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JSON Formatter & Validator

Format, validate, and beautify JSON instantly in your browser. 100% private — your data never leaves your device.

100% private

{ }

Formatter

JSON Formatter

Live demo
Messy JSONValid JSON
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Input JSON
Formatted output

Auto-playing walkthrough — paste input, click format now, see the result

Result appears here after processing…

How to use JSON Formatter & Validator

  1. Paste or type your JSON into the input panel.
  2. Click "Format" to beautify with proper indentation.
  3. Invalid JSON shows a clear error with the line position.
  4. Use Copy or Download to export the formatted result.

Examples

Sample object

{"name":"Alice","items":[1,2,3],"active":true}

Frequently Asked Questions

Is my JSON data sent to a server?
No. All formatting and validation runs entirely in your browser. Your data never leaves your device.
What JSON features are supported?
Standard JSON including objects, arrays, strings, numbers, booleans, and null. Trailing commas are flagged as errors.