JSON Formatter & Validator

Free JSON formatter, validator, and beautifier. Pretty-print with syntax highlighting, minify, validate with error details, and tree view.

How It Works

1

Paste or type your JSON

Enter raw JSON into the editor. The tool accepts any valid JSON structure.

2

Format, minify, or validate

Click Format to pretty-print with 2-space indentation, Minify to compress, or Validate to check for errors.

3

Explore and copy

Toggle to tree view for interactive exploration. Copy the result with one click.

FAQ

No. All processing happens entirely in your browser. Your data never leaves your machine.
There's no hard limit, but very large files (50MB+) may slow down your browser. For most use cases it works instantly.
This tool validates strict JSON per the RFC 8259 spec. Comments and trailing commas are not valid JSON and will be flagged as errors. If you're working with config files that use comments, consider writing in YAML and converting with the JSON-YAML converter.

Built & Maintained by Varstatt

Varstatt is a one-person product studio run by Jurij Tokarski, product engineer since 2011. These tools are free and open — no signup, no catch.