REST API Client

What is REST API Client?

REST API Client is a free, browser-based HTTP client for calling APIs: send GET, POST, PUT, PATCH, DELETE, HEAD or OPTIONS requests, set headers, auth and a body, then read the status, timing and response. Requests go directly from your browser to the API you name — DataXForge has no server in the path and never sees your requests, your responses or your tokens. Saved collections and environment variables stay in this browser's local storage.

Used by

• Backend developers
• API testers
• QA engineers
• Integration teams
• Analysts
• Researchers

Recommended workflow

1. 1

   Prepare the input

   Profile the data first so missing values, types, duplicates, and outliers are visible before you edit it.

2. 2

   Run REST API Client

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

   Next recommended tool

   API Request Builder: Build an HTTP request visually, then export it as curl, fetch, axios, Python or Go.

   Open tool
4. 4

   Then continue with

   HTTP Header Analyzer: Grade security headers, explain every header, and simulate CORS preflight.

   Open tool
5. 5

   Then continue with

   API Response Inspector: Inspect a response's shape, status, caching and rate-limit signals.

   Open tool

Frequently asked questions

Where do my requests actually go?

Straight from your browser to the URL you enter. DataXForge is a static site with no backend, so there is no server of ours in the path — your requests, responses, headers and tokens are never sent to us and never stored by us.

Why does my request fail with a CORS error when curl works fine?

Because a browser will not let a page read a response from another origin unless that API opts in with an Access-Control-Allow-Origin header. This is a browser security rule, not a limitation we can code around — it is exactly why Postman ships a desktop app. When it happens the tool explains which header is missing and gives you a ready-to-run curl command for your terminal, which has no such restriction.

Why are some headers missing from the response?

Browsers only expose six CORS-safelisted response headers unless the server adds Access-Control-Expose-Headers. The others were sent but the browser hides them from the page. The tool tells you when that is what you are looking at.

Why does it say a header I set will not be sent?

Headers like Host, Origin, Referer, Cookie, User-Agent and Content-Length are controlled by the browser itself and cannot be set from a page. Rather than let the request go out silently different from what you typed, the tool flags them before you send.

Are my saved requests and tokens safe?

Collections and environments are stored only in this browser's local storage — they are never uploaded. Anything on this device can still read local storage, so treat saved tokens like any other credential on your machine. Mark a variable as secret and its value is left out when you export, and credentials are always stripped from a shared link.

Is it free?

Yes — completely free, with no account, no sign-up, and no daily request limit.