expressjsHow do I use query params with Express.js?

Query params are a way to pass data from a client to a server. With Express.js, you can access query params using the req.query object. Here is an example of how to use query params with Express.js:

// server.js
const express = require('express');
const app = express();

app.get('/', (req, res) => {
  const name = req.query.name;
  res.send(`Hello ${name}`);
});

app.listen(3000);

If we make a request to http://localhost:3000/?name=John, the output would be Hello John.

Code explanation

1. const express = require('express'); - This line imports the Express.js library.
2. const app = express(); - This line creates an Express.js app.
3. app.get('/', (req, res) => { - This line creates a GET route for the root path.
4. const name = req.query.name; - This line accesses the query param name from the req.query object.
5. res.send(Hello ${name}); - This line sends a response with the value of the name query param.
6. app.listen(3000); - This line starts the Express.js server on port 3000.

Helpful links

• Express.js Query Params
• Express.js Routing

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