JSON.stringify() & Formatting

JSON.stringify() converts JavaScript objects to JSON strings. It's the opposite of JSON.parse().

Basic Usage

Pretty Printing

Use the third parameter to format output:

The Replacer Function

Filter or transform values during stringification:

Handling Special Values

Exercise: Format JSON

Exercise: Filter Properties

Key Points

• JSON.stringify() converts objects to JSON strings
• Use third parameter for pretty printing
• Replacer can filter or transform values
• undefined, functions, and symbols are omitted
• NaN and Infinity become null