JSON Quiz: Test Your Knowledge of JavaScript Object Notation

💡 Quick Study Guide: Understanding JSON

• 🌍 What is JSON? JSON stands for JavaScript Object Notation. It's a lightweight data-interchange format, easy for humans to read and write, and easy for machines to parse and generate.
• 🔄 Purpose: Primarily used for transmitting data between a server and web application, often as an alternative to XML.
• 📝 Data Types: JSON supports the following data types: strings (double quotes), numbers (integers or floats), booleans (true/false), null, objects (key/value pairs, curly braces `{}`), and arrays (ordered lists, square brackets `[]`).
• 🔑 Key-Value Pairs: Data is represented as key/value pairs. Keys must be strings enclosed in double quotes. Values can be any valid JSON data type. Example: `"name": "Alice"`.
• 🚫 Syntax Rules: Keys must be double-quoted strings. Values must be valid JSON data types. Object members are separated by commas. Arrays are comma-separated lists of values.
• ❌ Unsupported Data Types: JSON does NOT support functions, dates (must be represented as strings), or undefined.
• 🛠️ Parsing & Stringifying: In JavaScript, `JSON.parse()` converts a JSON string into a JavaScript object, and `JSON.stringify()` converts a JavaScript object into a JSON string.

🧠 Practice Quiz: Test Your JSON Skills!

1. Which of the following is NOT a valid JSON data type?

• A) String
• B) Number
• C) Function
• D) Boolean

2. In JSON, what must keys be enclosed in?

• A) Single quotes ('')
• B) Double quotes (" ")
• C) Backticks (``)
• D) No quotes

3. Which character is used to separate key/value pairs in a JSON object?

• A) Semicolon (;)
• B) Colon (:)
• C) Comma (,)
• D) Hyphen (-)

4. What is the primary purpose of JSON?

• A) Styling web pages
• B) Managing databases
• C) Transmitting data between a server and web application
• D) Executing client-side scripts

5. Which JavaScript method is used to convert a JSON string into a JavaScript object?

• A) `JSON.toObject()`
• B) `JSON.parse()`
• C) `JSON.convert()`
• D) `JSON.stringify()`

6. Is the following JSON valid? `{"name": "Alice", "age": 30, "city": 'New York'}`

• A) Yes, it is valid.
• B) No, because 'city' value uses single quotes.
• C) No, because 'age' should be a string.
• D) No, because there's no array.

7. Which of these correctly represents a JSON array of numbers?

• A) `(1, 2, 3)`
• B) `[1, 2, 3]`
• C) `{1, 2, 3}`
• D) `{"1", "2", "3"}`