Create mostVotedMaps.js

route/mostVotedMaps.js

+const path = require('path'),
+    scriptName = path.basename(__filename).replace(/\.js$/i,'');
+
+/**
+ * @param {import('express').Express} app
+ * @param {import('mysql').Connection} sql
+ */
+module.exports = function(app, sql, token, errorHandler) {
+    app.get('/'+scriptName, function(req, res) {
+        sql.query('SELECT map, COUNT(*) AS votes FROM votes GROUP BY map ORDER BY votes DESC', (err, sqlRes)=>{
+            if (err) {
+                console.log(err);
+                errorHandler(res, 500, 'Internal server error');
+            } else {
+                let maps = {};
+                for (let i = 0; i < sqlRes.length; i++) {
+                    maps[sqlRes[i].map] = sqlRes[i].votes;
+                }
+                res.json(maps);
+            }
+        });
+    });
+};
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