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A lightweight, cross-platform API client — a focused alternative to Postman that strips away enterprise complexity in favour of a clean, fast, and intuitive experience.
Runs entirely offline. No account required. All data stored locally.
- Construct HTTP requests with full control over headers, body, query parameters, and authentication
- Organize requests into collections with folders and drag-and-drop ordering
- Use environment variables with
{{variable}}interpolation across requests - View and edit request/response bodies in a syntax-highlighted Monaco editor
- Cancel in-flight requests and configure per-request timeouts
- Intercept HTTP/HTTPS traffic through a local MITM proxy
- Set breakpoints on requests and modify them before forwarding
- Inline breakpoint editing — modify status codes, headers, body, and query params directly in the detail view
- Block specific requests or simulate timeouts
- Split request/response display — intercepted requests appear immediately with a pending badge; response data fills in when it arrives
- View intercepted images inline with zoom and pan
- "Open in Fetch" button to replay any intercepted request in the request builder
- Define URL-pattern rules (exact, partial, wildcard, regex) to automatically modify proxied traffic
- Rewrite request URLs, add or remove headers, and edit cookies
- Override response bodies using the Monaco editor or serve a file from disk
- Organize mappings into folders with drag-and-drop ordering
- Activity log sub-tab shows which mapping rules fired for each intercepted request
- Work in multiple tabs simultaneously with per-tab state isolation
- Use keyboard shortcuts (Cmd/Ctrl+Enter to send, ? for shortcuts overlay)
- Customize the application theme (light/dark/system)
- Import and export collections and environments as JSON
- Guided onboarding tour on first launch covering Fetch and Intercept tabs
- "What's New" modal on version update with full changelog
- Splash screen startup animation
- View history of all sent requests with quick replay
- Automatic persistence of collections and settings to SQLite
- Certificate and system proxy installation wizard with one-click setup and full cleanup on uninstall
| Layer | Technology |
|---|---|
| App shell | Tauri v2 (Rust) |
| HTTP engine | reqwest (Rust) |
| Frontend | React 18 + TypeScript |
| Build tool | Vite |
| Styling | Tailwind CSS v4 |
| UI components | shadcn/ui |
| State management | Zustand + Immer |
| Local database | SQLite via tauri-plugin-sql |
| Code editor | Monaco Editor |
| Testing | Vitest + Testing Library |
The frontend lives in ./ (a Vite project). Tauri wraps it, exposing Rust commands (e.g. send_request) via the IPC bridge. All persistence is SQLite in the platform data directory.
- Node.js v18+
- Rust (stable toolchain)
- Tauri CLI prerequisites for your platform
# Install Rust
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
# macOS — Xcode Command Line Tools
xcode-select --install# Clone and install
git clone <repo-url>
cd FetchBoyApp
yarn install
yarn tauri devAfter downloading bundle, windows defender may prompt you not to run the unsigned application, this is normal. In the "Don't Run" screen, click to see more details and then run it.
⚠️ Disclaimer: Fetch Boy is currently in early development. The app has not been signed or notarized by Windows App Store (or associated partners) yet, which means Windows Defender may show warnings when trying to run it. This can be bypassed as above by ignoring the warning when launching the application. Once the app reaches a more stable release, proper signing and notarization will be set up.
After downloading or building the .app bundle, you may need to remove the extended attribute quarantine flag to run the app:
xattr -cr /Applications/Fetch\ Boy.appThen open the app from Applications as usual.
⚠️ Disclaimer: Fetch Boy is currently in early development. The app has not been signed or notarized by Apple yet, which means Gatekeeper may show warnings when trying to run it. Use thexattrcommand above to bypass these restrictions. Once the app reaches a more stable release, proper signing and notarization will be set up.
Haven't tested the builds yet, if testing please raise any issues in the issues section!
- UI speed seems quite sluggish on Windows 11 - Not sure why.
FetchBoyApp/
├── ./ # Vite + React frontend + Tauri config
│ ├── src/ # React components, stores, hooks
│ ├── src-tauri/ # Rust source, tauri.conf.json, icons
│ └── package.json
