JSON Diff は何をしますか？
JSON Diff はブラウザ上で入力を比較するツールで、結果と制限を明確に示します。 検証済みの機能： Structural JSON comparison, JSON path output, Array index comparison, Local parsing.
Choose structural JSON diff or text diff?
Use JSON Diff when value types, keys, and array positions matter but formatting does not. Use Text Diff when whitespace, comments in a non-JSON format, or exact source lines are part of the change.
使い方
- Paste valid JSON into Original JSON and Changed JSON, or load the sample pair.
- Choose Compare values and select Convert. Whitespace and property order do not create changes because both inputs are parsed first.
- Review each +, −, or ~ path, then copy or download the comparison.
実際の入出力例
A changed scalar and an appended array item
入力
Original: {"version":1,"tags":["local"]}
Changed: {"version":2,"tags":["local","fast"]}出力
~ $.version: 1 → 2
+ $.tags[1] = "fast"The comparison follows parsed object keys and array indexes, so indentation changes alone produce no result.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| The output is empty and the page reports a JSON parse error. | One input contains invalid JSON such as a trailing comma or an unquoted key. | Validate both documents first and correct the reported syntax before comparing them. |
| A reordered array produces several changes. | Array positions are significant; the tool does not match moved objects by an ID field. | Sort arrays by a stable key before comparing when order should not matter. |
Important behavior of JSON Diff
このツール固有の制限： Array order remains significant, so moved items appear as changes.
標準と実装の参考資料
- RFC 8259 — The JavaScript Object Notation (JSON) Data Interchange Format (opens in a new tab)Defines the JSON grammar accepted before values are compared.
JSON Diff — FAQ
Does the JSON Diff upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the JSON Diff accept?
It accepts two valid JSON documents. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the JSON Diff produce?
It produces path-based additions, removals, and changed values. Copy and download controls appear when the output format supports them.
What limitation should I know?
Array order remains significant, so moved items appear as changes.
更新内容
実質的な更新： JSON Diff: Added Structural JSON comparison, JSON path output, Array index comparison, Local parsing, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.