handlers.js

var csv = require("dsv")(",");

module.exports = {
  google: function(body) {

    var response = JSON.parse(body);

    //Success, return a lat/lng object
    if (response.results && response.results.length) {
      return response.results[0].geometry.location;
    }

    //No match, return a string
    if (response.status === "ZERO_RESULTS" || response.status === "OK") {
      return "NO MATCH";
    }

    //Other error, return a string
    return response.status + (response.error_message && response.error_message.length ? ": " + response.error_message : "");

  },
  mapbox: function(body) {

    var response = JSON.parse(body);

    if (response.features === undefined) {
      return response.message;
    } else if (!response.features.length) {
      return "NO MATCH";
    }

    return {
      lat: response.features[0].center[1],
      lng: response.features[0].center[0]
    };

  },
  mapzen: function(body) {

    var response = JSON.parse(body);

    if (response.features === undefined) {
      return response.message;
    } else if (!response.features.length) {
      return "NO MATCH";
    }

    return {
      lat: response.features[0].geometry.coordinates[1],
      lng: response.features[0].geometry.coordinates[0]
    };

  },
  tamu: function(body) {

    var parsed;

    if (!body.length) {
      return "NO RESPONSE BODY RETURNED, CHECK YOUR API KEY";
    }

    try {
      parsed = csv.parseRows(body);
    } catch(e) {
      return "ERROR PARSING RESPONSE: "+body;
    }

    if (parsed[0].length < 5) {
      return "UNEXPECTED RESPONSE FORMAT FROM TAMU GEOCODER: "+csv.formatRows([parsed[0]]);
    }

    if (!parsed.length || +parsed[0][2] !== 200 || !+parsed[0][3] || !+parsed[0][4]) {
      return "NO MATCH";
    }

    return {
      lat: parsed[0][3],
      lng: parsed[0][4]
    }

  },
  osm: function(body) {

    var parsed;

    if (!body.length) {
      return "NO RESPONSE BODY RETURNED, CHECK YOUR API KEY";
    }

    try {
      parsed = JSON.parse(body);
    } catch(e) {
      return "ERROR PARSING RESPONSE: "+body;
    }

    if (!Array.isArray(parsed)) {
      return "UNEXPECTED RESPONSE: "+body;
    }

    if (!parsed.length) {
      return "NO MATCH";
    }

    return {
      lat: parsed[0].lat,
      lng: parsed[0].lon
    };

  }
};