API & cURL Test Tool
Advanced API Testing and cURL Command Execution Tool
This comprehensive API testing platform provides developers, QA engineers, and technical teams with a powerful interface for testing REST APIs, executing HTTP requests, and validating API responses. The tool supports all standard HTTP methods including GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS, making it suitable for testing any RESTful API endpoint.
Test APIs with Multiple HTTP Methods
Send HTTP requests using any standard method to test API endpoints thoroughly. GET requests retrieve data from servers, POST requests submit new data, PUT requests update existing resources, DELETE requests remove resources, PATCH requests apply partial modifications, HEAD requests fetch headers without body content, and OPTIONS requests discover supported methods.
Execute and Parse cURL Commands
Import and execute cURL commands directly without manual conversion. Paste any cURL command into the interface, and the tool automatically parses the URL, HTTP method, headers, and request body. The parser handles complex commands with multiple headers, authentication tokens, and request payloads.
Custom Headers and Authentication
Configure custom HTTP headers using JSON format to test authenticated endpoints and specialized API requirements. Add authorization tokens, API keys, content-type specifications, user-agent strings, and any custom headers required by the API. Supports OAuth tokens, Bearer authentication, Basic authentication, and custom API key headers.
Request Body Configuration
Send JSON payloads, form data, XML, or raw text in request bodies for POST, PUT, PATCH, and DELETE operations. The body editor provides a dedicated interface for composing request data with proper formatting and validation. Test complex data structures, nested objects, arrays, and any payload format required by the API endpoints.
Real-Time Response Display
View formatted API responses immediately after request execution. The response viewer displays JSON data with proper indentation, HTTP status codes with color-coded badges, response headers, and error messages. Status codes are visually categorized: green for success (200-299), yellow for client errors (400-499), and red for server errors (500-599).
Request History Tracking
Automatically save and retrieve previous API requests with full configuration details. The history feature stores the last 10 requests including URLs, methods, headers, body content, and timestamps. Click any historical request to instantly reload its complete configuration, eliminating repetitive data entry.
Built-in Rate Limiting Protection
Automatic cooldown mechanism prevents accidental request flooding and protects against rate limit violations. After sending a request, a 5-second cooldown period prevents immediate re-submission, giving time to review responses and preventing unintentional API abuse. The cooldown timer persists across page refreshes.
Dark Mode Support
Toggle between light and dark themes for comfortable testing in any lighting condition. The theme switcher provides instant visual transformation with carefully designed color schemes optimized for readability. Dark mode reduces eye strain during extended testing sessions and late-night debugging.
How to Use
How to Test API Endpoints
Begin by selecting the appropriate HTTP method from the dropdown menu based on the operation to perform. Enter the complete API endpoint URL including protocol, domain, path, and any query parameters. Switch to the Headers tab to add authentication tokens or custom headers in JSON format. For methods that accept request bodies (POST, PUT, PATCH, DELETE), switch to the Body tab and enter the payload data. Click the Send Request button to execute the API call and view the response with status code in the response area below.
Testing Authenticated APIs
Test protected endpoints by configuring authentication headers in the Headers tab. For Bearer token authentication, add a JSON object with the Authorization key and value in the format "Bearer YOUR_TOKEN". For API key authentication, include the appropriate header key required by the API documentation, such as "X-API-Key" or "API-Key" with the corresponding value.
Working with JSON APIs
Test JSON-based REST APIs by setting the Content-Type header to "application/json" in the Headers tab. Structure request data as valid JSON in the Body tab, ensuring proper syntax with quoted keys, appropriate data types, and correct nesting. The tool accepts complex JSON structures including nested objects, arrays, boolean values, numbers, and null values.
Key Features
Browser-Based API Testing
Access the complete API testing functionality directly through a web browser without installing desktop applications, browser extensions, or command-line tools. Works seamlessly across Windows, macOS, Linux, and mobile platforms.
Progressive Web App Capabilities
Functions as a Progressive Web App (PWA) with offline capabilities and installable functionality. Service worker technology enables the interface to load even without internet connectivity, making it useful for testing local development servers and internal APIs.
Use Cases for API Testing
Validate REST API endpoints during development, debug API integration issues, verify API behavior after deployments, test third-party APIs before integration, explore public APIs, validate API documentation accuracy, and conduct API security assessments.
Troubleshooting API Requests
When API requests fail or return unexpected results, examine the HTTP status code badge displayed next to the response. Status codes in the 400 range indicate client-side errors such as malformed requests, missing authentication, or invalid parameters. Status codes in the 500 range indicate server-side errors.
Privacy and Data Storage
Request history and configuration data are stored locally in the browser using local storage technology. No API request data, authentication tokens, or response information is transmitted to external servers beyond the intended API endpoints being tested. All data remains on your device.