nodejs neeson template with back pressure

ndjson-sample.js

// Try this with: seq 1 10 | node ndjson.js
// Don't forget to npm install ndjson

const ndjson = require('ndjson')
const parser = ndjson.parse();
const printer = ndjson.serialize();

printer.pipe(process.stdout);

process.stdin
.pipe(parser)
.on('data', function(obj) {
  console.error('GOT', obj)
  parser.pause();
  setTimeout(() => {
    printer.write({...obj, processed: true});
    parser.resume();
  }, 1000);
})