How to use JSON API Tester
- Start by entering the URL and any method, headers or body in JSON API Tester.
- Press the button and JSON API Tester sends the request from your browser.
- See the response from the API you entered; JSON API Tester only displays what comes back.
About this tool
JSON API Tester is a static, browser-based client. JSON API Tester sends HTTP requests from your browser to the API endpoint you enter and shows the status, headers and body of the response.
Because the call is made by your browser, it follows the same CORS rules as any web page, so some cross-origin APIs may refuse to respond. The request is sent from your browser straight to the API you name; this site has no backend and never receives it, though that server and your network can see it. Cross-origin calls follow the browser's CORS rules, and a connection is required.
Frequently asked questions
How do I use JSON API Tester?
JSON API Tester sends the HTTP request you configure from your browser to the API you specify and shows the response status, headers and body.
Does JSON API Tester cost anything?
No — JSON API Tester is completely free, with no sign-up and no hidden limits.
Does JSON API Tester send my request anywhere?
Yes — JSON API Tester sends the request from your browser directly to the URL you enter. This site has no backend and never receives it, but the target server and your network do, and cross-origin calls follow browser CORS rules.
Can JSON API Tester call any API from the browser?
JSON API Tester can call any endpoint your browser is allowed to reach, but cross-origin APIs must send permissive CORS headers or the browser will block the response — that is a browser rule, not a limit of JSON API Tester.