Params in Express

Express requests have a `params` object that contains route parameters, as well as a `query` object that contains query parameters. Here's what you need to know.

In Express, route parameters are values derived from portions of the URL that start with :. The the req.params property is where Express stores the values of the named sections in the URL.

const app = require('express')();

// `:userId` is a route parameter. Express will capture whatever
// string comes after `/user/` in the URL and store it in
// `req.params.userId`
app.get('/user/:userId', (req, res) => {
  req.params; // { userId: '42' }
  res.json(req.params);
});

const server = await app.listen(3000);
// Demo of making a request to the server
const axios = require('axios');
const res = await axios.get('http://localhost:3000/user/42');

res.data; // { userId: '42' }

Route parameters are also known as URL parameters.

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