Is this JSON tool safe to use with private or sensitive data?

Yes. Every feature — formatting, validation, minification, and comparison — runs 100% in your browser. Your JSON is never sent to any server.

How does the JSON comparator work?

The comparator does a deep structural diff between two JSON objects. It highlights keys added in B (green), removed from B (red), and keys with changed values (yellow). Merge arrows let you copy individual changes from one side to the other.

Can I compare JSON arrays?

Yes. The comparator handles both objects and arrays, comparing array elements by index position and highlighting additions, removals, and changes.

⚡ Free Tool

JSON Formatter, Validator & Comparator

Q: What is the difference between JSON formatting and minification?

JSON formatting adds indentation and line breaks to make JSON human-readable. Minification strips all whitespace to produce compact single-line JSON, reducing file size for APIs and network transmission.

Format, validate, minify and compare JSON instantly — 100% in your browser. Your data never leaves your device.

Paste JSON in the input panel to begin

Input JSON

Formatted Output

Input Size — characters in input

Output Size — characters formatted

Keys Found — total JSON keys

Nesting Depth — levels deep

Paste JSON to minify

Input JSON

Minified Output

1

Original Size — before minification

Minified Size — after minification

Saved — characters removed

Reduction — size reduction

JSON A — Original

JSON B — Modified

Click → to copy change to B · Click ← to copy change to A

Paste two JSON objects above and click Compare JSON to see differences.

What You Can Do

🎨

Syntax Highlighting

Keys, strings, numbers, booleans and nulls are color-coded for instant readability.

✅

Real-time Validation

Errors are caught as you type with precise line and position indicators.

⬛

JSON Minification

Strip all whitespace for compact payloads — ideal for APIs and config files.

⇄

Compare & Merge

Deep-diff two JSONs side by side. Use merge arrows to apply individual changes.

⇅

Sort Keys

Alphabetically sort all JSON keys at every nesting level for consistency.

🔒

100% Private

Your data never leaves your browser. No server uploads, no logging, ever.

How to Use

Choose a Tab

Select Format to beautify, Minify to compress, or Compare to diff two JSON objects side by side.

Paste Your JSON

Click Paste or use Ctrl+V to paste your JSON. Click Sample to try with example data.

Run the Action

Click the action button — or use Ctrl+Enter as a keyboard shortcut on any tab.

Copy or Merge

Click Copy Output to copy the result, or use the → ← arrows in Compare to merge individual changes.

Frequently Asked Questions

Yes. Every feature runs 100% in your browser using JavaScript. Your JSON is never sent to any server, making it safe for API keys, config files, and sensitive data.

Formatting (beautifying) adds indentation and line breaks to make JSON readable. Minification strips all whitespace to produce compact single-line JSON, reducing file size for API responses and network transmission.

The comparator does a deep structural diff between two JSON objects. It highlights keys added in B (green), removed from B (red), and keys with different values (yellow). The → and ← merge buttons let you apply individual changes from one side to the other.

Common causes: missing double quotes around keys or strings, single quotes instead of double quotes, trailing commas after the last element, missing closing brackets or braces, and unescaped special characters inside strings.

Yes. The comparator handles both objects and arrays, comparing array elements by index and highlighting additions, removals, and changes.

JSON requires double quotes for all keys and strings, no trailing commas, and no functions or undefined values. It strictly follows RFC 8259. JavaScript objects are more flexible but cannot be directly used as JSON without serialization.