Salesforce JavaScript Developer Practice Exam

What does JSON.parse do?

1. Convert JavaScript objects into JSON strings

2. Parse a JSON string and convert it to a JavaScript object

3. Validate JSON syntax only

4. Store JSON data across sessions

The correct answer is: Parse a JSON string and convert it to a JavaScript object

JSON.parse is a method used to convert a JSON string into a JavaScript object. When you have a string that follows the JSON format, calling JSON.parse on that string allows the JavaScript engine to interpret the data contained within it and construct the corresponding JavaScript object. This is crucial when working with data that is received as a JSON string, for example, from an API response or a JSON file, as it enables developers to manipulate and access the data using standard JavaScript object notation. This functionality is essential for the integration of web applications, as JSON is a common format for data exchange. By parsing the JSON string, developers can work with the data in a structured way, making it easier to access specific properties and values of the object. The other options do not accurately describe the purpose of JSON.parse. While converting JavaScript objects to JSON strings is handled by JSON.stringify, validating JSON syntax requires a different approach, as JSON.parse is capable of throwing an error if the string is not valid JSON. Finally, storing JSON data across sessions involves mechanisms like localStorage or sessionStorage, rather than a method for parsing JSON data.