JavaScript Data Exchange

JSON

JavaScript Object Notation - Data interchange format

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What is JSON?

JSON (JavaScript Object Notation) is a text format for storing and exchanging data. It's lightweight, easy to read, and works everywhere - APIs, config files, databases, and more!

Language Independent

Despite the name, JSON works with all programming languages - JavaScript, Python, Java, PHP, Ruby, etc.

🎓Understanding JSON

📝

Just Text

JSON is a text format that looks like JavaScript objects but is actually a string!

🌍

Universal

Works with all languages - Python, Java, PHP, Ruby, etc. Not just JavaScript!

📦

Data Transfer

Perfect for APIs, config files, saving data, and exchanging info!

Two Main Operations

📥

JSON.parse()

Convert JSON string → JavaScript object

JSON.parse('{"name":"Ali"}')

📤

JSON.stringify()

Convert JavaScript object → JSON string

JSON.stringify({name:"Ali"})

JSON Rules (Strict!)

✅ Must Use:

• Double quotes for strings

• Keys must be strings

• No trailing commas

• No comments allowed

❌ Cannot Use:

• Single quotes (JSON.parse fails)

• Functions or undefined

• Date objects directly

• Comments or extra commas

Valid JSON Data Types

• string

• number

• boolean

• null

• object

• array

JSON Syntax

Valid JSON format

javascript

code

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Console Output

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JSON.parse() - String to Object

Convert JSON string to JavaScript object

javascript

code

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Console Output

Click "Run Code" to see output here...

JSON.stringify() - Object to String

Convert JavaScript object to JSON string

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Common Use Cases

Where JSON is used

javascript

code

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Console Output

Click "Run Code" to see output here...

Valid JSON Data Types

What can be stored in JSON

✅ Allowed

• String: "hello"
• Number: 42, 3.14
• Boolean: true, false
• Null: null
• Object: {"key": "value"}
• Array: ["a", "b", "c"]

❌ Not Allowed

• Functions
• undefined
• Date objects (convert to string)
• Symbol
• Regular expressions
• Comments

Error Handling

Handle invalid JSON gracefully

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Key Takeaways

Text Format

JSON is a string - not a JavaScript object

Two Methods

parse() → object, stringify() → string

🌍

Universal

Works with all programming languages

📡

APIs

Standard format for web APIs and data exchange

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Parsing JSON strings into objects.

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JavaScript Data Exchange

JSON

JavaScript Object Notation - Data interchange format

Find videos you like?

Save to resource drawer for future reference!

What is JSON?

JSON (JavaScript Object Notation) is a text format for storing and exchanging data. It's lightweight, easy to read, and works everywhere - APIs, config files, databases, and more!

Language Independent

Despite the name, JSON works with all programming languages - JavaScript, Python, Java, PHP, Ruby, etc.

🎓Understanding JSON

📝

Just Text

JSON is a text format that looks like JavaScript objects but is actually a string!

🌍

Universal

Works with all languages - Python, Java, PHP, Ruby, etc. Not just JavaScript!

📦

Data Transfer

Perfect for APIs, config files, saving data, and exchanging info!

Two Main Operations

📥

JSON.parse()

Convert JSON string → JavaScript object

JSON.parse('{"name":"Ali"}')

📤

JSON.stringify()

Convert JavaScript object → JSON string

JSON.stringify({name:"Ali"})

JSON Rules (Strict!)

✅ Must Use:

• Double quotes for strings

• Keys must be strings

• No trailing commas

• No comments allowed

❌ Cannot Use:

• Single quotes (JSON.parse fails)

• Functions or undefined

• Date objects directly

• Comments or extra commas

Valid JSON Data Types

• string

• number

• boolean

• null

• object

• array

JSON Syntax

Valid JSON format

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

JSON.parse() - String to Object

Convert JSON string to JavaScript object

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

JSON.stringify() - Object to String

Convert JavaScript object to JSON string

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Common Use Cases

Where JSON is used

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Valid JSON Data Types

What can be stored in JSON

✅ Allowed

• String: "hello"
• Number: 42, 3.14
• Boolean: true, false
• Null: null
• Object: {"key": "value"}
• Array: ["a", "b", "c"]

❌ Not Allowed

• Functions
• undefined
• Date objects (convert to string)
• Symbol
• Regular expressions
• Comments

Error Handling

Handle invalid JSON gracefully

javascript

code

DarkEditable

Console Output

Click "Run Code" to see output here...

Key Takeaways

Text Format

JSON is a string - not a JavaScript object

Two Methods

parse() → object, stringify() → string

🌍

Universal

Works with all programming languages

📡

APIs

Standard format for web APIs and data exchange

Coder Pod - Learn Programming Online | AI Coding Tutor & Interview Practice

Random Numbers

JSON.parse

JavaScript Code Editor

Building Your Learning Module...

JSON

What is JSON?

Language Independent

Just Text

Universal

Data Transfer

Two Main Operations

JSON.parse()

JSON.stringify()

JSON Rules (Strict!)

Valid JSON Data Types

JSON Syntax

JSON.parse() - String to Object

JSON.stringify() - Object to String

Common Use Cases

✅ Allowed

❌ Not Allowed

Error Handling

Key Takeaways

Text Format

Two Methods

Universal

APIs

Random Numbers

JSON.parse

JavaScript Code Editor

JSON

What is JSON?

Language Independent

Just Text

Universal

Data Transfer

Two Main Operations

JSON.parse()

JSON.stringify()

JSON Rules (Strict!)

Valid JSON Data Types

JSON Syntax

JSON.parse() - String to Object

JSON.stringify() - Object to String

Common Use Cases

✅ Allowed

❌ Not Allowed

Error Handling

Key Takeaways

Text Format

Two Methods

Universal

APIs