codex-lv2-may-2025

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Lesson: Introduction to Settings Files and JSON

🎯 Objective

Learn what settings files are, understand JSON format, and master the basic syntax rules for creating configuration files.

📌 What Are Settings Files?

A settings file is a special file that controls how a program behaves. Many tools like VSCode, web servers, and apps use configuration files to let users customize behavior without changing the program itself.

In VSCode, the settings file is written in a format called JSON.

🗂️ What is JSON?

JSON stands for JavaScript Object Notation. It’s a structured way to store data as key-value pairs.

Example JSON:

{
    "catName": "Ginger",
    "age": 1,
    "isAdopted": true,
    "weight": 4
}

✅ Understanding Each Value

"projectName": "My App" → String: use double quotes.
"version": 1 → Number: do not use quotes.
"isPublic": true → Boolean: do not use quotes.
"maxUsers": 100 → Number: do not use quotes.

✅ General JSON Rules

Keys: always in double quotes.
Strings: use double quotes.
Numbers and booleans: do not use quotes.
Separate each pair with a comma, but no comma after the last item.

✅ Summary

JSON is strict about quotes:
- Keys → quotes required.
- Strings → quotes required.
- Numbers → no quotes.
- Booleans (true/false) → no quotes.

After you read this page, move on to the next lesson.

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