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Workbench

JSON Formatter & Beautifier

Paste or upload JSON and get clean, readable output instantly. Choose your indentation, line endings, and whether to sort keys. All formatting happens locally in your browser, so even sensitive documents stay private.

Processed locally in your browser
Inputjson
Loading editor…
JSON○ Not checked0 lines0 chars0 B

How to use the json formatter

  1. Paste your JSON into the input editor, or use Upload / drag-and-drop to load a .json file.
  2. Pick an indentation style (2 spaces, 4 spaces, or tabs) and set line-ending and final-newline preferences.
  3. Press Format (or Ctrl/Cmd + Enter). The beautified result appears on the right.
  4. Copy or download the output. Invalid JSON is reported with an exact line and column — nothing is auto-repaired.

Example: Beautifying minified JSON

Input
{"name":"Ada","langs":["json","yaml"],"active":true}
Output
{
  "name": "Ada",
  "langs": ["json", "yaml"],
  "active": true
}

Key order is preserved. Enable “Sort keys” only if you explicitly want alphabetical order.

Frequently asked questions

Is my JSON uploaded to a server?
No. Formatting runs entirely in your browser using JavaScript and a Web Worker for large files. Your document never leaves your device.
Will the formatter change my numbers?
The output uses native JSON serialization. Integers beyond JavaScript’s safe range (2^53) can lose precision, so the tool warns you when that is possible instead of failing silently.
Can it fix invalid JSON automatically?
No. The formatter never silently repairs input. It reports the exact location of the first error so you can fix it deliberately.
What indentation options are supported?
Two spaces, four spaces, and tabs. You can also choose LF or CRLF line endings and whether to add a final newline.