Top Useful Web Apis In 2021

This Web Audio API allows you to manipulate an audio stream, on the web. It can be used to add effects and filters to an audio source on the web. 

This API enables fullscreen-mode in web apps. It lets you select the Element you want to view in fullscreen mode. In Android phones, it will remove the browser's window and the Android top status bar (where the network status, battery status, etc. are displayed). 

This API provides us with the capabilities to add speech synthesis and speech recognition to our web app. With this API we will be able to issue voice commands to our web apps, the same way we do on Android via its Google Speech or in Windows using Cortana. 

This API lets us access the Bluetooth Low Energy device on our phone and use it to share data from a webpage to another device. Imagine being able to create a web chat app that can send and receive messages from other phones via Bluetooth.

This API allows two scripts in different browser contexts to communicate and pass messages to each other in a two-way channel. The different browser contexts can be two scripts running in different tabs, two iframes in a script, the document and an iframe in a script, etc.