Captain API - Postman-like Client

Captain API is a modern, desktop-based API testing client built with cutting-edge technologies (Go + Vue3 + Wails3) that provides developers with a powerful, Postman-like interface for testing and managing HTTP APIs.

What is Captain API?

Captain API is a free, open-source API testing tool designed to streamline the API development and testing workflow. Whether you're a backend developer, frontend engineer, or QA tester, Captain API provides an intuitive interface to send HTTP requests, organize API collections, and analyze responses efficiently.

Why Choose Captain API?

✅ Free & Open Source - No subscription fees or usage limits
✅ Privacy-First - All data stored locally on your machine
✅ Fast & Lightweight - Native desktop performance
✅ Cross-Platform - Works on Windows, macOS, and Linux

Captain API empowers developers to test, debug, and document APIs efficiently with a tool that prioritizes simplicity, performance, and developer experience.

Screenshots

Modern API testing interface with request builder and response viewer

Features

🚀 Core Features

• HTTP Request Builder: Support for GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS methods
• Request Management: Save, organize, and reuse requests in collections
• Response Viewer: Beautiful response display with syntax highlighting
• Headers Management: Easy-to-use interface for managing request headers
• Body Support: JSON, text, and raw body types
• Collections: Organize requests into collections for better management
• Persistent Storage: Requests are saved locally for future use

🎨 UI Features

• Modern Interface: Clean, responsive design inspired by Postman
• Tabbed Interface: Separate tabs for headers, body, and response
• Real-time Response: Live response display with status codes, timing, and size
• JSON Formatting: Automatic JSON formatting and validation
• Copy to Clipboard: Easy copying of response data

Getting Started

Prerequisites

• Go 1.22+
• Node.js 18+
• Bun (package manager)
• Wails v3

Installation

1. Install Wails3 (if not already installed):

   go install github.com/wailsapp/wails/v3/cmd/wails3@latest

2. Clone the repository (if not already done):

   git clone https://github.com/JessonChan/captain-api
   cd captain-api

3. Install dependencies and build:

   # This will automatically install frontend dependencies, 
   # generate bindings, and build the application
   wails3 build

   Or for development with auto-reload:

   wails3 dev

Development

To run the application in development mode with hot reload:

wails3 dev

This will start the application with:

• Hot reload for frontend changes
• Automatic Go code recompilation
• Debug console access

Production Build

To create a production build:

wails3 build

The built application will be available in the build/bin/ directory.

Generate Bindings

If you modify Go services and need to regenerate frontend bindings:

wails3 generate bindings

This provides:

• Browser developer tools access
• Console logging
• Hot reload for faster development

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• Built with Wails - Go + Web frontend framework
• Inspired by Postman
• Icons and styling inspired by modern API tools

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Happy API Testing! 🚀