The querystring module is used to parse and stringify URL query strings.

const querystring = require('querystring');

// Parsing a query string
const parsedQuery = querystring.parse('name=Nodejs&age=10');
console.log(parsedQuery.name); // Output: Nodejs

// Stringifying an object into a query string
const stringifiedQuery = querystring.stringify({ name: 'Nodejs', age: 10 });
console.log(stringifiedQuery); // Output: name=Nodejs&age=10