API Tester Online – Postman Alternative

API Tester Online is a free Postman alternative that allows developers to test REST APIs directly in the browser. You can send GET, POST, PUT, and DELETE requests with custom headers and JSON body.

Key Features

• ✔ Send HTTP requests (GET, POST, PUT, DELETE)
• ✔ Add custom headers and JSON body
• ✔ Beautified JSON response viewer
• ✔ Fast and secure – runs fully in your browser
• ✔ No login or installation required

Why Use This API Tester?

Unlike desktop tools, this API Tester works instantly without installing any software. It is ideal for quick debugging, learning REST APIs, and testing endpoints securely.

Who Is This Tool For?

This tool is designed for frontend developers, backend developers, mobile app developers, and QA engineers who need a simple yet powerful API testing solution.