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I would like to know is there any way to check if user is connected from 2G, 3G, 4G, or WiFi using javascript. As of my knowledge only Mozilla provides a Network Information API which helps to detect general connection type like 'wifi', 'cellular' etc.
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It is a wrong approach to expose your network to javascript. Anyways for your better understanding please go through the below link
How do I check connection type (WiFi/LAN/WWAN) using HTML5/JavaScript?
And there is one that can be of help but only supports mozilla and for the info you can visit the below link
https://developer.mozilla.org/en-US/docs/Web/API/Network_Information_API