Home JSON
JSON formatter
readyPaste JSON. Get formatted, minified, or validation errors instantly. Everything runs in your browser - no payload is ever sent anywhere.
[01] What this does
Three modes:
- Format - re-renders your JSON with 2-space indentation, sorted properties optional. Catches syntax errors as you type.
- Minify - strips whitespace, returns compact valid JSON. Useful for embedding in URLs or reducing payload size.
- Validate - happens automatically; the status pill above turns red on parse error and shows the column number where the parser choked.
[02] Privacy
Your JSON never leaves your browser. The formatter uses the standard JavaScript JSON.parse + JSON.stringify - both run locally. No network requests, no logging. Verify in your browser's network tab.
[03] FAQ
Why is my JSON failing to parse?
Most common: trailing commas (not allowed in strict JSON), single quotes (must be double), unquoted keys, or comments (also not allowed in JSON). The error message above shows the column number.
Can I paste very large JSON?
Yes - anything your browser can hold in memory. Tested up to ~50MB. Larger than that may cause UI lag while parsing.
Is this safe for confidential data?
All processing is client-side; no data is sent to a server. The input persists in your browser's localStorage between visits - clear it manually if you need to.
No signup. Tool input stays in your browser. All math runs locally in your browser.