Which HTTP methods are supported?

Common REST verbs including GET, POST, PUT, PATCH, DELETE, and HEAD where exposed in the UI.

Can I send JSON bodies?

Yes. Set Content-Type to application/json and paste a JSON payload in the body editor.

Why do I get CORS errors?

Browsers block cross-origin requests unless the API returns permissive Access-Control-Allow-Origin headers.

Is my data uploaded when I use API Client?

No. API Client runs entirely in your browser. Your input never leaves your device.

API Client

Network Live

Send REST HTTP requests with headers, body and view responses.

About this tool

API Client — Send REST HTTP requests with headers, body and view responses. Free, fast and private. Runs entirely in your browser at Quick Calci Tools.

Who uses the API Client?

Common scenarios and audiences for this tool.

API developers

Use the tool for api developers workflows without leaving the browser.

Mobile app teams

Speed up mobile app teams tasks with instant local processing.

QA testers

Handle qa testers checks during development or review.

Technical writers

Support technical writers with a private, signup-free utility.

Students

Ideal for students when you need quick, repeatable results.

Frequently asked questions

Everything you need to know about the API Client.