Parsing query strings in Node.js - Mini Project: Build & Apply

Parsing query strings

📖 Scenario: You are building a simple Node.js server that needs to read information from the URL query string. This is common when users send data through the URL, like searching or filtering.

🎯 Goal: Learn how to parse query strings in Node.js using the built-in URLSearchParams class to extract key-value pairs from a URL.

📋 What You'll Learn

Create a string variable with a URL containing a query string

Create a URLSearchParams object from the query string

Extract specific query parameters using get method

Convert a parameter value to a number

💡 Why This Matters

🌍 Real World

Parsing query strings is essential for web servers and APIs to read user input sent via URLs, such as search terms or filters.

💼 Career

Backend developers often parse query strings to handle requests and provide dynamic responses based on user input.

1

Create a URL string with query parameters

Create a string variable called url and set it to the exact value 'https://example.com/search?term=nodejs&limit=10'.

Node.js

# Create a string variable called url with the exact URL
# Your code here

Need a hint?

Use const url = 'https://example.com/search?term=nodejs&limit=10'; exactly.

2

Create a URLSearchParams object from the query string

Create a variable called params and set it to a new URLSearchParams object using the query string part of url. Use url.split('?')[1] to get the query string.

Node.js

const url = 'https://example.com/search?term=nodejs&limit=10';
# Create a URLSearchParams object called params from the query string
# Your code here

Need a hint?

Use new URLSearchParams(url.split('?')[1]) to get the query parameters.

3

Extract query parameters using get method

Create two variables: term and limit. Set term to params.get('term') and limit to params.get('limit').

Node.js

const url = 'https://example.com/search?term=nodejs&limit=10';
const params = new URLSearchParams(url.split('?')[1]);
# Extract term and limit from params
# Your code here

Need a hint?

Use params.get('term') and params.get('limit') to get values.

4

Convert limit to a number

Create a variable called limitNumber and set it to the number conversion of limit using Number(limit).

Node.js

const url = 'https://example.com/search?term=nodejs&limit=10';
const params = new URLSearchParams(url.split('?')[1]);
const term = params.get('term');
const limit = params.get('limit');
# Convert limit to a number and store in limitNumber
# Your code here

Need a hint?

Use Number(limit) to convert the string to a number.