Developer Tools

JSON Formatter & Validator

Format, validate, and minify JSON with syntax highlighting and error detection. Sort keys alphabetically and copy the result instantly — browser-only.

Beautify & Validate
Minify
Sort Keys
Error Detection
Browser-only

Indent:

Sort keys

Input JSON1 lines · 0 chars

Output

Output will appear here

JSON formatter and validator

JSON (JavaScript Object Notation) is a text format built from objects, arrays, strings, numbers, booleans, and null. Strict syntax makes reliable parsing possible, but a missing quote, comma, or bracket can invalidate an entire document.

Common operations

Operation	Purpose
Beautify	Add indentation and line breaks
Minify	Remove insignificant whitespace
Validate	Confirm syntax without changing data
Sort keys	Normalize object-key order

{
  "name": "Ada",
  "active": true,
  "roles": ["admin", "author"]
}

The formatter uses native JSON parsing and serialization in the browser. Syntax errors are reported without sending source to a server. Sorting is useful for reviewing configuration changes, while minification is useful for compact transport.

JSON versus JavaScript

JSON requires double-quoted property names and strings, and does not allow comments, trailing commas, functions, or undefined. JavaScript object literals can contain those features, so JavaScript source is not automatically valid JSON.

Frequently Asked Questions

What does 'Beautify' do?: Beautify (format) parses the JSON and re-serializes it with readable indentation. This makes it easy to read deeply nested JSON objects. You can choose between 2 or 4-space indentation.
What does 'Minify' do?: Minify removes all unnecessary whitespace, newlines, and indentation from JSON, producing the smallest possible representation. This is useful for reducing payload size in API responses and configuration files.
Is my JSON data sent to a server?: No. All JSON processing happens entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). Your data is never sent to any server.
What does 'Sort keys' do?: Sort keys re-orders the object properties alphabetically before formatting. This makes it easier to compare JSON objects or find specific keys in large payloads.
How does syntax highlighting work?: The output uses a regex-based tokenizer that color-codes JSON keys (red), string values (green), numbers (blue), booleans (amber), and null (grey) - making the structure immediately readable.

Disclaimer

This tool is provided for general informational and utility purposes only. Results may be inaccurate, incomplete, outdated, or contain errors. Always verify results before relying on or using them.

Some tools may use AI, automated processing, third-party services, or server-side processing. Do not rely on these tools as a substitute for professional advice.

Use at your own risk. BestToolOnline makes no guarantees regarding the accuracy, reliability, completeness, availability, or suitability of results, to the maximum extent permitted by applicable law.

See our Terms of Service and Privacy Policy for complete details.

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JSON formatter and validator

Common operations

Operation

Purpose

Beautify

Add indentation and line breaks

Minify

Remove insignificant whitespace

Validate

Confirm syntax without changing data

Sort keys

Normalize object-key order

{ "name": "Ada", "active": true, "roles": ["admin", "author"] }

JSON versus JavaScript

Frequently Asked Questions

What does 'Beautify' do?

Beautify (format) parses the JSON and re-serializes it with readable indentation. This makes it easy to read deeply nested JSON objects. You can choose between 2 or 4-space indentation.

What does 'Minify' do?

Minify removes all unnecessary whitespace, newlines, and indentation from JSON, producing the smallest possible representation. This is useful for reducing payload size in API responses and configuration files.

Is my JSON data sent to a server?

No. All JSON processing happens entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). Your data is never sent to any server.

What does 'Sort keys' do?

Sort keys re-orders the object properties alphabetically before formatting. This makes it easier to compare JSON objects or find specific keys in large payloads.

How does syntax highlighting work?

The output uses a regex-based tokenizer that color-codes JSON keys (red), string values (green), numbers (blue), booleans (amber), and null (grey) - making the structure immediately readable.

Disclaimer

Some tools may use AI, automated processing, third-party services, or server-side processing. Do not rely on these tools as a substitute for professional advice.