JSON.parse() Basics

JSON.parse() converts a JSON string into a JavaScript object. It's essential when working with API responses or stored data.

Basic Usage

Parsing Different Types

The Reviver Function

JSON.parse() accepts an optional reviver function to transform values:

Exercise: Parse JSON String

Exercise: Parse Array

When to Use JSON.parse()

• Receiving data from an API (fetch response)
• Reading from localStorage
• Processing file contents
• Handling WebSocket messages

Key Points

• JSON.parse() converts strings to JavaScript values
• Works with objects, arrays, primitives
• Invalid JSON throws a SyntaxError
• Reviver function allows custom transformations