Simple CLI for JSON transformation using Node.js streams

toNdjson.js

#!/usr/bin/env node

// Clean up JSON from openlibrary.org and output as NDJSON.
// use:
// curl 'http://openlibrary.org/subjects/love.json' | ./toNdjson.js
var JSONStream = require('JSONStream');
var map = require('through2-map');

var cherryPick = map.obj(function(obj) {
  return {
    key: obj.key,
    title: obj.title,
    authors: obj.authors,
    subject: obj.subject,
  };
});

process.stdin
  .pipe(JSONStream.parse('works.*'))
  .pipe(cherryPick)
  .pipe(JSONStream.stringify(false))
  .pipe(process.stdout);