Is my data sent to a server?

No. All processing happens in your browser. Your JSON never leaves your device.

What's the maximum JSON size?

There's no hard limit, but very large files (>10MB) may slow down your browser.

Is my data sent to a server?

No. All processing happens in your browser. Your JSON never leaves your device.

What's the maximum JSON size?

There's no hard limit, but very large files (>10MB) may slow down your browser.

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JSONフォーマッター＆バリデーター

シンタックスハイライトと構造分析でJSONをフォーマット、ミニファイ、バリデート。

100%無料登録不要ブラウザで実行

インデント：

入力

出力

出力がここに表示されます...

JSON Formatter & Validatorについて

Paste JSON to format with custom indentation, minify for production, or validate structure. Shows key counts, nesting depth, and data type breakdown. Works entirely in your browser.

よくある質問

Developerツールをもっと見る

JWT Decoder

Decode and inspect JWT tokens in your browser.

Paste a JWT token to instantly decode and inspect its header, payload, and signature. View claims like expiration, issuer, and custom data. Everything runs in your browser — tokens are never sent to a server.

Regex Tester

Test regular expressions with live highlighting.

Base64 Encoder / Decoder

Encode and decode Base64 strings online.

すべてのツールを見る

LaunchChatはウィジェットカスタマイズのためにJSON設定を処理しています。

クレジットカード不要

Clean JSON, clean docs. Clean support starts with an AI that reads your documentation and gives cited answers.

Free tier available. No credit card required.

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