Is my JSON data safe?

Absolutely. JSONPretty runs 100% in your browser. Your JSON data never leaves your device — no servers, no uploads, no tracking. Everything is processed locally using JavaScript.

What is JSON formatting (pretty printing)?

JSON formatting, also known as pretty printing, adds proper indentation and line breaks to compressed or minified JSON data. This makes it human-readable and easier to debug, review, and understand the structure of your data.

Can I validate JSON with this tool?

Yes! JSONPretty automatically validates your JSON when you click Format or Minify. If there's a syntax error, it shows the exact line and column number where the error occurs, making it easy to find and fix issues.

What's the difference between Format and Minify?

Format (pretty print) adds indentation and newlines to make JSON readable. Minify does the opposite — it removes all unnecessary whitespace to create the smallest possible output, ideal for APIs and data transfer.

Is there a file size limit?

There's no hard limit. Since everything runs in your browser, performance depends on your device. JSONPretty handles files up to several megabytes smoothly on modern browsers.

Does it support JSON with comments?

Standard JSON does not allow comments. If your JSON contains comments (like JSONC), you'll need to remove them first. JSONPretty follows the strict JSON specification (RFC 8259).

Can I change the indentation level?

Yes! Use the indent dropdown to choose between 2 spaces, 4 spaces, 8 spaces, or tab indentation. The default is 2 spaces, which is the most common convention.

Do I need to create an account?

No. JSONPretty is completely free with no sign-up, no account, and no limits. Just paste your JSON and go.

🔒 Privacy First — 100% Client-Side

JSON Formatter
& Validator

Pretty print, validate, and minify JSON instantly. Your data never leaves your browser — no servers, no uploads, completely private.

Indent:

Input

161 bytes

Output

Formatted JSON will appear here…

Why Developers Choose JSONPretty

🔒

100% Private

Your JSON data never leaves your browser. No servers, no uploads, no tracking. Everything is processed locally with JavaScript — complete privacy guaranteed.

✨

Syntax Highlighting

Color-coded JSON output makes it easy to distinguish keys, strings, numbers, booleans, and null values at a glance. Works in both light and dark mode.

🔍

Error Detection

Instantly find JSON syntax errors with precise line and column numbers. Stop guessing where the missing comma or bracket is — JSONPretty pinpoints it for you.

⚡

Instant Results

Format, validate, or minify JSON in milliseconds. No page reloads, no waiting for servers. Runs entirely in your browser for maximum speed.

How to Format JSON Online

1

Paste Your JSON

Copy your raw, minified, or messy JSON and paste it into the input panel. You can also type directly or load a sample.

2

Click Format or Minify

Hit the Format button to pretty-print with syntax highlighting. Choose your preferred indentation (2 or 4 spaces). Or click Minify to compress.

3

Copy & Use

Your formatted JSON appears instantly with color highlighting. Click Copy to save it to your clipboard. Stats show line count, byte size, and key count.

Frequently Asked Questions

About JSONPretty

JSONPretty is a free online JSON formatter and validator built for developers, data engineers, and anyone who works with JSON data. Whether you need to pretty-print a minified API response, validate a configuration file, or compress JSON for production, JSONPretty handles it instantly.

Unlike most online JSON tools that send your data to a server, JSONPretty runs 100% in your browser. Your JSON never leaves your device — no uploads, no server processing, no data collection. This makes it safe for formatting sensitive configuration files, API keys, database exports, and any data you wouldn't want transmitted over the internet.

Built with modern web standards, JSONPretty features syntax highlighting with distinct colors for keys, strings, numbers, booleans, and null values. The error detection system pinpoints the exact line and column of syntax errors, making it easy to fix broken JSON. Choose between 2-space, 4-space, 8-space, or tab indentation to match your team's coding standards.

JSONPretty supports both light and dark themes, responds beautifully on mobile devices, and works offline after the initial page load. It's the JSON tool you'll bookmark and use every day.

JSON Formatter& Validator