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', // or 'canvas', 'html'
  loop: true,
  autoplay: true,
  path: 'animation.json' // or animationData: jsonData
});

@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';

// Offload animation rendering to a web worker
new DotLottieWorker({
  canvas: document.getElementById('canvas'),
  src: 'heavy-animation.lottie',
  autoplay: true,
  loop: true,
  workerId: 'worker-1' // Group multiple animations by worker
});

// Multiple animations in separate workers
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;

    // Sync Lottie with scroll
    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:

// SVG: Best quality, slower for complex animations
// Canvas: Better performance, rasterized
// HTML: Limited support, use only for simple animations

// For complex animations, prefer canvas
new DotLottie({
  canvas: document.getElementById('canvas'),
  src: 'animation.lottie',
  autoplay: true,
  loop: true,
  renderConfig: {
    devicePixelRatio: window.devicePixelRatio || 1
  }
});

2. Web Workers:

// Offload to worker for heavy animations
import { DotLottieWorker } from '@lottiefiles/dotlottie-web';

new DotLottieWorker({
  canvas: document.getElementById('canvas'),
  src: 'heavy-animation.lottie',
  autoplay: true,
  loop: true
});

3. Mobile Optimization:

// Reduce quality on mobile
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 () => {
      // Always destroy instance on unmount
      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);

  // MUST return cleanup function
  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:

// Use animationData for local imports (best for bundled apps)
import animationData from './animation.json';
<Lottie animationData={animationData} />

// OR use path for external URLs (requires CORS headers)
<DotLottieReact src="https://example.com/animation.lottie" />

// For Next.js, place in public/ folder
<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:

Test export early and often
Use LottieFiles preview before exporting
Check Bodymovin compatibility: https://airbnb.io/lottie/#/supported-features
Convert effects to shapes when possible

Resources

This skill includes:

scripts/

generate_lottie_component.py - Generate React/Vue/Svelte Lottie component boilerplate
optimize_lottie.py - Optimize Lottie JSON file size

references/

api_reference.md - Complete API documentation for lottie-web, lottie-react, and dotlottie-web
after_effects_export.md - Guide for exporting animations from After Effects
performance_guide.md - Detailed performance optimization strategies

assets/

starter_lottie/ - Complete React + Vite starter template with Lottie examples
examples/ - 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

lottie-animations

Lottie Animations

Overview

Core Concepts

Lottie Format Types

Library Options

Animation Data Sources

Common Patterns

1. Basic HTML Integration with dotLottie-web

2. React Component with Controls

3. Event Listeners and Lifecycle Hooks

4. Scroll-Driven Animation with lottie-react

5. Hover-Triggered Segment Playback

6. Multi-Animation and Theme Support

7. Web Worker for Performance (DotLottieWorker)

Integration Patterns

With GSAP ScrollTrigger

With Framer Motion

Vue 3 Integration

Svelte Integration

Performance Optimization

File Size Optimization

Runtime Performance

Common Pitfalls

1. Memory Leaks from Improper Cleanup

2. Event Listener Cleanup

3. Large File Sizes

4. Animation Performance Issues

5. Incorrect Path/URL References

6. After Effects Export Compatibility

Resources

scripts/

references/

assets/

Related Skills