lower case all query params

app.js

@@ -5,14 +5,16 @@ const home = require("./routes/home");
 const v1 = require("./routes/v1");
 const assets = require("./routes/assets");
 const cors = require("./src/cors");
+const {queryParamsToLower} = require("./src/querySanitizers");
 
 const app = express();
 app.use(cors);
+app.use(queryParamsToLower);
 app.use("/", home);
 app.use("/service/v1", v1);
 app.use("/assets", assets);
 
-app.listen(port, err => {
+module.exports = app.listen(port, err => {
   if (err) {
     return console.log(err);
   }

src/querySanitizers.js

+
+const queryParamsToLower = (req, res, next) => {
+  for (let key in req.query) {
+    if ((key.toLowerCase() === key) == false) {
+      req.query[key.toLowerCase()] = req.query[key]
+      delete req.query[key]
+    }
+  }
+  next();
+}
+
+module.exports = { queryParamsToLower };
\ No newline at end of file