Thunder Client is a lightweight REST API client designed as a Visual Studio Code (VS Code) extension. It provides a fast, easy, and user-friendly way to test and develop APIs directly within the VS Code editor.
Why Use Thunder Client?
Thunder Client provides an easy and accessible way for API testing for developers who are already using VS Code. Unlike standalone applications such as Postman, you just need to install an extension to test your API.
Key Benefits
- Seamless Integration: Directly integrates into VS Code, avoiding context switching.
- Lightweight Performance: Uses minimal system resources.
- User-Friendly Interface: Simple UI that is easy to understand.
Key Features of Thunder Client
- VS Code Integration: Thunder Client works entirely within VS Code, eliminating the need for a separate application.
- Simple UI for API Requests: The interface is easy to use, allowing users to create and manage API requests quickly.
- Support for Various Request Types: Supports all the HTTP methods such as GET, POST, PUT, DELETE, PATCH, etc.
- GraphQL Support: Users can also able to test the GraphQL queries in Thunder Client itself.
- Local Data Storage: All data is saved locally on your device, and it can be synced with Git for version control.
- Scriptless Testing: Allows users to perform basic testing and validation of API responses directly through a graphical interface.
- Fast and Lightweight: Designed for speed, it quickly executes requests and renders responses, making it highly efficient.
Getting Started with Thunder Client
Step 1: Install the Thunder client by searching the extensions tab on the VS Code

2. Opening Thunder Client
After installation, you will see a Thunder Client icon in the sidebar of VS Code. Clicking on this icon will open the Thunder Client interface.

Step 3: Creating Your First API Request
- Click on the "New Request" button.
- Select the HTTP method (e.g., GET, POST).
- Enter the API endpoint URL in the URL bar.
- Optionally, you can add headers, parameters, and body content as needed.
- Click "Send" to execute the request and view the response.

Comparing Thunder Client to Postman
| Feature | Thunder Client | Postman |
|---|---|---|
| Platform | VS Code Extension | Standalone Application |
| User Interface | Integrated within VS Code | Separate application with rich UI |
| Collaboration | Local sync, Git integration | Real-time collaboration with shared workspaces |
| Testing Capabilities | Scriptless basic testing | Advanced scripting and automation |
| Performance | Lightweight and fast | More features, heavier performance |
| GraphQL Support | Basic support | Comprehensive support |
| Mock Servers | No | Yes |
| Cost | Free | Free & Paid Plans |