Keyword search using Node.js server and jQuery-autocomplete client

node-jquery-autocomplete.js

// Server-side
app.get('/keyword/search',
        function (req, res, next) {
          var query = new RegExp('^' + req.query.q + '.*$', 'i');
          var result = [];
          mongodb.keywords.find(
            { word: query }, [ 'word' ], { limit: 5 },
            function (err, keywords) {
              keywords.forEach(function (k) {
                result.push(k.word);
              });
              res.writeHead(200, {'Content-Type': 'text/plain'});
              res.end(result.join('\n'));
            });
        });

// Database
var KeywordSchema = new Schema({
  word: { type: String, required: true, index: { unique: true } }
});
module.exports.keywords = db.model('keywords', KeywordSchema);