Dev & Data ToolboxAPI Request Builder & Tester
Build and test HTTP requests with a Postman-like interface
Saved Requests
No saved requests
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API Request Builder & Tester
A powerful, privacy-first API testing tool that works entirely in your browser. Build and test HTTP requests with a Postman-like interface without any server uploads or data collection. Perfect for developers, QA engineers, and anyone who needs to test APIs quickly and securely.
This tool supports all major HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS), custom headers, request bodies, and multiple authentication methods. All requests are made directly from your browser, ensuring complete privacy and security.
How to Use in 3 Steps
Configure Request
Enter the URL, select HTTP method, add headers, and configure authentication. For POST/PUT requests, add your request body in JSON, XML, or any format.
Send Request
Click the "Send" button to execute your request. The tool will display response status, headers, body, timing, and size information in real-time.
Save & Reuse
Save your requests locally for future use. All requests are stored in your browser's localStorage, so they persist between sessions and remain private.
Key Features
All HTTP Methods
Support for GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS methods
Custom Headers
Add, edit, and remove custom HTTP headers with ease
Authentication Support
Basic Auth, Bearer Token, and API Key authentication methods
Request Body
Support for JSON, XML, form data, and any text-based request body
Response Analysis
View status codes, response headers, timing, and formatted response body
Local Storage
Save and manage requests locally in your browser for future use
CORS Support
Built-in CORS handling for cross-origin requests
Dark Mode
Full dark mode support for comfortable development
Use Cases
API Development
Test your APIs during development with different parameters, headers, and authentication methods.
- • Test endpoints with various HTTP methods
- • Debug authentication issues
- • Validate request/response formats
API Documentation
Create and save example requests for API documentation and team collaboration.
- • Save example requests
- • Share request configurations
- • Document API workflows
QA Testing
Perform manual API testing with different scenarios and edge cases.
- • Test error scenarios
- • Validate response formats
- • Performance testing
Learning APIs
Explore and understand third-party APIs by testing different endpoints and parameters.
- • Explore API endpoints
- • Understand authentication
- • Learn request/response patterns
Frequently Asked Questions
Is my data safe when using this tool?
Yes, 100% safe! All requests are made directly from your browser to the target API. No data passes through our servers. Your requests, headers, and responses are only visible to you and the target API.
Can I save my requests for later use?
Yes! All requests are saved locally in your browser's localStorage. They persist between sessions and remain completely private. You can save, edit, and delete requests as needed.
What authentication methods are supported?
The tool supports Basic Authentication (username/password), Bearer Token authentication, and API Key authentication. You can also add custom authentication headers manually.
Can I test APIs that require CORS?
The tool handles CORS automatically for most APIs. However, some APIs may block requests from browsers due to their CORS policy. In such cases, you may need to use a server-side solution or contact the API provider.
What file formats can I use for request bodies?
You can use any text-based format including JSON, XML, form data, plain text, or any custom format. The tool will send the body exactly as you type it, with the Content-Type header you specify.
How is this different from Postman?
This tool is completely free, runs entirely in your browser, and doesn't require installation. All data stays local to your browser, providing better privacy. It's perfect for quick API testing without the overhead of a full application.
Can I export my requests?
Currently, requests are stored locally in your browser. You can copy request details manually, and we're working on export functionality for future versions.
What browsers are supported?
The tool works in all modern browsers including Chrome, Firefox, Safari, and Edge. It requires JavaScript to be enabled and uses the Fetch API for making HTTP requests.
Technical Information
Browser Compatibility
- • Chrome 60+
- • Firefox 55+
- • Safari 11+
- • Edge 79+
Features
- • Fetch API for HTTP requests
- • localStorage for data persistence
- • CORS support
- • Real-time response timing
Privacy & Security
Your privacy and security are our top priorities. This API Request Builder operates with complete transparency:
- • No server processing: All requests are made directly from your browser to the target API
- • No data collection: We don't see, store, or log any of your requests or responses
- • Local storage only: Saved requests are stored in your browser's localStorage
- • No tracking: No cookies, analytics, or tracking mechanisms
- • Open source: The code is transparent and can be audited