REST API Client Online — No Install Required
Send HTTP requests and inspect API responses directly from your browser. No installation, no account, no hassle. Your API calls run locally — no data leaves your device.
API Client
Lightning-fast REST API testing directly from your local web browser.
What is a REST API client?
A REST API client lets you send HTTP requests — GET, POST, PUT, DELETE — to any endpoint and view the response. Developers use it daily to test API integrations, debug endpoints, and explore third-party APIs before writing code.
Why use this instead of Postman or Insomnia?
Postman requires installation and an account. Insomnia has a sync feature that transmits your requests to the cloud. This tool requires neither. Open it in any browser and start testing APIs instantly — no setup, no tracking, no subscription.
Since it runs entirely in your browser, your API keys, tokens, and request payloads never leave your device.
How to test an API online
- Enter the API endpoint URL
- Select an HTTP method (GET, POST, PUT, DELETE, PATCH)
- Add any required headers (e.g., Authorization, Content-Type)
- Include a request body for POST or PUT requests
- Click Send — the response body and status appear instantly
Privacy-first API testing
Every request you make goes directly from your browser to the target API — nothing passes through our infrastructure. API keys, tokens, and sensitive payloads stay on your machine. No logs, no history stored externally.
Frequently Asked Questions
Can I add custom headers like Authorization tokens?
Yes. You can add any custom headers you need, including Bearer tokens, API keys, and Content-Type overrides.
Does this API tester support POST with a JSON body?
Yes. You can send raw JSON, form data, or any body format supported by the target API.
Is this a free Postman alternative?
Yes. It covers everyday API testing needs with zero setup — completely free and browser-based.
Are my API keys safe to use here?
Yes. No data is transmitted to our servers. Your keys stay in your browser and are sent only to the API endpoint you specify.