How do I format JSON in one click?

Paste your JSON into the editor at jsonwebtools.com and click the Prettify button. Your JSON is instantly formatted with proper indentation. You can choose 2-space, 4-space, or tab indentation.

JSON Formatter Online

Paste any minified or messy JSON and instantly format it with proper indentation. Free JSON beautifier, prettifier, and validator - no signup needed.

Format JSON Now →

What is a JSON Formatter?

A JSON formatter (also called JSON beautifier or JSON prettifier) converts compact, single-line JSON into a well-indented, human-readable format. When APIs return minified JSON like {"name":"John","age":30,"city":"NYC"}, a formatter turns it into:

{
  "name": "John",
  "age": 30,
  "city": "NYC"
}

How to Format JSON Online

Click "Format JSON Now" above to open the tool
Paste your JSON into the editor (supports files up to 10MB)
Click Prettify or press Ctrl+Shift+F
Choose indentation: 2 spaces, 4 spaces, or tabs
Copy the formatted output or download as a file

JSON Formatting Options

Style	Use Case	Output
2-space indent	JavaScript/Node.js standard	Most common
4-space indent	Python/Java standard	More readable
Tab indent	Team preference	Adjustable width
Minified	Production / API responses	Smallest size
Sorted keys	Diffing / comparison	Alphabetical order

JSON Formatter vs JSON Validator - What's the Difference?

Many developers confuse these two tools:

JSON Formatter - Takes valid JSON and reformats it for readability. Does not check for errors.
JSON Validator - Checks if JSON is syntactically correct. Reports exact errors with line numbers.
JSON Web Tools does both - When you click Prettify, it validates first, then formats. If there are errors, it shows exactly where.

Frequently Asked Questions

Is my JSON data safe when using this formatter?

Yes. JSON Web Tools formats JSON entirely in your browser using JavaScript. Your data never leaves your device and is never sent to any server. The tool works offline after the first page load.

Can I format large JSON files?

Yes. The tool handles JSON files up to several megabytes efficiently. For very large files, the Monaco editor handles big files with virtual rendering, keeping the interface responsive even with 10,000+ line files.

What if my JSON has errors?

If your JSON is invalid, the formatter shows the exact error with line and column number. You can use the JSON Repair tool to automatically fix common errors like missing commas, trailing commas, single quotes, and unquoted keys.

What is the difference between JSON formatter and JSON validator?

A JSON formatter takes valid JSON and adds indentation and line breaks to make it readable. A JSON validator checks whether the JSON is syntactically correct. JSON Web Tools does both simultaneously — it validates first, then formats if the input is valid.

Can I format minified JSON?

Yes. Paste any minified (single-line) JSON and click Format. The tool expands it into properly indented, multi-line output with customizable indent size (2 spaces, 4 spaces, or tabs).

Does the formatter support JSON5 or comments?

The standard formatter follows the strict JSON spec (no comments, no trailing commas). Use the JSON Repair tool which is more tolerant of JSON5-style input and can convert it to valid JSON.

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