Node2Know — Express Query Strings

A minimal Express app demonstrating query strings with req.query.

Query strings are the “options panel” for a route:

• they don’t change the route path
• they modify the request using key/value pairs after ?

Example:

/search?keyword=turbo&sort=desc

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✅ Prereqs

• Node.js
• npm

Check:

node -v
npm -v

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📦 Install

npm install

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▶️ Run

npm start

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🧪 Try it

With keyword + sort

Open:

• http://localhost:3000/search?keyword=turbo&sort=desc

You’ll get:

Searching for turbo sorted by desc

With keyword only

Open:

• http://localhost:3000/search?keyword=turbo

You’ll get:

Searching for turbo sorted by undefined

(That’s intentional — it shows sort is optional unless you enforce it.)

Missing keyword

Open:

• http://localhost:3000/search

You’ll get:

Please specify a keyword.

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👀 Watch mode

npm run watch

Edit app.js, save, refresh.

Stop with:

• Ctrl + C

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🧠 Key idea

Query string values land here:

req.query

So:

• /search?keyword=turbo&sort=desc
• req.query = { keyword: "turbo", sort: "desc" }

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📁 Project Structure

.
├── app.js
├── package.json
└── README.md

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Repo

• https://github.com/ProfessorSolo/Node2Know-ExpressQueryStrings.git

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License

Node2Know-LEARN-1.0