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JSON Formatter— Free & Private

Format, validate, and minify JSON data in your browser. Supports syntax highlighting.

Processed in your browser. Nothing uploaded.

What Is JSON Formatting?

JSON formatting takes raw or minified JSON data and restructures it with proper indentation, line breaks, and syntax highlighting to make it easy to read and debug. The formatter also validates your JSON, catching syntax errors like missing commas, unmatched brackets, or invalid values before they cause problems in your application. Our tool processes everything client-side in your browser, so sensitive API responses and configuration data never leave your machine.

How to Use JSON Formatter

  1. Paste your JSON

    Paste raw or minified JSON into the input area, or upload a .json file.

  2. Format or minify

    Click Format to beautify the JSON with proper indentation, or Minify to compress it.

  3. Review and copy

    Inspect the formatted output with syntax highlighting and copy it to your clipboard.

Why Use Our JSON Formatter?

Client-side processing — sensitive data never leaves your browser
Syntax highlighting for keys, values, strings, and numbers
Real-time validation with clear error messages
Format (beautify) and minify modes
Adjustable indentation (2 or 4 spaces, or tabs)
One-click copy to clipboard
Handles large JSON files without performance issues
Collapsible tree view for navigating nested structures

Frequently Asked Questions

Can the formatter handle very large JSON files?

Yes. The tool is optimized for large payloads and can handle files several megabytes in size. Performance depends on your browser and available memory.

Does the formatter validate JSON or just format it?

It does both. Invalid JSON triggers a detailed error message pointing to the approximate location of the syntax error, helping you debug quickly.

What indentation options are available?

You can choose between 2 spaces, 4 spaces, or tab indentation. The default is 2 spaces, which is the most common convention in web development.