Is the JSON formatter secure?

Yes, all processing happens directly in your browser. No data is sent to any server. Your JSON data never leaves your device, ensuring complete privacy and security.

What's the difference between prettify and minify?

Prettify formats JSON with proper indentation and line breaks for human readability. Minify removes all unnecessary whitespace to reduce file size, useful for production environments or API payloads.

Can it handle large JSON files?

Yes, the tool can handle JSON files up to several megabytes. Since processing happens in your browser, performance depends on your device's capabilities. For very large files, processing may take a few seconds.

Does it support JSON5 or other extensions?

The tool primarily targets standard JSON but can fix many JSON5 features like trailing commas and unquoted keys, converting them to valid JSON. Comments are removed during the fixing process.

JSON Formatter & Validator

Q: What JSON errors can this tool fix?

The JSON formatter can fix trailing commas, missing quotes around keys, single quotes instead of double quotes, missing brackets or braces, invalid escape sequences, and JavaScript-style comments. It attempts to convert JavaScript object notation to valid JSON.

Fix broken JSON, make it pretty, catch syntax errors

Works in your browser • Fixes bad JSON • Nothing uploaded

Input JSON

0 characters

Formatted Output

Fixes broken JSON

Catches trailing commas, bad quotes, missing brackets

Browser-Based

Everything stays in your browser. We don't see your JSON.

Format Options

Make it pretty or squish it small

Common JSON Errors We Fix

✓Trailing commas in arrays and objects

✓Single quotes instead of double quotes

✓Unquoted object keys

✓JavaScript comments in JSON

Frequently Asked Questions

What JSON errors can this tool fix?

It fixes trailing commas, bad quotes (single to double), unquoted keys, JS comments, and missing brackets. Basically turns messy JS objects into proper JSON.

Is my JSON data secure?

Yep, it all runs in your browser. Nothing gets uploaded anywhere. Your JSON stays on your computer.

What's the size limit?

Pretty big - several megabytes easy. Really huge files might take a second since it's all running in your browser.

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