JSON Formatter, Minifier & Unminifier Online — Free Tool

Format, minify and unminify JSON data instantly with our free online tool. Beautify with custom indentation, validate syntax, and convert to YAML, CSV or XML. All processing happens in your browser — no data sent to any server.

Input

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Output

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JSON Formatter & Minifier

Format, minify, unminify and beautify your JSON code. Free online tool to format, optimize and compress your JSON files with detailed statistics.

Features

Our JSON tool offers three main features:

Minify

Reduce the size of your JSON code by removing spaces, comments and unnecessary characters.

Unminify

Restore the readability of your minified JSON code by adding spaces and line breaks.

Beautify

Format and beautify your JSON code with customizable indentation (2 or 4 spaces, or tabs) and get detailed statistics.

Basic example

Input JSON

{
  "name": "FastMinify",
  "version": "1.0.0",
  "description": "A fast minifier tool",
  "features": [
    "JavaScript minification",
    "CSS optimization",
    "JSON compression"
  ]
}

Minified JSON

{"name":"FastMinify","version":"1.0.0","description":"A fast minifier tool","features":["JavaScript minification","CSS optimization","JSON compression"]}

Minification options

Compression Level

Controls the aggressiveness of JSON compression

ConservativeConservative - Whitespace removal only

NormalNormal - Basic optimizations

AggressiveAggressive - Advanced optimizations and cleanup

Compression examples:

Original code

{
  "name": "test",
  "value": 42,
  "active": true,
  "items": [1, 2, 3]
}

Conservative

{"name":"test","value":42,"active":true,"items":[1,2,3]}

Normal

{"name":"test","value":42,"active":true,"items":[1,2,3]}

Aggressive

{"name":"test","value":42,"active":!0,"items":[1,2,3]}

Optimize Numbers

Optimizes number representation (removes unnecessary zeros)

Comparison with/without option:

Original code

{
  "price": 10.00,
  "count": 0,
  "rate": 1.0
}

With optimizeNumbers: true

{"price":10,"count":0,"rate":1}

With optimizeNumbers: false

{"price":10.00,"count":0,"rate":1.0}

Difference

Numbers are optimized (unnecessary zeros removed)

Remove Null Values

Removes properties with null values

Comparison with/without option:

Original code

{
  "name": "test",
  "value": null,
  "active": true,
  "count": null
}

With removeNullValues: true

{"name":"test","active":true}

With removeNullValues: false

{"name":"test","value":null,"active":true,"count":null}

Difference

Properties with null values are removed

Remove Empty Arrays

Removes empty arrays from JSON

Comparison with/without option:

Original code

{
  "name": "test",
  "items": [],
  "active": true,
  "tags": []
}

With removeEmptyArrays: true

{"name":"test","active":true}

With removeEmptyArrays: false

{"name":"test","items":[],"active":true,"tags":[]}

Difference

Empty arrays are removed

Sort Object Keys

Sorts object keys alphabetically

Comparison with/without option:

Original code

{
  "zebra": "striped",
  "apple": "red",
  "banana": "yellow"
}

With sortObjectKeys: true

{"apple":"red","banana":"yellow","zebra":"striped"}

With sortObjectKeys: false

{"zebra":"striped","apple":"red","banana":"yellow"}

Difference

Object keys are sorted alphabetically

Beautify Options

Options for formatting and beautifying JSON (Beautify only, not for Minify/Unminify)

Indentation Size

Sets the number of spaces or tabs for indentation during Beautify

Original code

{"name":"test","value":42}

With 2 spaces

{
  "name": "test",
  "value": 42
}

With 4 spaces

{
    "name": "test",
    "value": 42
}

Difference

Indentation is customizable only for Beautify. Unminify always uses 2 spaces.

Indentation Type

Use spaces or tabs for indentation during Beautify

Original code

{"name":"test","value":42}

With spaces

{
  "name": "test",
  "value": 42
}

With tabs

{
	"name": "test",
	"value": 42
}

Difference

Spaces are more standard, tabs may be preferred according to your code conventions.

JSON Statistics

Detailed information about your JSON structure

JSON statistics are automatically calculated and displayed in the results panel after each operation (Minify, Unminify, Beautify).

Keys

Objects

Arrays

Max Depth

Strings

Numbers

Booleans

Nulls

These statistics help you understand the structure and complexity of your JSON.

Converting JSON to Other Formats

Our tool supports converting JSON to YAML, CSV, and XML formats. This is useful for data migration, configuration file management, or integrating with systems that require different formats. Simply paste your JSON, validate it, then select the target format from the conversion dropdown. You can also convert from these formats back using our XML tool.

JSON Validation

Before minifying or formatting, our tool validates your JSON syntax. Invalid JSON is flagged with clear error messages showing the exact line and position of the issue. This built-in validation saves time compared to using separate JSON validators.

JSON Formatter vs Minifier — Understanding the Difference

A JSON formatter (or beautifier) adds indentation and line breaks to make JSON readable and easy to navigate. A JSON minifier does the opposite — it removes all unnecessary whitespace to reduce file size for API responses and data transfer. Our tool offers both in one interface with customizable indentation.

Frequently Asked Questions

Everything you need to know about JSON minification, formatting and conversion

Why minify JSON?

JSON minification removes whitespace and formatting to reduce file size. This is especially important for API responses, configuration files, and data stored in databases where every byte matters for performance.

How does JSON minification work?

Our tool parses the JSON structure, validates it, then re-serializes it without any whitespace, indentation or line breaks. The data remains identical — only the formatting is removed.

Can I unminify or format JSON?

Yes, paste any minified JSON and click Unminify to restore readable formatting with proper indentation. You can customize the indentation level (2 spaces, 4 spaces, or tabs) to match your preferred style.

Is my JSON processed securely?

All processing happens entirely in your browser using JavaScript. No data is sent to any server, ensuring complete privacy for sensitive API data and configuration files.

Can I convert JSON to other formats?

Yes, our tool supports converting JSON to YAML, CSV, and XML. This is useful for data migration or working with systems that require different data formats.

Does the tool validate JSON?

Yes, the tool automatically validates your JSON before processing. Syntax errors are highlighted with clear messages showing the line and position of the issue.

What is the difference between minify and format?

Minification compresses JSON by removing all whitespace to minimize file size. Formatting (beautification) adds indentation and line breaks for readability. They serve opposite purposes — our tool handles both.

Can I minify API responses?

Absolutely. Paste any JSON API response into our tool to minify it for storage or transmission. The tool handles deeply nested objects, arrays, and all valid JSON data types.

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