Format, minify and validate JSON. Errors are reported with the line, the column and the offending text — and unlike most formatters, long ID numbers keep every digit and repeated keys are reported instead of quietly discarded.
Everything runs on your device — nothing is uploaded. Numbers are written back exactly as you typed them, so a 19-digit ID survives formatting intact.
How to Use the JSON Formatter & Validator
The JSON Formatter & Validator makes it easy to clean up messy JSON and catch syntax errors instantly. Paste your JSON or upload a file, then click Format to beautify with consistent indentation, or Minify to compress into a single line. The tool automatically highlights errors with line and column numbers, shows sorted keys if needed, and lets you copy or download the validated output in seconds. It’s perfect for debugging APIs, editing configuration files, or preparing JSON for development and production use.
Common JSON Examples
- Simple Key–Value Pair
{"name": "Alice", "age": 30} - Array of Numbers
[1, 2, 3, 4, 5] - Nested Object
{"user": {"id": 42, "email": "alice@example.com"}} - List of Objects
[{"id":1,"title":"Post A"},{"id":2,"title":"Post B"}] - Configuration Example
{"settings":{"theme":"dark","notifications":true,"volume":75}}
These examples are common JSON structures used in APIs, configuration files, and data storage. You can paste them directly into the formatter to see pretty-printed output, validate syntax, or test minification. Feel free to adapt them by adding extra keys, nesting objects, or combining arrays to match your own use cases.