API Client - Postman Alternative

A professional desktop application for API testing, built with Python 3 and PySide6.

Features

• Collection Management: Organize HTTP requests in collections
• Request Builder: Create HTTP requests with support for GET, POST, PUT, DELETE, patch, HEAD, OPTIONS
• Headers & Parameters: Add and manage key-value pairs for headers and URL parameters
• Request Body: Support for JSON, XML, and plain text body
• Response Viewer: View formatted response with status code, time, and headers
• Tabbed Interface: Work on multiple requests simultaneously
• Dark Mode: Modern dark theme UI
• Non-blocking Requests: Thread-based HTTP calls prevent GUI freezing

Installation

1. Install requirements:

pip install -r requirements.txt

2. Run the application:

python main.py

Project Structure

Postman_alternative/
├── main.py                 # Entry point
├── models.py              # Data models (RequestData, ResponseData, Collection)
├── main_window.py         # Main application window
├── collection_manager.py  # Sidebar collections management
├── request_builder.py     # URL/method input component
├── request_tab.py         # Request tab with all components
├── key_value_table.py     # Headers/params table widget
├── request_body.py        # Request body editor
├── response_panel.py      # Response viewer
├── http_client.py         # HTTP request worker
├── http_thread.py         # QThread wrapper for HTTP requests
└── requirements.txt       # Python dependencies

Usage

1. Create a new request by clicking "+ New Request" tab
2. Select HTTP method and enter URL
3. Add headers and parameters in respective tabs
4. Optionally add request body for POST/PUT requests
5. Click "Send" to execute the request
6. View response in the response panel

Technical Stack

• GUI Framework: PySide6 (Qt for Python)
• HTTP Library: requests (with threading support)
• Python Version: 3.8+
• Architecture: MVC pattern with Qt's signal-slot mechanism