RunKit + npm: markdown-it

var markdownIt = require("markdown-it") var zero1 = markdownIt('zero', { breaks: true }).enable('newline'); var zero2 = markdownIt('zero', { breaks: true }); var regular = markdownIt({ breaks: true }); var sample = 'this _is_ a test\nhello world!'; var result = { zero1: zero1.render(sample), zero2: zero2.render(sample), regular: regular.render(sample), options: { 1: zero1.options, 2: zero2.options } };