LOGAN - Log Analyzer

A fast, feature-rich log file viewer built with Electron.

Features

• Virtual scrolling - Handle multi-million line log files smoothly
• Fast search - Powered by ripgrep when available
• Multiple tabs - Open and switch between multiple log files
• Bookmarks - Mark important lines with comments
• Highlights - Color-code patterns (per-file or global)
• Save to Notes - Extract code snippets for later analysis
• Minimap - Visual overview with error/warning indicators
• File splitting - Split large files into manageable parts
• Zoom - Adjust font size with Ctrl+/Ctrl-

Requirements

• Node.js 18+
• ripgrep (optional, but highly recommended for fast search)

Installing ripgrep

ripgrep provides ~10-100x faster search performance.

macOS:

brew install ripgrep

Ubuntu/Debian:

sudo apt install ripgrep

Windows:

choco install ripgrep
# or
winget install BurntSushi.ripgrep

Arch Linux:

sudo pacman -S ripgrep

If ripgrep is not installed, LOGAN falls back to a stream-based search which is still faster than traditional methods.

Installation

Download Pre-built Packages

Download the latest release from GitHub Releases.

macOS:

• Download LOGAN-x.x.x-arm64.dmg (Apple Silicon) or LOGAN-x.x.x-x64.dmg (Intel)
• Open the DMG and drag LOGAN to Applications
• On first launch, right-click and select "Open" to bypass Gatekeeper

Linux:

• AppImage: Download LOGAN-x.x.x.AppImage, make executable (chmod +x), and run
• Debian/Ubuntu: Download logan_x.x.x_amd64.deb and install with sudo dpkg -i logan_x.x.x_amd64.deb

Windows:

• Installer: Download and run LOGAN.Setup.x.x.x.exe
• Portable: Download LOGAN.x.x.x.exe and run directly (no installation needed)

Build from Source

git clone https://github.com/SolidKeyAB/logan.git
cd logan
npm install
npm run build
npm start

Development

npm run build
npm start

Keyboard Shortcuts

Shortcut	Action
Ctrl+O	Open file
Ctrl+F	Find
F3 / Ctrl+G	Next match
Shift+F3	Previous match
Ctrl+B	Toggle bookmark
Ctrl+H	Highlight selection
Ctrl+Shift+S	Save to notes
Ctrl++	Zoom in
Ctrl+-	Zoom out
Ctrl+0	Reset zoom
Ctrl+Tab	Next tab
Ctrl+Shift+Tab	Previous tab
Ctrl+W	Close tab

License

MIT