JSON Formatter

Paste any JSON to instantly format, validate, and explore it in an interactive tree view. Supports minifying, sorting keys, and fixing common JSON errors.

Input JSON

Indent:

✓ Valid JSON

{
  "name": "DevToolsHub",
  "version": "1.0.0",
  "features": [
    "format",
    "validate",
    "tree"
  ],
  "active": true,
  "score": 98.5
}

Frequently Asked Questions

What does the JSON formatter do?

It parses your JSON, validates it, and reformats it with consistent indentation. It also shows a minified version (all whitespace removed) and an interactive tree view for exploring nested structures.

Is my data sent to a server?

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

Why does my JSON fail validation?

Common issues: trailing commas (e.g., `[1, 2,]`), single quotes instead of double quotes, unquoted keys, comments (JSON doesn't support comments), or undefined values. The error message points to the exact problem.

What is the tree view?

The tree view renders your JSON as an interactive collapsible tree. Useful for exploring deeply nested objects without losing context. Click any object/array to collapse or expand it.