support agreed in scope
Do you always replace all the vanilla JavaScript?
No. I separate difficult code from scripts that are already small and clear. A framework is introduced only where component state or reactive rendering solves a real problem.
Our vanilla JS code has no tests or documentation. Is that a problem?
It changes the first step. The audit documents current behavior and turns its important assumptions into tests. Those tests become the baseline for any widget or screen that moves.
How long does the frontend migration take?
It depends on how many screens share state, how much DOM synchronization is done by hand and which scripts can stay untouched. The audit defines the useful scope and gives you a timeline for that codebase.
We run an old PHP backend. Does that need to change too?
No. A new component can use the endpoints your PHP application already exposes. I only include backend work if the audit finds that the current interface cannot support the selected screen.
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