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Send HTTP requests and inspect responses.
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Among ToolsMonk's developer tools, API Request Tester covers a single everyday need: send http requests and inspect responses. Open the page and start working, with no download or sign-up standing between you and the result.
Typical jobs it handles include quickly testing an api endpoint without installing a desktop client, checking a response's status code, headers, and json body, and debugging a request by tweaking headers or body and resending. The same page works on desktop, tablet, and mobile, so it is equally quick for a single urgent task and for work you repeat every week.
Everything about API Request Tester is tuned for speed to first result, with privacy-friendly processing and the rest of ToolsMonk's tools nearby when the next task comes up.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | Server-assisted, requires an internet connection |
| Account required | None |
| Category | Developer Tools |
Enter the URL and choose the HTTP method
Add any headers and a request body if needed
Send the request
Inspect the status, headers, and response body
Send HTTP requests (GET, POST, and more) and inspect the response
Set method, URL, headers, and request body
View response status, headers, and body in a readable form
A lightweight, in-browser alternative to heavier API clients
Runs in your browser, requests go directly from your device
Free, with no signup and no rate limit
Quickly testing an API endpoint without installing a desktop client
Checking a response's status code, headers, and JSON body
Debugging a request by tweaking headers or body and resending
Verifying an API works as expected during development
API Request Tester was built so that anyone, professional or first-time visitor, gets what the page promises (send http requests and inspect responses) in seconds. Results are instant and accurate, and nothing needs to be installed or signed up for along the way.
The heavy conversion step runs on ToolsMonk's servers over a secure connection, and results are returned straight to your browser. The interface adapts to any modern browser and screen size, so the Developer Tools workflow you rely on at a desk is the same one you get on a tablet or phone.
API Request Tester lets you send HTTP requests and inspect the responses straight from your browser, a fast, install-free way to check an endpoint's status code, headers, and body without opening a heavyweight client.
You control the method, URL, headers, and body, and see back the status, response headers, and a readable body (JSON is formatted for you). For quick verification during development, does this endpoint return what I expect?, that's usually all you need.
The one thing to understand is CORS. Because requests originate from your browser, they obey the same cross-origin rules as any web page: an API that doesn't send permissive Access-Control-Allow-Origin headers will block the call even though the API is fine. That's browser security, not a tool limitation, server-only APIs are better tested with curl or a desktop client.
Requests go directly from your device to the target API; ToolsMonk doesn't proxy or store them, so any tokens you include reach only the API you're calling, test trusted endpoints accordingly. Pair it with the HTTP Header Parser to dig into the headers a response returns.
If you hit a CORS error, the API likely isn't meant to be called from a browser, test it with curl or a desktop client instead
Set the right Content-Type header (e.g. application/json) for POST/PUT, a frequent cause of failed requests
Only send real auth tokens to endpoints you trust, since the request goes directly to that API
Common questions about this tool, its workflow, and what to expect before you use it.
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Send HTTP requests and inspect responses.
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