How does the JSON validator detect syntax errors?

The JSON validator parses your code in real-time, highlighting exact line and column numbers where trailing commas, unescaped characters, or missing quotes violate the strict JSON specification.

Is my JSON data kept secure and private?

Yes, all JSON formatting and validation happens 100% locally in your browser. No sensitive API payloads or tokens are transmitted to any server.

JSON Formatter & Validator Online — Beautifier, Minifier & Syntax Checker

JSON (JavaScript Object Notation) is a lightweight, text-based format used by applications and servers to exchange structured data. This tool instantly validates, formats, and minifies your JSON — entirely inside your browser, with no data ever sent to a server.

Paste or Type Your JSON

Paste your JSON data into the Input JSON box on the left. The tool validates it live as you type — a green banner confirms valid JSON, while an error banner shows the exact Line and Column of any mistake.

{"name":"Amit","age":25,"active":true}

Format (Beautify) Your JSON

Shortcut: Enter or Ctrl + Enter

Click Format to convert compressed JSON into a clean, indented, color-highlighted structure. Use the Indent dropdown to choose 2 spaces, 4 spaces, or Tab.

{
  "name": "Amit",
  "age": 25,
  "active": true
}

Minify for Production

Click Minify to strip all whitespace and compress your JSON to a single line — ideal for APIs, config files, and reducing payload size.

{"name":"Amit","age":25,"active":true}

The stats bar below the output shows exactly how many bytes were saved.

Sort Keys Alphabetically

Enable Sort keys A→Z in the options bar to reorder all object keys alphabetically at every nesting level. This makes comparing two large JSON config files significantly easier.

Copy or Download Output

Use the Copy button in the toolbar — or the small copy icon in the top-right corner of the output box — to copy the result to your clipboard instantly.

Click Download to save the formatted or minified JSON as a formatted.json file on your device.

Understand & Fix Errors

Invalid JSON shows a red banner with the exact error, line, and column. The three most common mistakes are:

• Keys without double quotes: {name:"x"} ❌

• Trailing comma: [1,2,3,] ❌

• Single quotes: {'a':1} ❌ — JSON requires "

💡

Pro Tips Click Sample to instantly load a rich example JSON and explore all features · Stats below the output panel show live Size, Lines, Total Keys & Max Depth · Your Dark / Light mode preference is saved automatically · Everything runs 100% client-side — your JSON data never leaves your browser.

Frequently Asked Questions

What does the JSON Formatter do?

It formats, beautifies, validates, minifies, sorts keys, and repairs JSON data structures in real time.

Is my JSON data kept private?

Yes, all parsing, formatting, and validation occur 100% locally in your browser memory. No data is ever uploaded or stored externally.

Can I convert JSON to CSV or XML?

Yes, built-in export features allow seamless conversion between JSON, CSV, and XML formats with a single click.

How does the JSON Auto-Repair feature work?

Auto-repair automatically fixes common syntax issues like trailing commas, single quotes, unquoted key names, and missing brackets.

Is there a size limit for formatting JSON files?

Because processing runs locally in browser memory, you can easily handle multi-megabyte JSON payloads with sub-second performance.

JSON Formatter & Validator — Step-by-Step Guide