Tarasque

A desktop mock API server for designing, testing, and debugging HTTP endpoints. Built with Tauri v2, Rust, and Svelte 5.

Features

• Create and manage multiple API collections
• Define endpoints with multiple response scenarios
• Dynamic response templates with variables ({{uuid}}, {{request.body.field}}, etc.)
• Scenario match rules (route by headers, query params, or body content)
• Sequence mode to cycle responses on each request
• Environment variables per collection
• Proxy forwarding for unmatched routes
• HTTPS alias with self-signed certificates
• Request logging with detail view
• OpenAPI/Swagger import
• Export to JSON or Postman format
• cURL import
• Test suite runner with assertions
• Hot-reload responses without restarting the server
• Monaco editor for response body editing

Tech Stack

• Frontend: Svelte 5, Tailwind CSS, Monaco Editor
• Backend: Rust, Actix-web, Tokio
• Framework: Tauri v2
• Package Manager: Bun

Prerequisites

• Rust
• Bun
• Tauri CLI prerequisites

Development

# Install dependencies
bun install

# Run in development mode
bun run tauri:dev

Production Build

bun run tauri:build

Project Structure

src/                    # Svelte frontend
  lib/
    components/
      editor/           # Endpoint editor, scenario editor, Monaco
      server/           # Server panel, logs, stats
      sidebar/          # Collection list, running APIs, logs sidebar
    stores/             # Svelte stores (collections, server, logs, settings)
    types.ts            # TypeScript types
src-tauri/              # Rust backend
  src/
    server/             # Actix-web mock server (router, state, rules, templates)
    commands.rs         # Tauri commands
    models.rs           # Data models
    storage.rs          # File persistence