Node search

search.js

//helper method for writing out json payloads
var json = function(res, data) {
  res.writeHead(200, { 'Content-Type': 'application/json; charset=utf-8' });

  if(typeof data === "string") res.write(data);

  else res.write(JSON.stringify(data));

  res.end();
};


/*
 * Routes
 */
// Index Page
app.get('/', function(request, response, next) {
  response.render('index');
});

// Search
app.get('/search', function (req, res, next) {
  var query = req.param('query');
  var lang = req.param('lang') || 'en';
  var tld = req.param('tld') || 'com';

  if (typeof query !== 'undefined') {
    Google(query, lang, tld, function(err, data) {
      json(res, data);
      // TODO expect JSON Array
    });
  } else {
    // should raise error if missing query params
    res.writeHead(400);

    var response = {
      status  : 400,
      success : 'Query missing'
    }

    res.end(JSON.stringify(response));
  }

});


/**
 * Expose a `Google` client.
 */

module.exports = Google;

function Google(query, options){
  google.resultsPerPage = 10;
  var nextCounter = 0;

  google(query, function(err, next, links){
    if (err) console.error(err);

    results = [];

    for (var i = 0; i < links.length; ++i) {
      results.push(
        {"title": links[i].title + ","
         "link": links[i].link) + ","
         "description": links[i].description
        });
      //console.log(links[i].title + ' - ' + links[i].link); //link.href is an alias for link.link
      //console.log(links[i].description + "\n");
    }

    if (nextCounter < 1) {
      nextCounter += 1;
      if (next) next();
    }

    return results
    // TODO results should return an array
  });
}

I see the problem in you Google function, https://gist.github.com/olimart/d6bb4491746c5684dfd8#file-search-js-L53.

It's signature, Google(query, options), but you are calling it, Google(query, lang, tld, function(err, data) which is wrong. Google function is wrong as well.

Here is the working version, based on express.js and google.

https://gist.github.com/alexbeletsky/a3ce02a05790e24a3176