API Request Tester
Test API endpoints with collections, authentication, environments, and code generation
Privacy-first API testing
Requests are sent directly from your browser to the target API. No data is sent to our servers or proxied by Inspectly, but any headers, tokens, or body content you include will be sent to that API.
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Send a request to see the response
API Tester & REST Client — Free Online Tool
Test REST APIs directly in your browser with inspectly.dev's API Tester. Send GET, POST, PUT, PATCH, and DELETE requests with custom headers, authentication, and JSON body — see formatted responses instantly. A free, privacy-first alternative to Postman and Insomnia.
Key Features
- Support for GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS methods
- Custom request headers with preset templates (Authorization, Content-Type)
- JSON request body editor with syntax validation
- Bearer token, API Key, and Basic Auth authentication helpers
- Response viewer with formatted JSON, headers, and status codes
- Request history saved locally in the browser
- Environment variables for switching between dev and production
- cURL command generation for any request
Common Use Cases
- Testing REST API endpoints during development
- Debugging authentication issues with Bearer tokens or API keys
- Exploring third-party API documentation by sending live requests
- Verifying API response structure before writing frontend code
- Sharing API request examples with teammates
- Quick HTTP debugging without installing Postman or curl
Frequently Asked Questions
How do I test an API online without Postman?
Use inspectly.dev/api — enter your endpoint URL, select the HTTP method, add headers and a request body, then click Send. The response is displayed with formatting and status code. No installation or account needed.
Can I send POST requests with a JSON body?
Yes. Select the POST method, click the Body tab, choose JSON, and paste or type your request body. The tool validates the JSON before sending and automatically sets the Content-Type header.
Does this support CORS-restricted APIs?
Requests are made directly from your browser, so they are subject to the same CORS restrictions as any browser-based client. If the API allows cross-origin requests, it works. For CORS-restricted APIs, consider using the API's own sandbox.
Is my API data secure?
All requests are made directly from your browser to the target API. inspectly.dev servers never see your request data, API keys, or responses. Request history is stored only in your browser's localStorage.