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

The method used to convert a JSON string into a JavaScript object is JSON.parse(). This function takes a string formatted as JSON and parses it, transforming it into a corresponding JavaScript object. This is essential for handling data that comes in JSON format, which is commonly used for data interchange between a server and a web application.

When using JSON.parse(), the string must be valid JSON; otherwise, it will throw an error. This method enables developers to easily work with structured data by converting it into a format that can be manipulated with standard JavaScript object operations. JSON.stringify(), on the other hand, is used for the opposite purpose—converting a JavaScript object back into a JSON string, which is useful for sending data to a server or for storage.

The other options, such as JSON.convert() and JSON.objectify(), do not exist in the JavaScript language and would result in errors if attempted. Therefore, JSON.parse() is clearly the correct and functional choice for this operation.