Free Online API Request Tester Tool
Send HTTP requests to any API endpoint and inspect responses in real-time. Supports GET, POST, PUT, DELETE, PATCH methods with custom headers, JSON body, query parameters, and authentication. Perfect for testing REST APIs during development. 100% client-side.
Uses browser Fetch API · May be subject to CORS policy · No proxy server
How to Use the API Request Tester Tool
Enter Request URL
Type or paste the API endpoint URL and select the HTTP method (GET, POST, PUT, DELETE, PATCH).
Configure Request
Add headers, query parameters, a JSON body, and authentication if needed. All fields are optional.
Send & Inspect
Click Send to make the request. View the response status code, headers, and body in a formatted panel.
Powerful API Request Tester Features
Everything you need to test and debug REST APIs — all in one free tool.
All HTTP Methods
Supports GET, POST, PUT, DELETE, PATCH, and HEAD methods for comprehensive API testing.
Custom Headers
Add any number of custom HTTP headers including Content-Type, Authorization, and API keys.
JSON Body Editor
Built-in JSON editor for request body with validation and syntax highlighting.
Query Parameters
Add URL query parameters with a simple key-value interface that updates the URL automatically.
Response Inspector
View response status code, timing, response headers, and formatted JSON body.
Authentication
Quick-add common auth headers: Bearer token, Basic Auth, or custom API key headers.
History & Sample
Load sample API requests to get started quickly.
100% Client-Side
Requests are sent directly from your browser using the Fetch API. No proxy servers, no data logging.
Why Use Our API Request Tester Tool
The simplest way to test REST APIs directly from your browser. No setup, no installations.
100% Free
No hidden fees, no usage limits. Send as many API requests as you need.
No Setup Required
Works directly in your browser. No Postman installation, no account needed.
Direct Requests
Requests are sent directly from your browser — no proxy or intermediary server.
Developer-Friendly
Perfect for testing REST APIs, debugging endpoints, and exploring API responses during development.
Key Highlights
- No sign-up required
- Direct browser fetch (no proxy)
- Supports all HTTP methods
- Formatted JSON response viewer
- Custom headers & auth support
- Works on any device
Frequently asked questions
What is an API request tester?
An API request tester lets you send HTTP requests to API endpoints and inspect the responses. It's essential for developing and debugging REST APIs without writing code or installing separate tools like Postman.
Is this API tester really free?
Yes, completely free. No hidden charges, no usage limits.
Is my API data secure?
Requests are sent directly from your browser using the Fetch API. However, note that CORS policies may block requests to some APIs. For security, sensitive tokens should only be used with APIs you trust.
Why do some requests fail with CORS errors?
CORS (Cross-Origin Resource Sharing) is a browser security feature. Some APIs block requests from browser-based tools. This is a browser limitation, not a tool limitation. Consider using a server-side tool for those APIs.
What content types are supported?
The tool supports JSON (application/json), form data, and text content types. Set the Content-Type header to match your request body format.
Can I view response headers?
Yes! The response panel shows all response headers, status code, and timing information alongside the formatted response body.
How do I add authentication?
Use the Auth section to select Bearer Token (adds Authorization: Bearer <token>), Basic Auth (adds Authorization: Basic <base64>), or add custom auth headers manually.
Do I need to install anything?
No installation required. Works entirely in your web browser.
Can I use this on my phone?
Yes, fully responsive and works on all devices.