JSON Formatter & Validator Online – Beautify, Minify & Validate JSON
Beautify, minify, sort keys, and validate JSON (including basic schema checks) entirely in your browser. No uploads or backend processing.🔒 All processing happens in your browser. Your data never leaves your device.
About JSON
JSON (JavaScript Object Notation) is a lightweight data-interchange format that's easy for humans to read and write, and easy for machines to parse and generate.
Common Use Cases:
- API request/response payloads
- Configuration files
- Data storage and exchange
- Web application state management
How to Use
- 1Paste your JSON data into the input area
- 2Choose an action: Format (beautify), Minify, Sort Keys, or Validate
- 3For Schema Validation: paste your JSON Schema and click "Validate Schema"
- 4View results in Text or Tree view
- 5Copy formatted JSON or review validation errors
Example
Input:
{"name":"John","age":30,"city":"New York"}Output:
Formatted:
{
"name": "John",
"age": 30,
"city": "New York"
}Frequently Asked Questions
What does a JSON formatter do?
It restructures JSON data into a readable, properly indented format without changing the data itself.
Does this tool validate JSON schemas?
Yes. You can validate JSON documents against provided JSON Schemas using client-side validation.
Is my JSON data uploaded anywhere?
No. All formatting and validation happen locally in your browser—your data never leaves your device.
What schema versions are supported?
This tool supports basic JSON Schema validation including type checking, required fields, enums, and nested objects.
Can I use this for large JSON files?
Yes, but performance depends on your device and browser memory. Very large files (>10MB) may be slow.