Online API Client

DataFormatter API Client is a free online tool that builds GET, POST, PUT and DELETE requests with headers, auth and JSON bodies and sends them straight from your browser — with no proxy, proxy logging or account.

About this tool

What is it?: DataFormatter API Client is a free online tool that builds GET, POST, PUT and DELETE requests with headers, auth and JSON bodies and sends them straight from your browser.
Who is it for?: Developers and testers who want to exercise a REST API quickly with full control over headers and auth.
What makes DataFormatter's tool different?: Requests go directly to the endpoint with no server-side proxy, so nothing is forwarded, logged or uploaded.

What the API Client does

Build and send GET, POST, PUT and DELETE requests with a full set of headers, authentication and a JSON body.
Import a cURL command to reconstruct the exact request you are debugging.
See raw response status, headers and body, then funnel them into related tools for formatting or inspection.
Send directly to the endpoint — no server-side proxy sits between you and the target.

API Client vs API Tester

DataFormatter offers two doors into the same in-browser request engine. This API Client page and the API Tester both build and send GET, POST, PUT and DELETE requests straight to the endpoint with no proxy — the same tool, presented with slightly different emphasis. Start here for the full story, or reach for the API Tester for a quick send-and-inspect pass. After a response comes back, the HTTP Header Inspector can analyze its headers for security and caching issues.

When to use an in-browser API client

Debugging an endpoint

Replay a request and inspect the raw response while you iterate on headers or the body.

Trying authentication

Test bearer tokens, basic auth or custom headers against a local or staging server.

Reproducing a cURL call

Paste a cURL command to import it, then tweak and resend it without leaving the tab.

Why direct-from-browser requests matter

Because the client has no server-side proxy, your request goes straight to the target endpoint. That means there is no third-party service that could log, cache or forward your payload — which is important when you are testing against internal or token-protected APIs with sensitive data.

Frequently asked questions

Is DataFormatter's API Client free and does it need an account?

Yes, it is completely free with no account or signup required. You can build and send requests straight from your browser.

Does the API Client send my requests through a proxy?

No. Requests are sent directly to the target endpoint from your browser — there is no server-side proxy, so nothing is forwarded, logged or uploaded.

Which HTTP methods and features does it support?

It supports GET, POST, PUT and DELETE with custom headers, auth and JSON bodies, and can import a cURL command to reconstruct a request.

Why might a request fail in the browser?

Because requests go directly to the endpoint, cross-origin calls only succeed if that endpoint allows them via CORS. This is what keeps the request between you and the target — no intermediate service.

Related tools

Last reviewed September 2026 · DataFormatter team — this tool processes data locally in your browser.