unlike express there in no req.body object. Therefore it is handle by request handlers. You can follow this article.

https://nodejs.org/en/learn/modules/anatomy-of-an-http-transaction#request-body

 let incomingData=[];
        req.on('data',chunk=>{
            incomingData.push(chunk)
        })
        .on('end',()=>{
            incomingData = Buffer.concat(incomingData)
            let name=JSON.parse(incomingData.toString())
            console.log("converted to string",name.name)
        })