REST API Tester: Debug & Validate Endpoints Instantly
No setup, no login—just pure API testing. Send HTTP requests, manage headers, and inspect JSON responses in real-time. The fastest way to validate your RESTful services online.
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About Our REST API Tester Tool
Our REST API Tester is a powerful online tool for developers and QA engineers to test, debug, and interact with RESTful APIs quickly and efficiently. Whether you're working with public APIs, internal microservices, or third-party integrations, this tool helps you send requests and inspect responses — all within your browser and without needing Postman or any installed software.
You can make HTTP requests using GET, POST, PUT, PATCH, and DELETE methods, send custom headers, add query parameters, and include a request body in JSON format. For formatting and validating your JSON payloads, use our JSON Formatter & Validator. View response status codes, headers, and whole response bodies instantly in a clean and user-friendly interface. This tool is fully responsive and works seamlessly on both desktop and mobile.
Whether you're testing a production endpoint or prototyping an internal API, our free online API testing tool makes it easy to validate endpoints, debug issues, and ensure your APIs behave as expected.
Key Features of out REST API Tester tool
- Supports All HTTP Methods: GET, POST, PUT, PATCH, DELETE, OPTIONS, and HEAD.
- Custom Headers & Parameters: Easily add and manage request headers and query parameters.
- JSON Request Body Editor: Paste or write raw JSON to send in POST/PUT/PATCH requests.
- Live Response Viewer: Instantly view response status, headers, and prettified JSON body.
- No Installation Needed: Entirely browser-based. No login or setup required.
- Safe & Secure: Your API keys, tokens, and payloads never leave your browser.
Why Use an Online API Tester?
- Quickly verify if an endpoint is up and responding as expected.
- Debug API errors without needing to install external tools like Postman or Insomnia.
- Collaborate or share reproducible test scenarios with your team.
- Perfect for frontend developers testing APIs during UI integration.
- Explore public APIs, test authentication, and monitor status codes instantly.
Frequently Asked Questions (FAQs)
What is a REST API Tester?
It's a web-based utility that allows developers to send HTTP requests to API endpoints and review the responses in real-time. It simplifies debugging and testing RESTful services.
Is this REST API Tester tool free to use?
Yes! This REST API testing tool is entirely free — no login or subscription required.
Can I use it for secure or authenticated APIs?
Absolutely. You can add authorization headers (like Bearer tokens or API keys) in the Headers section before sending your request.
Can I send JSON payloads?
Yes. The tool supports JSON-formatted request bodies, ideal for POST, PUT, or PATCH requests. If you are working with secure tokens in your payloads, you can also use our JWT Decoder & Encoder to inspect and verify your web tokens effortlessly.
Is my request data stored or logged?
No. All requests are processed directly from your browser, and no data is stored or transmitted elsewhere.
Does this support HTTPS and public APIs?
Yes. You can test both public and private HTTPS endpoints as long as they allow cross-origin requests (CORS).
Can I use this tool on mobile?
Definitely, The REST API Tester is fully responsive and optimized for mobile, tablet, and desktop devices.
Test, Debug & Monitor REST APIs Without Hassle
Our REST API Tester empowers you to test and analyze HTTP APIs quickly — all from your browser. Whether you're debugging a failing endpoint or learning how an API works, this tool keeps things fast, simple, and secure.