How to get `GET` variables in Express.js on Node.js?

In Express.js, you can access GET (query string) variables using the req.query object. The req.query object contains key-value pairs of the query string parameters in a GET request. Here's an example:

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

// Define a route with a query string parameter
app.get('/example', (req, res) => {
  // Access query string variables using req.query
  const param1 = req.query.param1;
  const param2 = req.query.param2;

  // Do something with the parameters
  res.send(`Received parameters: param1=${param1}, param2=${param2}`);
});

// Start the server
const port = 3000;
app.listen(port, () => {
  console.log(`Server is listening on port ${port}`);
});

In this example:

• The route /example is defined to handle GET requests.
• Inside the route handler function, req.query is used to access the query string parameters.
• param1 and param2 represent the names of the query string parameters. You should replace them with the actual parameter names you expect in your application.

When a request is made to a URL like http://localhost:3000/example?param1=value1&param2=value2, the values of param1 and param2 will be accessible in the route handler through req.query.

For a more dynamic approach, you can also destructure the properties directly from req.query:

app.get('/example', (req, res) => {
  const { param1, param2 } = req.query;

  res.send(`Received parameters: param1=${param1}, param2=${param2}`);
});

This way, you directly extract the properties you need from req.query into variables.

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