onMount & onCleanup in SolidJS
From the SolidJS cheat sheet · Lifecycle · verified Jul 2026
onMount & onCleanup
Run code after the component mounts or when it unmounts.
typescript
// Quick Reference
import { onMount, onCleanup } from "solid-js";
onMount(() => {
console.log("Component mounted");
});
onCleanup(() => {
console.log("Component unmounted");
});💡 onMount runs once after the component is first rendered to the DOM
⚡ onCleanup works in both components and effects — cleans up between re-runs too
📌 Since components run only once, you can set up intervals directly in the function body
🟢 onMount is equivalent to createEffect that runs only on first execution
lifecyclemountcleanup
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