JSON Formatter Online - Format, Lint & Parse JSON Free

What is JSON Formatter?

JSON (JavaScript Object Notation) is a lightweight data interchange format composed of key-value pairs. A JSON Formatter converts hard-to-read minified JSON strings into a readable, indented format (Pretty Print), or compresses them by removing unnecessary whitespace (Minify). It is an essential tool for daily development tasks such as debugging API responses and reviewing logs. All processing happens entirely in your browser, so even JSON containing sensitive data can be formatted safely.

See also: JSON to Code · JSON Diff · JSON Tree Viewer

How to Use

1. Paste your JSON into the left text area
2. Click 'Pretty Print' or 'Minify' button
3. The result appears on the right. Use the copy button to copy to clipboard

Usage Examples

Input (Minified JSON):
{"name":"John Smith","age":30,"active":true}

After formatting (Pretty Print / 2 spaces):
{
  "name": "John Smith",
  "age": 30,
  "active": true
}

Practical use: Copy an API response, paste it into this tool, and format it to inspect the JSON structure while debugging

FAQ

Is my data sent to a server?

No. All processing happens in your browser, so your JSON data is never transmitted externally.

Can it handle large JSON files?

It depends on your browser's memory, but it works fine for typical use cases. JSON files of several MB are generally not a problem.

What happens if I enter invalid JSON?

An error message is displayed and processing stops. Please check your input for issues and correct them.

Is indentation fixed at 2 spaces?

Currently formats with 2-space indentation.

What is the difference between Minify and Pretty Print?

Pretty Print adds indentation and line breaks for human readability. Minify removes unnecessary whitespace and newlines to reduce data size, which is useful for reducing API request payload sizes.

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