URLSearchParams for query strings in Node.js - Cheat Sheet & Quick Revision

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beginner

What is URLSearchParams used for in Node.js?

URLSearchParams helps you work with query strings in URLs. It lets you easily read, add, or change parameters in the query part of a URL.

beginner

How do you create a URLSearchParams object from a query string?

You pass the query string (like 'name=John&age=30') to the URLSearchParams constructor, for example: new URLSearchParams('name=John&age=30').

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How can you get the value of a parameter named id from a URLSearchParams object?

Use the get method: params.get('id') returns the value of the id parameter or null if it doesn't exist.

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How do you add a new parameter page=2 to an existing URLSearchParams object?

Use the append method: params.append('page', '2'). This adds the parameter without removing existing ones.

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How do you convert a URLSearchParams object back to a query string?

Use the toString() method: params.toString() returns the query string like 'name=John&age=30'.

Which method gets the value of a query parameter from a URLSearchParams object?

A get()

B set()

C append()

D delete()

The get() method returns the value of a specific query parameter.

How do you create a URLSearchParams object from the string 'color=blue&size=medium'?

A URLSearchParams.parse('color=blue&size=medium')

B new URLSearchParams('color=blue&size=medium')

C URLSearchParams.create('color=blue&size=medium')

D new URLSearchParams({color:'blue', size:'medium'})

The constructor takes a query string directly as a string argument.

What does params.append('key', 'value') do?

A Adds a new parameter without removing existing ones

B Replaces the value of an existing parameter

C Deletes the parameter named 'key'

D Returns the value of 'key'

append() adds a new parameter even if one with the same name exists.

Which method removes a parameter from URLSearchParams?

A remove()

B clear()

C pop()

D delete()

delete() removes a parameter by name.

How do you get the full query string from a URLSearchParams object?

A valueOf()

B toJSON()

C toString()

D stringify()

toString() returns the query string representation.

Explain how to create, read, and add parameters using URLSearchParams in Node.js.

Think about how you handle a list of key-value pairs in a URL.

Describe how URLSearchParams helps manage query strings compared to manual string manipulation.

Consider the challenges of editing URL query strings by hand.