- Can this compare deeply nested JSON objects?
- Yes — arbitrary depth. The tool recursively walks both structures by key path, so even objects nested 20+ levels deep are compared correctly. Each changed key gets a dotted path like `data.users[2].profile.settings.theme` so you can locate it instantly.
- Is this useful for API response validation?
- Yes — extremely. Diff expected vs actual responses in integration tests, compare prod vs staging payloads when debugging regressions, audit webhook payload changes when a provider updates their schema. The path summary format pastes cleanly into bug reports.
- Why do equivalent objects sometimes look different?
- Most common causes: (1) key ordering — enable 'sort keys' to normalize. (2) Type mismatch like '1' (string) vs 1 (number). (3) null vs missing key vs empty string — all three are semantically distinct in JSON. (4) Trailing whitespace inside string values. (5) Unicode normalization — combining characters vs precomposed.
- Can I export the diff as a patch file?
- Yes. Download as JSON Patch (RFC 6902) — a standard format describing add/remove/replace/move operations. Apply it programmatically using any JSON Patch library (fast-json-patch in Node, jsonpatch in Python, json-patch in Go). Useful for replaying changes, change-tracking, and undo systems.
- Does this replace schema validation?
- No — it complements it. Schema validation (with JSON Schema, Zod, Joi, OpenAPI) checks STRUCTURE — does the object match the expected shape? JSON diff checks VALUES — what specifically differs between two instances. Use schema for contract enforcement, diff for change detection and debugging.
- Is there a size limit for the JSON I can diff?
- No hard limit — the tool processes whatever you paste. Performance scales with size: small (under 1MB) diffs are instant; 10MB+ payloads may take a few seconds. Everything runs client-side so memory is your browser's only constraint. No server upload means no network bottleneck.
- Will this detect array reordering?
- By default, arrays are compared by index — so `[1,2,3]` vs `[3,2,1]` shows three changes. Switch to 'match by key' mode if your array elements have IDs (e.g., user objects with `id` field) and the tool will match them correctly regardless of order. For arrays of primitives (numbers, strings), index-based comparison is the only option.
- Is my JSON data private?
- Yes — completely. All parsing and diffing happens in your browser using JavaScript. Your JSON is never sent to any server, never logged, never stored. Safe for confidential API responses, PII, credentials, and proprietary data. You can verify by opening DevTools → Network tab while diffing — zero outgoing requests.
