Learn Lottie - 10 Code Examples & CST Typing Practice Test
Lottie is an open-source animation library that renders Adobe After Effects animations in real-time on web, mobile, and desktop platforms. It allows designers and developers to ship high-quality animations as JSON files exported via Bodymovin.
Learn LOTTIE with Real Code Examples
Updated Nov 26, 2025
Installation Setup
Install via npm/yarn: npm install lottie-web (web) or use platform-specific SDKs
Include Lottie player in your project
Load JSON animation file exported from Bodymovin
Initialize animation using Lottie API
Control playback, speed, looping, and interactivity
Environment Setup
Web browser for lottie-web
iOS/Android simulator or device
Flutter dev environment if using lottie-flutter
Include JSON animation files
Optional code for interactivity
Config Files
animations/ - JSON files from AE
components/ - Lottie wrappers
index.html / App.vue / main.dart - containers for animations
assets/ - fonts/images used in animation
scripts/ - optional playback control logic
Cli Commands
npm install lottie-web
flutter pub add lottie
pod install for iOS Lottie SDK
gradle dependency for Android Lottie SDK
Preview animations in LottieFiles or AE plugin
Internationalization
Animations are language-independent
Text layers can be replaced dynamically via AE or runtime
JSON assets can support localized text
Works across all locales without extra setup
Dynamic updates possible for multi-language apps
Accessibility
Animations should respect prefers-reduced-motion
Use semantic UI elements with Lottie overlays
Do not convey critical information solely via animation
Alternative static visuals for screen readers
Avoid rapid flashing content for sensitive users
Ui Styling
Animations integrate into UI container
Independent of app styling except size/position
Responsive-friendly if container scales
Overlays handled via platform UI
Vector graphics remain sharp on all devices
State Management
Playback state: play, pause, stop
Looping and speed adjustments
Dynamic property overrides
User interaction triggers events
No global app state dependency
Data Management
JSON files contain all animation data
Minimal runtime memory footprint
Dynamic properties managed via JS or SDK
Multiple animations can share JSON templates
Cache animations to reduce repeated parsing
Frequently Asked Questions about Lottie
What is Lottie?
Lottie is an open-source animation library that renders Adobe After Effects animations in real-time on web, mobile, and desktop platforms. It allows designers and developers to ship high-quality animations as JSON files exported via Bodymovin.
What are the primary use cases for Lottie?
App onboarding animations. Micro-interactions (buttons, loaders, checkmarks). Marketing website animations. Animated illustrations and icons. Interactive storytelling and tutorials
What are the strengths of Lottie?
Reduces app bundle size compared to GIF/video animations. Scalable vector-based animations. Interactive animations controllable via code. Seamless designer-to-developer workflow. High-quality playback across multiple platforms
What are the limitations of Lottie?
Requires After Effects for creation. Some complex AE effects may not export properly. JSON files can become large for very complex animations. Limited real-time physics or dynamic simulations. Editing requires re-export from After Effects
How can I practice Lottie typing speed?
CodeSpeedTest offers 10+ real Lottie code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.