Online API Request Tester
Test REST endpoints instantly with our free API request tester. Send HTTP requests directly from your browser with custom headers and payloads. Try it now.
About API Request Tester
The Doffl API Request Tester is a lightweight, browser-based HTTP client that lets developers and testers inspect and debug REST APIs directly from their device. Send standard HTTP methods without installing heavy desktop software or setting up an account.
Whether you need to verify a third-party webhook, validate request payloads, or inspect server response headers, this tool provides instant status codes and formatted JSON output with zero setup required.
Key features
- Supports standard HTTP methods including GET, POST, PUT, and DELETE
- Custom request headers and authorization token configuration
- Flexible request body formatting for raw JSON, text, and form data
- Formatted response viewing with syntax-highlighted JSON output
- Inspect response status codes, timing metrics, and headers
- Runs directly in your browser with no installation needed
How to use API Request Tester
- Select your target HTTP method such as GET, POST, PUT, or DELETE.
- Enter the complete API endpoint URL into the address field.
- Add required request headers or authentication tokens in the headers tab.
- Input your request payload in the body editor if sending data.
- Click Send to execute the request and inspect the formatted response.
Who is it for?
- Backend developers testing newly deployed REST endpoints during development.
- Frontend engineers checking response schemas and status codes before integration.
- QA professionals validating parameter handling without installing desktop clients.
- DevOps engineers performing quick endpoint health and connectivity checks.
Frequently asked questions
Is this API request tester free to use?
Yes, this tool is completely free with no account or registration required for standard testing.
Can I use this tool as a lightweight Postman alternative?
Yes, it provides the core functionality needed to dispatch HTTP requests, configure custom headers, and inspect payloads directly in your browser without installing software.
Can I send custom authentication headers and API keys?
Yes, you can configure any custom HTTP headers, including Authorization bearer tokens, custom API keys, and Content-Type declarations.
Why do I see a CORS error when testing an endpoint?
CORS errors happen when the target server restricts browser-based requests from external origins. To test endpoints that restrict origins, configure your API server to return appropriate Access-Control-Allow-Origin headers.
Are my API requests and authentication tokens stored?
No, requests are dispatched directly from your browser, ensuring your payloads and sensitive credentials are not stored or logged on our servers.