compare json via named pipe

index.js

expect = require('chai').expect
diff = require('diff')
require('colors').enabled = true;

process.stdin.setEncoding('utf8');
process.stdin.on('readable', function(){
  var chunk = process.stdin.read();
  if (chunk !== null) {
    try {
      json = JSON.parse(chunk);
      expect(json[0]).to.deep.eql(json[1]);
      process.stdout.write("Success\n");
    } catch(err) {

      var parts = diff.diffJson(err.actual,err.expected)
      parts.forEach(function(part){
        var color = part.added ? 'green' :
          part.removed ? 'red' : 'grey';

        process.stdout.write(part.value[color]);
      });
      process.stdout.write("\nError: " + err + "\n");
    }
  }
});

process.stdin.on('end', function(){
  process.stdout.write('end');
});

package.json

{
  "name": "comp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "chai": "^3.1.0",
    "colors": "^1.1.2",
    "diff": "^1.4.0"
  }
}