Thanks for the suggestion.
However now I am facing another issue. I am told that, In the server, I can not run npm command at all which means I can not run the "npm install jsreport-wkhtmltopdf" command. Is there any other option available so I can download the server & also enable the wkhtmltopdf extension by not using npm install command mentioned above in the server?
Please better formulate your questions - How to authenticate? Is really not enough.
Are you able to login with this user and render the particular template in studio?
Is it admin user or a custom user created in studio?
If it is only problem of your client API call, can you try to use request package and post here full code?
Maybe you could also try to use markdown formatting to highlight code https://help.github.com/articles/creating-and-highlighting-code-blocks/
Ah, that makes sense. So once jsreport dependencies are verified then jsreport's package.json will be updated and it's version incremented and then jsreport-studio dependency on jsreport will be incremented. I will reinstall jsreport-wkhtmltopdf using npm install -save into jsreport-studio so that that dependency is tracked as well.
Playground should not be used for development. Its purpose is to quickly show demos or replicate the problems.
You should not develop your templates there. You should probably startup your own server or us jsreportonline.