Is it possible to make such a service in the form of a Web App ?

Yes, it is possible to create a service in the form of a web app. Web application development https://inoxoft.com/service/web-application-development-services/ involves designing and building interactive applications that can be accessed through a web browser. To develop a web app, you should consider hiring experienced web developers who have expertise in programming languages like HTML, CSS, and JavaScript. Additionally, it's important to plan the features and functionality of your web app carefully to ensure it meets the needs of your users.

Hey Shrini, We recently launched Postman on the Web feature to use on a browser. Make sure to install the Postman Agent file to bypass any CORDS limitations. https://blog.postman.com/introducing-the-postman-agent-send-api-requests-from-your-browser-without-limits/

Not available as web app. However you can either download it as a setup for your Mac or PC or you can add it as a chrome extension and use it.