Turtle to JSON-LD

ttl-to-jsonld.js

const N3 = require('n3'),
      fs = require('fs');

const stream = fs.createReadStream('file.ttl');

var first = true;
console.log('{');
const triples = new N3.Parser().parse(stream, (error, triple) => {
  if (triple) {
    if (first)
      first = false
    else
      console.log(',');
    console.log(convertTriple(triple));
  }
  else {
    console.log(first ? '{}' : '}');
  }
});

function convertTriple({ subject, predicate, object }) {
  return JSON.stringify({
    "@id": subject,
    [predicate]: N3.Util.isLiteral(object) ? N3.Util.getLiteralValue(object) : object,
  }, null, '  ');
}