Node2Know — Express Load & Send JSON

A minimal Express app that reads a JSON file from disk and returns it from an API route.

This demo introduces:

• fs.readFile(...) (callback-style)
• path.join(...) for safe file paths
• res.json(...) to return JSON to the client

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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

Home page:

• http://localhost:3000/

API route:

• http://localhost:3000/api/inventory

You should receive JSON loaded from:

• data/inventory.json

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👀 Watch mode

npm run watch

Edit data/inventory.json, refresh the /api/inventory route, and you’ll see the updated response.

Stop with:

• Ctrl + C

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🧠 What the route does

1. Build a file path:

const filePath = path.join(__dirname, "data", "inventory.json");

2. Read it:

fs.readFile(filePath, "utf8", (err, data) => { ... });

3. Parse + return:

const inventory = JSON.parse(data);
res.json(inventory);

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📁 Project Structure

.
├── app.js
├── package.json
└── data/
    └── inventory.json

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Repo

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

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License

Node2Know-LEARN-1.0