A JSON Diff tool is a powerful utility for comparing two JSON objects and highlighting their differences. This is invaluable in many development scenarios, such as tracking changes in API responses over time, verifying the results of a data transformation, or comparing configuration files between different environments (e.g., development vs. production). Instead of manually scanning two large files, a diff tool programmatically analyzes both structures and provides a clear, concise report of what was added, removed, or modified. This not only saves a tremendous amount of time but also eliminates human error, ensuring that even the smallest, most subtle changes are caught. It's a critical tool for debugging, testing, and maintaining data consistency.