diff --git a/lib/cartodb/server_options.js b/lib/cartodb/server_options.js
index 8c50a0d1..e77a544b 100644
--- a/lib/cartodb/server_options.js
+++ b/lib/cartodb/server_options.js
@@ -196,7 +196,7 @@ module.exports = function(redisPool) {
 
           // strip out windshaft/mapnik inserted sql if present
           var sql = req.params.sql.match(/^\((.*)\)\sas\scdbq$/);
-          sql = (sql != null) ? sql[1] : req.params.sql;
+          sql = (sql !== null) ? sql[1] : req.params.sql;
 
           return sql;
         },
@@ -596,7 +596,7 @@ module.exports = function(redisPool) {
           if ( tksplit.length > 1 ) {
             req.params.signer = tksplit.shift();
             if ( ! req.params.signer ) req.params.signer = user;
-            else if ( req.params.signer != user ) {
+            else if ( req.params.signer !== user ) {
               var err = new Error('Cannot use map signature of user "' + req.params.signer + '" on database of user "' + user + '"');
               err.http_status = 403;
               callback(err);
diff --git a/lib/cartodb/sql/sql_api.js b/lib/cartodb/sql/sql_api.js
index d5f742f9..32885e57 100644
--- a/lib/cartodb/sql/sql_api.js
+++ b/lib/cartodb/sql/sql_api.js
@@ -16,7 +16,7 @@ module.exports.query = function (username, api_key, sql, callback) {
     var qs  = { q: sql };
 
     // add api_key if given
-    if (_.isString(api_key) && api_key != '') { qs.api_key = api_key; }
+    if (_.isString(api_key) && api_key !== '') { qs.api_key = api_key; }
 
     // call sql api
     //