There's a category of bug I see in almost every SPA I touch: the user applies a filter, sorts a table, pages through results — and then refreshes, or pastes the link to a colleague, and all of it is gone. The bug report says "it doesn't remember my state." The root cause is almost always the same: that state lived in useState, when it should have lived in the URL.
This is a mental model, not a framework feature. It applies equally in React, Vue, Svelte, or plain JS. The URL is a state management primitive you already have — built into every browser, shared for free — and most frontend teams underuse it.
What belongs in the URL
Not all state belongs there. The key question is: would a user want to share or bookmark this?
State
