Developer Tools
JSON Formatter — No Upload, No Tracking, Instant
Format and validate JSON instantly in your browser. Paste your JSON, choose 2- or 4-space indentation, and get clean, pretty-printed output with syntax highlighting. Your data never leaves your device — no upload to any service, no logs, no tracking.
- Paste your JSON into the input area.
- Choose 2- or 4-space indentation.
- Copy the formatted output.
Frequently Asked Questions
- Is my JSON data sent to a server?
- No. All formatting runs in your browser. Nothing is sent anywhere.
- Why is my JSON invalid?
- Common issues: unquoted keys, trailing commas, single quotes instead of double quotes. JSON requires double-quoted string keys.
- Can it handle large JSON files?
- Yes, limited only by your browser's memory. Files up to a few MB format instantly.
- Can I minify JSON too?
- Paste formatted JSON and set indent to 0 — or just use JSON.stringify directly.
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