How do I format JSON?

Paste your JSON into the input box and pick Pretty (2 or 4 spaces) or Minify. The result is shown immediately and can be copied with one click.

How do I pretty print JSON?

Click Pretty (2 spaces) or Pretty (4 spaces). The JSON is reformatted with consistent indentation, sorted nicely for human reading.

Why is my JSON invalid?

We point at the line and column of the first syntax error. The most common causes are trailing commas, single quotes instead of double, and missing closing brackets.

How do I find a JSON syntax error?

Paste the JSON and the error message will pinpoint the exact line and column of the problem, so you can jump straight to the fix.

Can I format large JSON files?

Yes — the limit is your device's memory. Files up to tens of MB format quickly on a modern laptop.

Is my JSON data stored?

No. Formatting runs entirely in your browser, so your data — even if it contains sensitive fields — never leaves your device.

Can I minify JSON too?

Yes. Click Minify to strip every space and newline, producing the smallest valid JSON for storage or transmission.

What's the difference between JSON formatting and validation?

Formatting changes how the JSON looks; validation checks whether it's syntactically correct. Both happen here at once — invalid JSON shows an error, valid JSON gets formatted.

Can I format JSON on mobile?

Yes. The tool works on phones and tablets.

Is this JSON formatter free?

Yes — free, no signup, no limits.

JSON Formatter

Pretty-print or minify JSON. Auto-detects, highlights syntax errors with line and column.

Quick answer: Pretty-print or minify JSON. Auto-detects, highlights syntax errors with line and column.

Last updated 2026-05-01

Frequently asked questions

How do I format JSON?: Paste your JSON into the input box and pick Pretty (2 or 4 spaces) or Minify. The result is shown immediately and can be copied with one click.
How do I pretty print JSON?: Click Pretty (2 spaces) or Pretty (4 spaces). The JSON is reformatted with consistent indentation, sorted nicely for human reading.
Why is my JSON invalid?: We point at the line and column of the first syntax error. The most common causes are trailing commas, single quotes instead of double, and missing closing brackets.
How do I find a JSON syntax error?: Paste the JSON and the error message will pinpoint the exact line and column of the problem, so you can jump straight to the fix.
Can I format large JSON files?: Yes — the limit is your device's memory. Files up to tens of MB format quickly on a modern laptop.
Is my JSON data stored?: No. Formatting runs entirely in your browser, so your data — even if it contains sensitive fields — never leaves your device.
Can I minify JSON too?: Yes. Click Minify to strip every space and newline, producing the smallest valid JSON for storage or transmission.
What's the difference between JSON formatting and validation?: Formatting changes how the JSON looks; validation checks whether it's syntactically correct. Both happen here at once — invalid JSON shows an error, valid JSON gets formatted.
Can I format JSON on mobile?: Yes. The tool works on phones and tablets.
Is this JSON formatter free?: Yes — free, no signup, no limits.