Turn a one-line response into something you can inspect
Useful when you need to confirm fields, nested objects, arrays, and unexpected values quickly.
Readable structure is usually the fastest way to spot field-level mistakes in API data.
Paste JSON to beautify, minify, validate, escape, or unescape it instantly. Everything runs locally in your browser.
JSON の整形を開始
左側に JSON を入力するか、インポートでファイルから読み込んでください。
A reliable formatter workflow is simple: paste the raw payload, choose whether you need readable or compact output, review parse errors if any, then copy, download, or continue into repair, table editing, or schema generation.
From one-line payload to readable structure
A lot of real payloads come from logs, APIs, and queues as a single unreadable line. The formatter turns that into something you can inspect in seconds.
Use pretty output for review and debugging. Switch to minified output only when you need compact transport or storage.
These are the common cases where formatting pays off immediately during real development work.
Useful when you need to confirm fields, nested objects, arrays, and unexpected values quickly.
Readable structure is usually the fastest way to spot field-level mistakes in API data.
Stable key order makes diffs cleaner and reduces noise when reviewing configuration changes.
Sorting is useful when your real goal is comparison rather than human-friendly business ordering.
Logs and message systems often store JSON inside strings. Unescape it first, then keep working on the actual structure.
If the payload is full of backslashes, unescaping is usually the first useful step.
Tutorial Step
ステップ 1 – JSON をオンライン整形ツールに貼り付ける/インポートする
Start with the original payload. You do not need to clean up spacing or line breaks first.
Tutorial Step
ステップ 2 – 整形オプションを選ぶ
Readable JSON and compact JSON solve different problems. Pick the mode that matches what you need next.
Tutorial Step
ステップ 3 – 整形結果とエラーを確認する
The output area is both a result view and a fast feedback loop. Valid JSON renders immediately; invalid JSON shows an actionable error.
Tutorial Step
ステップ 4 – API/レスポンス/ログ向けにコピーまたはダウンロードする
Once the JSON is clean, use it as the working copy for the next step instead of repeating the cleanup elsewhere.
A common formatter workflow
Paste the raw payload into the formatter and expand it into readable JSON first.
If the parser fails, jump to the error or move the payload into Repair.
Once the structure is valid, choose beautified, minified, escaped, or unescaped output based on the next task.
Apply the output back to input if the cleaned result should become your new working copy.
Continue into the table editor, compare tool, or schema generator when formatting is no longer the bottleneck.
Putting the formatter at the front of the workflow usually saves time later because every downstream tool receives cleaner JSON.
初心者向けクイックヒント
JSON の構文を確認し、整形や API 送信の前にエラーを素早く特定します。
引用符の不足、末尾カンマ、括弧の不一致など、一般的な JSON の問題を自動で修復します。
Convert clean JSON into a spreadsheet with nested-field flattening and live preview.
Compare two JSON payloads side by side and highlight additions, deletions, and edits.
JSON データを表計算ソフトのようなインターフェースで視覚的に編集でき、リアルタイムで更新されます。
検証とドキュメント化のために、JSON から JSON Schema 定義を生成します。
JSON を整形すると、適切なインデント、改行、空白が付与され、読みやすく理解しやすくなります。
はい。2 スペース、4 スペース、またはコンパクト(ミニファイ)を選べます。
いいえ。表示形式が変わるだけで、構造と値はそのままです。
はい。大きな JSON でも効率的に処理できますが、非常に大きい場合は少し時間がかかることがあります。
Formatting focuses on readability, while validation focuses on syntax correctness. This page does both in one flow.
No. Formatting, validation, escaping, and unescaping all run locally in your browser.