Read JSON from stdin and pretty print

pretty.js

var json = "";

process.stdin.setEncoding('utf8');

process.stdin.on('readable', () => {
  var chunk = process.stdin.read();
  if (chunk !== null) {
    json += `${chunk}`;
  }
});

process.stdin.on('end', () => {
  console.log(JSON.stringify(JSON.parse(json), null, 2));  
});

Usage:

$ curl http://my.json/exaample | node pretty.js