What is JSON Diff?
JSON diff is the process of comparing two JSON documents to identify what has been added, removed, or changed between them. Unlike a plain text diff that compares line by line, a JSON diff can be semantic: it understands that two JSON objects are the same if they have the same keys and values, even when property order or formatting differs. JSDiff provides both semantic JSON comparison and traditional text-based diff modes.
Why JSON Diff Matters
When you work with APIs, config files, or any structured data, you often need to see exactly what changed between two versions. A line-based diff can show many false differences if formatting or key order changed. A semantic JSON diff focuses on actual data changes, which is essential for API debugging, config comparison, and code review.
How to Compare JSON with JSDiff
On JSDiff, select the JSON mode, paste your original JSON in the left panel and the modified JSON in the right panel. The tool highlights additions in green and removals in red, and supports structured display for nested objects. All processing happens locally in your browser for privacy. For a step-by-step guide, see How to Use JSDiff.
Related Terms
- Semantic Diff – comparison that respects meaning, not just text
- Myers Algorithm – the algorithm behind efficient sequence comparison
- Glossary index