JSON Formatter.
Paste JSON. Get clean, indented JSON or a minified single-line version.
Input JSON
Output
Everything happens in your browser
Local processing
Conversions happen in your browser. Nothing is uploaded.
Instant results
Native browser APIs mean no server queue, no waiting room.
No account needed
Open, drop, convert. No sign-up, no email, no friction.
Frequently asked questions
What does the validator catch?
Any JSON syntax error: missing commas, unbalanced braces, unquoted keys, trailing commas, single quotes instead of doubles. You'll see the exact parser error message inline.
Is my input sent anywhere?
No. JSON parsing runs entirely in your browser via the native JSON object. Nothing is uploaded — paste sensitive payloads with confidence.
What's the size limit?
Practical limit is your browser's memory. JSON files up to a few hundred MB work, though rendering large outputs in the textarea may be slow.
Are my files really not uploaded?
Correct. Every conversion in this tool runs in your browser using JavaScript and the local file APIs. There is no server-side processing, no file upload, no temporary storage, and no log of what you converted. You can verify this by opening your browser's network tab while converting — the only traffic is loading the page itself.
Do I need an account or to install anything?
No. Open the page, drop your file, download the result. No signup, no email, no extension, no app.
Is there a file-size limit?
Not from us. The practical limit is your device's memory — browser tabs typically handle files in the hundreds of megabytes range without issues. Very large files may take longer to process on phones than on laptops.