JSON Formatter

How it works

1. Paste your JSON.
2. Choose an indent style.
3. Click Format & validate.
4. Copy the formatted result, or see exactly what’s invalid.

Supported formats & limitations

• Input
  Any JSON text — objects, arrays, or primitives.
• Output
  Pretty-printed JSON with your chosen indentation, or a validation error.

• Only standard JSON is supported — JavaScript-only syntax like comments or trailing commas will be reported as invalid.
• Very large JSON documents may take a moment to format on lower-powered devices.

Frequently asked questions

Is my JSON data sent anywhere? ›

No, parsing and formatting both happen entirely in your browser.

What happens if my JSON is invalid? ›

You’ll see a specific error message describing what the parser found wrong, instead of a silent failure.

Can I minify JSON instead of formatting it? ›

Not currently — this tool focuses on making JSON readable, not compact.

Troubleshooting

Why does it say my JSON is invalid when it looks fine? ›

Common causes are trailing commas, single quotes instead of double quotes, or unquoted object keys — all valid in JavaScript but not in strict JSON.

Why is the output the same as my input? ›

If your JSON was already formatted with the same indentation you selected, the output can look identical — the content itself is still re-validated.

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