| name | lottie-animations |
| description | After Effects animation rendering for web and React applications. Use this skill when implementing Lottie animations, JSON vector animations, interactive animated icons, micro-interactions, or loading animations. Triggers on tasks involving Lottie, lottie-web, lottie-react, dotLottie, After Effects JSON export, bodymovin, animated SVG alternatives, or designer-created animations. Complements GSAP ScrollTrigger and Framer Motion for scroll-driven and interactive animations. |
Lottie Animations
Overview
Lottie is a library for rendering After Effects animations in real-time on web, iOS, Android, and React Native. Created by Airbnb, it allows designers to ship animations as easily as shipping static assets. Animations are exported from After Effects as JSON files using the Bodymovin plugin, then rendered natively with minimal performance overhead.
When to use Lottie:
- Designer-created animations that need pixel-perfect fidelity
- Complex animated icons and micro-interactions
- Loading animations and progress indicators
- Onboarding sequences and tutorial animations
- Marketing animations and promotional content
- Alternative to GIF/video with smaller file sizes and scalability
Key advantages:
- Vector-based (scalable without quality loss)
- Significantly smaller file sizes than GIF or video
- Editable at runtime (colors, speed, segments)
- Full designer control via After Effects
- Cross-platform rendering consistency
- Interactive controls (play, pause, seek, loop)
Core Concepts
Lottie Format Types
1. JSON Lottie (.json)
- Original Lottie format
- Exported from After Effects via Bodymovin plugin
- Human-readable JSON structure
- Larger file sizes (not compressed)
- Widely supported across all platforms
2. dotLottie (.lottie)
- Modern compressed format
- ZIP archive containing JSON + assets
- Supports multiple animations and themes in one file
- Smaller file sizes (up to 90% reduction)
- Recommended for production use
Library Options
lottie-web (original library):
import lottie from 'lottie-web';
lottie.loadAnimation({
container: document.getElementById('lottie-container'),
renderer: 'svg',
loop: true,
autoplay: true,
path: 'animation.json'
});
@lottiefiles/dotlottie-web (modern, recommended):
import { DotLottie } from '@lottiefiles/dotlottie-web';
new DotLottie({
canvas: document.getElementById('canvas'),
src: 'animation.lottie',
autoplay: true,
loop: true
});
@lottiefiles/dotlottie-react (React integration):
import { DotLottieReact } from '@lottiefiles/dotlottie-react';
<DotLottieReact
src="animation.lottie"
loop
autoplay
style={{ height: 300 }}
/>
lottie-react (alternative React wrapper):
import Lottie from 'lottie-react';
import animationData from './animation.json';
<Lottie animationData={animationData} loop={true} />
Animation Data Sources
1. LottieFiles (lottie.host)
- 100,000+ free animations
- Direct URL embedding
- CDN hosting
2. Local JSON/dotLottie files
- Bundled with application
- Better performance (no network request)
- Version control friendly
3. After Effects export
- Custom designer animations
- Bodymovin plugin required
- Export settings critical for file size
Common Patterns
1. Basic HTML Integration with dotLottie-web
<!DOCTYPE html>
<html>
<head>
<style>
#canvas {
width: 400px;
height: 400px;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script type="module">
import { DotLottie } from 'https://cdn.jsdelivr.net/npm/@lottiefiles/dotlottie-web/+esm';
new DotLottie({
canvas: document.getElementById('canvas'),
src: 'https://lottie.host/4db68bbd-31f6-4cd8-84eb-189de081159a/IGmMCqhzpt.lottie',
autoplay: true,
loop: true
});
</script>
</body>
</html>
2. React Component with Controls
import React from 'react';
import { DotLottieReact } from '@lottiefiles/dotlottie-react';
const AnimatedButton = () => {
const [dotLottie, setDotLottie] = React.useState(null);
const handlePlay = () => dotLottie?.play();
const handlePause = () => dotLottie?.pause();
const handleStop = () => dotLottie?.stop();
const handleSeek = (frame) => dotLottie?.setFrame(frame);
return (
<div>
<DotLottieReact
src="button-animation.lottie"
loop
autoplay={false}
dotLottieRefCallback={setDotLottie}
style={{ height: 200 }}
/>
<div>
<button onClick={handlePlay}>Play</button>
<button onClick={handlePause}>Pause</button>
<button onClick={handleStop}>Stop</button>
<button onClick={() => handleSeek(30)}>Seek to frame 30</button>
</div>
</div>
);
};
3. Event Listeners and Lifecycle Hooks
import React, { useEffect } from 'react';
import { DotLottieReact } from '@lottiefiles/dotlottie-react';
const EventDrivenAnimation = () => {
const [dotLottie, setDotLottie] = React.useState(null);
useEffect(() => {
if (!dotLottie) return;
const onLoad = () => console.log('Animation loaded');
const onPlay = () => console.log('Animation started');
const onPause = () => console.log('Animation paused');
const onComplete = () => console.log('Animation completed');
const onFrame = ({ currentFrame }) => console.log('Frame:', currentFrame);
dotLottie.addEventListener('load', onLoad);
dotLottie.addEventListener('play', onPlay);
dotLottie.addEventListener('pause', onPause);
dotLottie.addEventListener('complete', onComplete);
dotLottie.addEventListener('frame', onFrame);
return () => {
dotLottie.removeEventListener('load', onLoad);
dotLottie.removeEventListener('play', onPlay);
dotLottie.removeEventListener('pause', onPause);
dotLottie.removeEventListener('complete', onComplete);
dotLottie.removeEventListener('frame', onFrame);
};
}, [dotLottie]);
return (
<DotLottieReact
src="animation.lottie"
loop
autoplay
dotLottieRefCallback={setDotLottie}
/>
);
};
4. Scroll-Driven Animation with lottie-react
import Lottie from 'lottie-react';
import robotAnimation from './robot.json';
const ScrollAnimation = () => {
const interactivity = {
mode: 'scroll',
actions: [
{
visibility: [0, 0.2],
type: 'stop',
frames: [0]
},
{
visibility: [0.2, 0.45],
type: 'seek',
frames: [0, 45]
},
{
visibility: [0.45, 1.0],
type: 'loop',
frames: [45, 60]
}
]
};
return (
<Lottie
animationData={robotAnimation}
style={{ height: 300 }}
interactivity={interactivity}
/>
);
};
5. Hover-Triggered Segment Playback
import { useLottie, useLottieInteractivity } from 'lottie-react';
import likeButton from './like-button.json';
const HoverAnimation = () => {
const lottieObj = useLottie({
animationData: likeButton
});
const Animation = useLottieInteractivity({
lottieObj,
mode: 'cursor',
actions: [
{
position: { x: [0, 1], y: [0, 1] },
type: 'loop',
frames: [45, 60]
},
{
position: { x: -1, y: -1 },
type: 'stop',
frames: [45]
}
]
});
return <div style={{ height: 300, border: '2px solid black' }}>{Animation}</div>;
};
6. Multi-Animation and Theme Support
import { DotLottieReact } from '@lottiefiles/dotlottie-react';
import React, { useState, useEffect } from 'react';
const ThemedAnimation = () => {
const [dotLottie, setDotLottie] = useState(null);
const [animations, setAnimations] = useState([]);
const [themes, setThemes] = useState([]);
const [currentAnimationId, setCurrentAnimationId] = useState('');
const [currentThemeId, setCurrentThemeId] = useState('');
useEffect(() => {
if (!dotLottie) return;
const onLoad = () => {
setAnimations(dotLottie.manifest.animations || []);
setThemes(dotLottie.manifest.themes || []);
setCurrentAnimationId(dotLottie.activeAnimationId);
setCurrentThemeId(dotLottie.activeThemeId);
};
dotLottie.addEventListener('load', onLoad);
return () => dotLottie.removeEventListener('load', onLoad);
}, [dotLottie]);
return (
<div>
<DotLottieReact
src="multi-animation.lottie"
dotLottieRefCallback={setDotLottie}
animationId={currentAnimationId}
themeId={currentThemeId}
/>
{themes.length > 0 && (
<select value={currentThemeId} onChange={(e) => setCurrentThemeId(e.target.value)}>
{themes.map((theme) => (
<option key={theme.id} value={theme.id}>{theme.id}</option>
))}
</select>
)}
{animations.length > 0 && (
<select value={currentAnimationId} onChange={(e) => setCurrentAnimationId(e.target.value)}>
{animations.map((anim) => (
<option key={anim.id} value={anim.id}>{anim.id}</option>
))}
</select>
)}
</div>
);
};
7. Web Worker for Performance (DotLottieWorker)
import { DotLottieWorker } from '@lottiefiles/dotlottie-web';
new DotLottieWorker({
canvas: document.getElementById('canvas'),
src: 'heavy-animation.lottie',
autoplay: true,
loop: true,
workerId: 'worker-1'
});
new DotLottieWorker({
canvas: document.getElementById('canvas-2'),
src: 'animation-2.lottie',
autoplay: true,
loop: true,
workerId: 'worker-2'
});
Integration Patterns
With GSAP ScrollTrigger
import Lottie from 'lottie-react';
import gsap from 'gsap';
import ScrollTrigger from 'gsap/ScrollTrigger';
import animationData from './animation.json';
gsap.registerPlugin(ScrollTrigger);
const GSAPLottieIntegration = () => {
const lottieRef = React.useRef();
React.useEffect(() => {
const anim = lottieRef.current;
if (!anim) return;
gsap.to(anim, {
scrollTrigger: {
trigger: '#animation-section',
start: 'top center',
end: 'bottom center',
scrub: 1,
onUpdate: (self) => {
const frame = Math.floor(self.progress * (anim.totalFrames - 1));
anim.goToAndStop(frame, true);
}
}
});
}, []);
return (
<div id="animation-section" style={{ height: '200vh' }}>
<Lottie
lottieRef={lottieRef}
animationData={animationData}
autoplay={false}
loop={false}
/>
</div>
);
};
With Framer Motion
import { motion } from 'framer-motion';
import { DotLottieReact } from '@lottiefiles/dotlottie-react';
const MotionLottie = () => {
return (
<motion.div
initial={{ opacity: 0, scale: 0.8 }}
animate={{ opacity: 1, scale: 1 }}
transition={{ duration: 0.6 }}
>
<DotLottieReact
src="animation.lottie"
loop
autoplay
style={{ height: 400 }}
/>
</motion.div>
);
};
Vue 3 Integration
<script setup>
import { DotLottieVue } from '@lottiefiles/dotlottie-vue';
</script>
<template>
<DotLottieVue
style="height: 500px; width: 500px"
autoplay
loop
src="https://path-to-animation.lottie"
/>
</template>
Svelte Integration
<script lang="ts">
import { DotLottieSvelte } from '@lottiefiles/dotlottie-svelte';
import type { DotLottie } from '@lottiefiles/dotlottie-svelte';
let dotLottie: DotLottie | null = null;
function play() {
dotLottie?.play();
}
</script>
<DotLottieSvelte
src="animation.lottie"
loop={true}
autoplay={true}
dotLottieRefCallback={(ref) => dotLottie = ref}
/>
<button on:click={play}>Play</button>
Performance Optimization
File Size Optimization
1. Export Settings in After Effects:
- Enable "Skip images that aren't used"
- Use "Glyphs" instead of fonts when possible
- Simplify paths (reduce points in illustrator)
- Avoid effects that create large data (particles, noise)
- Use shape layers instead of vector layers
2. Compression:
- Use dotLottie format (.lottie) for automatic compression
- Run JSON through Lottie optimizer tools
- Remove unnecessary metadata
3. Lazy Loading:
const LazyLottie = () => {
const [shouldLoad, setShouldLoad] = React.useState(false);
React.useEffect(() => {
const observer = new IntersectionObserver((entries) => {
if (entries[0].isIntersecting) {
setShouldLoad(true);
}
});
observer.observe(document.getElementById('lottie-trigger'));
return () => observer.disconnect();
}, []);
return (
<div id="lottie-trigger">
{shouldLoad && <DotLottieReact src="animation.lottie" loop autoplay />}
</div>
);
};
Runtime Performance
1. Renderer Selection:
new DotLottie({
canvas: document.getElementById('canvas'),
src: 'animation.lottie',
autoplay: true,
loop: true,
renderConfig: {
devicePixelRatio: window.devicePixelRatio || 1
}
});
2. Web Workers:
import { DotLottieWorker } from '@lottiefiles/dotlottie-web';
new DotLottieWorker({
canvas: document.getElementById('canvas'),
src: 'heavy-animation.lottie',
autoplay: true,
loop: true
});
3. Mobile Optimization:
const isMobile = /iPhone|iPad|iPod|Android/i.test(navigator.userAgent);
new DotLottie({
canvas: document.getElementById('canvas'),
src: isMobile ? 'animation-low.lottie' : 'animation-high.lottie',
autoplay: true,
loop: true,
renderConfig: {
devicePixelRatio: isMobile ? 1 : window.devicePixelRatio
}
});
Common Pitfalls
1. Memory Leaks from Improper Cleanup
Problem: Not destroying Lottie instances when components unmount.
Solution:
const SafeAnimation = () => {
const [dotLottie, setDotLottie] = React.useState(null);
React.useEffect(() => {
return () => {
dotLottie?.destroy();
};
}, [dotLottie]);
return <DotLottieReact src="animation.lottie" dotLottieRefCallback={setDotLottie} />;
};
2. Event Listener Cleanup
Problem: Event listeners not removed, causing multiple handlers.
Solution:
useEffect(() => {
if (!dotLottie) return;
const handleComplete = () => console.log('Complete');
dotLottie.addEventListener('complete', handleComplete);
return () => {
dotLottie.removeEventListener('complete', handleComplete);
};
}, [dotLottie]);
3. Large File Sizes
Problem: Exported JSON files are 500KB+ for simple animations.
Solutions:
- Simplify After Effects composition (reduce layers, keyframes)
- Use dotLottie format for compression
- Check Bodymovin export settings (disable "Include expressions" if not needed)
- Remove unused assets before export
- Use Lottie optimizer tools: https://lottiefiles.com/tools/lottie-editor
4. Animation Performance Issues
Problem: Animation stutters or drops frames.
Solutions:
- Switch from SVG to Canvas renderer
- Use
DotLottieWorker for web worker rendering
- Reduce complexity in After Effects (fewer layers, simpler shapes)
- Lower devicePixelRatio on mobile
- Avoid animating too many properties simultaneously
5. Incorrect Path/URL References
Problem: Animation doesn't load due to CORS or incorrect paths.
Solution:
import animationData from './animation.json';
<Lottie animationData={animationData} />
<DotLottieReact src="https://example.com/animation.lottie" />
<DotLottieReact src="/animations/animation.lottie" />
6. After Effects Export Compatibility
Problem: Some After Effects features don't export to Lottie.
Unsupported features:
- Layer effects (drop shadows, glows) - use shape layers instead
- Blending modes (limited support)
- 3D layers
- Expressions (partial support)
- Track mattes (partial support)
Solution:
Resources
This skill includes:
scripts/
generate_lottie_component.py - Generate React/Vue/Svelte Lottie component boilerplateoptimize_lottie.py - Optimize Lottie JSON file size
references/
api_reference.md - Complete API documentation for lottie-web, lottie-react, and dotlottie-webafter_effects_export.md - Guide for exporting animations from After Effectsperformance_guide.md - Detailed performance optimization strategies
assets/
starter_lottie/ - Complete React + Vite starter template with Lottie examplesexamples/ - Real-world Lottie animation patterns and use cases
Related Skills
- gsap-scrolltrigger - For scroll-driven Lottie animations synchronized with page scroll
- motion-framer - Combine with Framer Motion for layout animations wrapping Lottie
- animated-component-libraries - Pre-built components that may include Lottie animations
- threejs-webgl - For 3D animations beyond Lottie's 2D capabilities
- react-three-fiber - Alternative for complex 3D animated scenes
