JSON Formatter & Validator Online – Beautify, Minify & Validate JSON

Format, validate, and analyze JSON online with a powerful browser-based JSON formatter and schema validator. No uploads. No 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
Disclaimer: This tool validates syntax and schema structure but does not guarantee business logic correctness. All processing happens locally in your browser—no data is transmitted to any server.

How to Use

  1. 1Paste your JSON data into the input area
  2. 2Choose an action: Format (beautify), Minify, Sort Keys, or Validate
  3. 3For Schema Validation: paste your JSON Schema and click "Validate Schema"
  4. 4View results in Text or Tree view
  5. 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 parsing and validation occur locally in your browser.

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.