Is it safe to paste sensitive data?

The tool runs fully in your browser and makes no network request, so your JSON never leaves your device.

Why does my JSON say it is invalid?

Common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. The error message shows the position.

Two spaces, which is the most common convention for JSON and JavaScript projects.

Pretty-print JSON with 2-space indentation, or minify it to a single line. Invalid JSON gets a clear error.

Your text

Result

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1
Paste your JSON
Add the JSON you want to clean up or check.
2
Format or minify
Choose Format for readable output, or Minify to strip whitespace.
3
Copy the result
Copy the formatted JSON with one click.

Invalid JSON is reported with the exact parser error.

Readable 2-space output, or the smallest possible single line.

Everything runs in your browser — API responses and payloads are never uploaded.

This tool runs entirely in your browser. Your JSON is never uploaded to a server and we never see it — safe for real API payloads.

Is it safe to paste sensitive data?: The tool runs fully in your browser and makes no network request, so your JSON never leaves your device.
Why does my JSON say it is invalid?: Common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. The error message shows the position.
What indentation does it use?: Two spaces, which is the most common convention for JSON and JavaScript projects.

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