Case Study
KakaoTalk Viewer
Browser-only viewer for KakaoTalk export files with search, date navigation, and multi-platform parser support.
Project Overview
KakaoTalk Viewer is a browser-based viewer for KakaoTalk export files. It renders exported .txt and .csv chat logs in a familiar messenger-style interface, so users can inspect long conversation histories without installing a desktop app or uploading private chat data to a server.
Key Features
- Multi-platform Parsing: Supports KakaoTalk exports from Windows, macOS, Android, and iOS
- Private Browser-only Workflow: Reads and renders files locally in the browser without server upload
- Search & Date Navigation: Find messages quickly and jump by date, oldest message, or latest message
- Messenger-style Rendering: Preserves date headers, invite/leave notifications, multiline messages, and links
- Large Chat Performance: Uses virtual scrolling to keep long conversation histories responsive
- Static Deployment: Runs as a GitHub Pages app with no backend dependency
Technical Challenges & Solutions
Challenge 1: Export format differences
Built separate parsers for Windows, macOS, Android, and iOS exports, including Korean and English locale variations, 12-hour/24-hour time formats, CSV quoting, multiline messages, and system notifications.
Challenge 2: Navigating long histories
Added virtualized rendering, message search, date indexing, and calendar-based jumps so old chat rooms remain fast and practical to browse.
Challenge 3: Privacy-sensitive file handling
Kept all parsing on the client side. The selected export file is read through browser APIs and never needs to leave the user’s local browser session.
What I Learned
- Designing parser-driven frontend tools with strong test coverage
- Handling platform, locale, and timestamp differences in real-world text exports
- Building usable navigation for dense conversation logs
- Keeping privacy-sensitive utilities simple through static deployment
Impact
KakaoTalk Viewer makes exported conversation data easier to inspect, search, and revisit while keeping private chat files local to the user’s browser.