RunKit + npm: marked

var marked = require("marked") var Slugger = require("github-slugger"); // monkey patching marked.Renderer.prototype.heading = function(text, level, raw) { if (this.options.slugger) { return '<h' + level + ' id="' + this.options.slugger.slug(raw) + '">' + text + '</h' + level + '>\n'; } // ignore IDs return '<h' + level + '>' + text + '</h' + level + '>\n'; }; var options = { slugger: new Slugger() }; var md = `# heading ## heading # heading again ## heading again`; var html = marked(md, options);