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Is NodeJs best language for online radio servers?
Best is most of the times 'depends' on multiple things on what you want out of it and how you plan to use it.
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Will I get there with nodejs?
Yes. It is very much possible to make an online radio server using Nodejs.
Shared by someone who tried it:
You can make a Node.js HTTP server that will have an endpoint intended for streaming songs, i.e., audio data. A client could then start consuming the data by making a request to that endpoint.
Try out, share if you face any issue or get stuck.