Need help with taking screenshot of react webpage

[Gunner17]

Can someone help me with 'specific examples' of how to take screenshots of a react webpages (renders at the following url in my local machine : http://localhost:3400/api/email).

Since I have just started using Node/react, a detailed example/reference link would save my struggle.
I want to access the react webpage content to construct my email body and send it through nodemailer.