This tool is useful when working with JSON data. It allows you to escape special characters in a string to make it valid JSON, or unescape a JSON string to retrieve the original content. Escaping is necessary when you have a string that contains characters like quotes, backslashes, or control characters that need to be properly encoded in JSON format. Unescaping, on the other hand, is helpful when you have a JSON-escaped string and want to recover the original string with the special characters intact.