Question

How to pass request query parameters through a Node.js application?

Describe how to handle query parameters in a Node.js application. Mention using frameworks like Express to retrieve parameters from the request object (req.query) and pass them to functions, APIs, or databases as needed. Highlight structuring the URL to include key-value pairs for queries.

Answer 1

Using Node.js http Module

Step 1: Basic Server Using http Module

const http = require('http');

const url = require('url');

const server = http.createServer((req, res) => {

  // Parse the URL to get query parameters

  const parsedUrl = url.parse(req.url, true); // The `true` argument parses query string into an object

  const queryParameters = parsedUrl.query;

// Get query parameters

  const query = queryParameters.query;

  const page = queryParameters.page;

 // Set response headers

  res.writeHead(200, { 'Content-Type': 'application/json' });

 // Send a response

  res.end(JSON.stringify({

    message: `Searching for "${query}" on page ${page}`

  }));

});

server.listen(5000, () => {

  console.log('Running server on http://localhost:5000');

});

In this example:

A GET request to /search?query=nodejs&page=1 would also return a JSON response:

{  "message": "Searching for 'nodejs' on page 1"}