How to get query params in Express

In Express.js all the query parameters are stored in the object req.query, so you can access them in any of your route handlers or middleware functions.

So imagine your Express backend is running on https://learn.coderslang.com and your client tries to GET https://learn.coderslang.com?id=125&name=hero

const routeHandler = (req, res, next) => {
  console.log(req.query.id);      // 125
  console.log(req.query.name);    // hero
  console.log(req.query.surname); // undefined
  next();
}

In the example above I accessed the query string variables id and name and logged them to the screen. The parameter surname is undefined as it’s missing from the query string.