SolidJS — Simple & Performant Reactive UI Framework

What it is

SolidJS is a declarative JavaScript library for building user interfaces. It uses fine-grained reactivity with signals, memos, and effects instead of a virtual DOM diffing algorithm. Components compile to direct DOM operations, which means updates touch only the exact DOM nodes that changed.

SolidJS appeals to frontend developers who want React-like JSX syntax but need better runtime performance, especially for data-heavy dashboards, real-time UIs, and animation-intensive applications.

How it saves time or tokens

SolidJS compiles components at build time to efficient DOM manipulation code, removing the virtual DOM overhead. The reactive system tracks dependencies at the signal level, so only the smallest possible DOM update runs when state changes. Bundle sizes are smaller because there is no runtime diffing engine. Developers familiar with React can transfer their JSX knowledge directly.

How to use

1. Scaffold a new project with npx degit solidjs/templates/js my-app or the TypeScript template.
2. Install dependencies with npm install and start the dev server with npm run dev.
3. Write components using JSX with createSignal for reactive state and createEffect for side effects.

Example

import { createSignal } from 'solid-js';

function Counter() {
  const [count, setCount] = createSignal(0);
  return (
    <button onClick={() => setCount(count() + 1)}>
      Count: {count()}
    </button>
  );
}

export default Counter;

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Common pitfalls

• Destructuring props breaks reactivity because it reads values eagerly; use props.name or mergeProps instead.
• Calling signals without parentheses (e.g., count instead of count()) returns the getter function, not the value.
• The ecosystem is smaller than React's; some third-party component libraries may not have Solid equivalents.