---
title: JSON Formatter, Validator & Beautifier with Tree View
url: https://varstatt.com/toolkit/json
description: Free JSON formatter, validator, and beautifier. Pretty-print with syntax highlighting, minify, validate with error details, and tree view.
section: Developer Toolkit (https://varstatt.com/toolkit)
tags: data
related: JSON (https://varstatt.com/toolkit/json), JSON ↔ YAML (https://varstatt.com/toolkit/json-yaml), YAML (https://varstatt.com/toolkit/yaml)
---
# 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

### Is my JSON sent to a server?

No. All processing happens entirely in your browser. Your data never leaves your machine.

### What's the maximum JSON size?

There's no hard limit, but very large files (50MB+) may slow down your browser. For most use cases it works instantly.

### Does it support JSON5 or JSONC?

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](https://varstatt.com/toolkit/json-yaml).

## Usage

This tool runs entirely in the browser — visit the URL above to use it.

Prefill inputs via URL parameters:

- `https://varstatt.com/toolkit/json?input=...`

## Related Tools

- [JSON](https://varstatt.com/toolkit/json)
- [JSON ↔ YAML](https://varstatt.com/toolkit/json-yaml)
- [YAML](https://varstatt.com/toolkit/yaml)