Hi, newman already comes with handlebars installed, you don’t need to install it… to get response.body in html report you just need to use a template that reads the response body.
In order to do this you must run Newman with the parameter ‘–reporter-html-template’ informing your template file. To create a template file you could copy the default template that comes with Newman (\node_modules\newman\lib\reporters\html) and create your own in any directory, just pass the fullpath for the file to --reporter-html-template. Do you have any other specific questions?