A simple example converting jsonld to nquads

jsonldtonquads.js

var jsonld = require('jsonld');

var doc =
{
  "@context": "http://json-ld.org/contexts/person.jsonld",
  "@id": "http://dbpedia.org/resource/John_Lennon",
  "name": "John Lennon",
  "born": "1940-10-09",
  "spouse": "http://dbpedia.org/resource/Cynthia_Lennon"
};

// serialize a document to N-Quads (RDF)
jsonld.toRDF(doc, {format: 'application/nquads'}, function(err, nquads) {
  console.log(nquads);
  // nquads is a string of nquads
});