What can this JSON tool do?

It can format (prettify) JSON with custom indentation, minify JSON to reduce size, and validate JSON with detailed error messages including line and column numbers.

Does it support large JSON files?

Yes. All processing happens in your browser with no size limits imposed by a server. Performance depends on your device's capabilities.

Is my JSON data secure?

Yes. Your JSON data never leaves your browser. No data is sent to any server, making it safe to use with sensitive or proprietary data.

Can the JSON Formatter fix invalid JSON?

The tool validates your JSON and shows syntax errors with descriptions, but it cannot automatically fix invalid JSON. You will need to correct syntax errors manually based on the error messages provided.

Can I use JSON Formatter on my phone?

Yes, JSON Formatter works on any device with a modern web browser, including smartphones and tablets.

What indentation options are available?

You can choose 2-space, 4-space, or tab indentation for prettified output. The minify option removes all whitespace to produce the smallest possible output.

All Tools

Generators & Utilities

JSON Formatter

Works on phones

Format & Validate JSON Instantly

Free online JSON formatter, validator, and minifier. Works in your browser — no data leaves your device.

Indent:

Paste Your JSON

0 / 500,000 characters

Output

0 characters

About JSON Formatter

Our free JSON formatter tool helps you format, validate, and minify JSON data instantly. Perfect for developers, API testers, and data analysts who need to work with JSON data.

Features:

Format JSON with custom indentation (2 spaces, 4 spaces, or tabs)
Minify JSON to reduce size
Validate JSON with detailed error messages
Error location with line and column numbers
JSON statistics: keys, items, depth, and size
Copy formatted output with one click
Works entirely in your browser — no data sent to servers
Completely free with no signup required

Standards & References

Last updated: 2026-03-10

Generators & Utilities

JSON Formatter

Works on phones

JSON Formatter

Format & Validate JSON Instantly

About JSON Formatter

Features:

Standards & References

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