API Tester Pro: Test APIs Directly from Your Browser

API Tester Pro is a browser extension designed to simplify API testing, debugging, and documentation for developers and QA engineers. Whether you're working with REST, GraphQL, or WebSockets, API Tester Pro provides an all-in-one solution to test endpoints, manage environments, and automate workflows—without leaving your browser.

With API Tester Pro, you can send requests, inspect responses, and organize your API workflows efficiently. It’s a perfect alternative to standalone tools like Postman or Insomnia, offering seamless integration with your browser’s developer tools.

Why API Tester Pro?

Testing APIs traditionally requires switching between multiple tools or applications. API Tester Pro eliminates this friction by bringing all the functionality you need into your browser. Whether you’re debugging a backend service, testing a third-party API, or documenting your endpoints, API Tester Pro provides a fast, intuitive, and powerful solution.

Core Features

1. REST & GraphQL Support:

   • Test REST APIs with support for all HTTP methods (GET, POST, PUT, DELETE, etc.).

   • Send GraphQL queries and mutations with an intuitive editor and syntax highlighting.

2. Environment Management:

   • Create and manage multiple environments (e.g., Development, Staging, Production) with different base URLs and variables.

   • Use environment variables in your requests for dynamic values (e.g., API keys, tokens).

3. Request Builder:

   • Build requests with a user-friendly interface for headers, query parameters, and body content.

   • Supports form-data, x-www-form-urlencoded, raw JSON, and binary data.

4. Response Inspector:

   • View detailed responses, including status codes, headers, and body content.

   • Pretty-print JSON responses for easy readability.

5. Automated Testing:

   • Write and run automated test scripts using JavaScript to validate API responses.

   • Save and reuse test suites for regression testing.

6. Collections & Documentation:

   • Organize API requests into collections for better workflow management.

   • Generate API documentation automatically from your requests and responses.

7. WebSocket Testing:

   • Test WebSocket connections with real-time message sending and receiving.

8. Authentication Support:

   • Handle OAuth 2.0, API keys, JWT, and Basic Auth with built-in authentication helpers.

9. History & Saved Requests:

   • Keep a history of sent requests for quick reuse.

   • Save frequently used requests for future reference.

10. Cross-Browser Support:

    • Works seamlessly in Chrome, Firefox, and Edge, ensuring consistency across browsers.

11. Dark Mode & Customization:

    • Switch between light and dark themes for comfortable usage in any environment.

    • Customize the layout and appearance to suit your workflow.

12. Collaboration Features:

    • Share API collections and environments with your team for collaborative testing.

    • Export and import requests in OpenAPI (Swagger) and Postman formats.

Use Cases

• Backend Development: Test and debug your REST or GraphQL APIs during development without switching tools.

• Third-Party API Integration: Quickly test and validate external APIs (e.g., payment gateways, social media APIs) directly from your browser.

• QA & Testing: Automate API testing with scripts and validate responses against expected outcomes.

• API Documentation: Generate automated API documentation from your requests and share it with your team or stakeholders.

• WebSocket Debugging: Test real-time WebSocket connections for chat apps, gaming platforms, or live updates.

• Education & Learning: Ideal for students and beginners learning API development, with an intuitive interface and detailed response inspection.

How API Tester Pro Works

API Tester Pro integrates directly into your browser as an extension. Once installed, it adds a dedicated API testing interface that you can access from the browser toolbar or Developer Tools. The extension intercepts and manages API requests, allowing you to send, inspect, and automate tests without leaving your browser.

API Tester Pro is designed with performance and security in mind. All sensitive data, such as API keys and tokens, is encrypted and stored locally, ensuring your credentials remain secure.

Key Features

Feature Title: REST & GraphQL Testing Feature Description: Test REST APIs with all HTTP methods and send GraphQL queries/mutations with syntax highlighting and autocompletion.

Feature Title: Environment Management Feature Description: Create and switch between multiple environments (e.g., Dev, Staging, Prod) with dynamic variables.

Feature Title: Request Builder Feature Description: Build API requests with a user-friendly interface for headers, query parameters, and body content (JSON, form-data, etc.).

Feature Title: Response Inspector Feature Description: Inspect detailed API responses, including status codes, headers, and pretty-printed JSON bodies.

Feature Title: Automated Testing Feature Description: Write and run JavaScript-based test scripts to validate API responses and automate regression testing.

Feature Title: Collections & Documentation Feature Description: Organize API requests into collections and generate automated API documentation for sharing with your team.

Feature Title: WebSocket Testing Feature Description: Test real-time WebSocket connections with message sending and receiving capabilities.

Feature Title: Authentication Support Feature Description: Handle OAuth 2.0, JWT, API keys, and Basic Auth with built-in authentication helpers.

Feature Title: History & Saved Requests Feature Description: Keep a history of sent requests and save frequently used requests for quick reuse.

Feature Title: Cross-Browser Support Feature Description: Works seamlessly in Chrome, Firefox, and Edge for consistent API testing across browsers.

Feature Title: Dark Mode & Customization Feature Description: Switch between light and dark themes and customize the layout to fit your workflow.

Feature Title: Collaboration Features Feature Description: Share API collections and environments with your team and export/import requests in OpenAPI or Postman formats.

Getting Started

Step 1: Install API Tester Pro

1. Visit the Chrome Web Store, Firefox Add-ons, or Microsoft Edge Add-ons.

2. Search for API Tester Pro and click Add to Browser.

3. Pin the extension to your toolbar for easy access.

Step 2: Open API Tester Pro

1. Click the API Tester Pro icon in your browser toolbar to open the extension.

2. Alternatively, open it from the Developer Tools panel.

Step 3: Create a New Request

1. Click New Request to open the request builder.

2. Enter the API endpoint URL (e.g., https://api.example.com/users).

3. Select the HTTP method (e.g., GET, POST).

Step 4: Configure Headers & Parameters

1. Add headers (e.g., Content-Type: application/json).

2. Include query parameters or body content (JSON, form-data, etc.).

3. For authenticated APIs, configure authentication (e.g., Bearer Token, API Key).

Step 5: Send the Request

1. Click Send to execute the request.

2. View the response in the Response Inspector, including status code, headers, and body.

Step 6: Save the Request

1. Click Save to add the request to a collection.

2. Organize requests into folders for better management.

Step 7: Automate Testing

1. Navigate to the Tests tab in the request builder.

2. Write JavaScript test scripts to validate the response (e.g., status code, response body).

3. Run the tests and review the results.

Step 8: Share with Your Team

1. Export the collection as a JSON file or OpenAPI specification.

2. Share the file with your team or import it into other API testing tools.

Step 9: Test WebSockets

1. Switch to the WebSocket tab.

2. Enter the WebSocket URL (e.g., wss://example.com/ws).

3. Send and receive real-time messages to test WebSocket connections.

Step 10: Customize Your Workspace

1. Go to Settings to customize the theme (light/dark) and layout.

2. Adjust font size, panel positions, and shortcuts to fit your workflow.