The Lottie JSON Animation Previewer allows web developers, motion designers, and mobile engineers to inspect and validate Bodymovin Lottie animation code directly in browser memory.

### How the Lottie Previewer Works Lottie files store After Effects animations as lightweight JSON trees containing layer definitions, keyframes, and vector paths: - **JSON Structure Inspection**: Paste or edit raw Lottie schema code in the editor pane, displaying root properties like version ("v"), frame rate ("fr"), in-point ("ip"), out-point ("op"), dimensions ("w", "h"), assets, and layer arrays. - **Visual Playback Preview**: Renders a live 60 FPS animation preview adjacent to the code editor. - **Code Validation**: Modifying the JSON immediately validates string formatting in client state without requiring local development servers.

### Real Code Inspection Example Using the default animated loading spinner template: - **Dimensions**: $500 \times 500\text{ px}$ canvas - **Frame Rate**: $60\text{ FPS}$ with $180$ total frames ($3\text{ seconds}$) - **Root Metadata**: Displays name "Loading Spinner" and clean layer arrays. - **Preview State**: Renders a smoothly spinning rose circular loader indicating active playback.

### Client-Side JSON Processing All JSON text editing and animation playback occur locally inside your client web browser. No proprietary motion graphics, app assets, or vector animations are transmitted to any server.