All tools
JSON Formatter
Format, validate and minify JSON — pretty-print it or collapse it to one line.
Parsed and formatted in your browser — nothing is uploaded.
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JSON Formatter — frequently asked questions
Is my JSON sent to a server?+
No. It's parsed and formatted entirely in your browser with JSON.parse.
It says invalid JSON — why?+
The message shows where parsing failed. Common causes: trailing commas, single quotes, or unquoted keys — none of which are valid JSON.
Can it handle large files?+
Yes, within your browser's memory. Very large files may be slow to render.
你們會把我的檔案上傳到伺服器嗎？+
不會——這裡的每個工具都完全在你的裝置上處理檔案，不會向伺服器上傳任何內容。唯一的例外是 AI 工具，它們會把擷取的文字（而非檔案本身）傳送給 Claude 來完成工作。
有檔案大小限制嗎？+
我們沒有人為設下限制，但由於處理過程在你的瀏覽器中進行，非常大的檔案（超過 500MB 或 1000 頁）會受你裝置記憶體的限制，而非我們的限制。
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