JSON Formatter — Format & Beautify JSON Online

What is a JSON Formatter?

A JSON formatter (also called a JSON beautifier, JSON pretty printer, or JSON indenter) takes compact or minified JSON and adds indentation and line breaks to make it human-readable. This free online JSON formatter works on JSON of any size — paste minified API output and get clean, readable JSON in one click. Choose 2-space, 4-space, or tab indentation. The tool also validates your JSON as you type and highlights the exact line and column of any syntax errors. Everything runs entirely in your browser — your data never leaves your device.

JSON Formatter vs JSON Beautifier vs JSON Indenter

These terms are interchangeable. JSON formatter, JSON beautifier, JSON pretty printer, and JSON indenter all describe the same operation: adding whitespace and line breaks to make JSON readable. This tool does all of them. If you need the opposite — removing whitespace to shrink file size — use the JSON Minifier. To check whether your JSON is syntactically correct, use the JSON Validator.

How to format JSON in Python

Use json.dumps(data, indent=2) to pretty-print JSON in Python. For quick browser-based formatting without writing code, paste your JSON above.

import json
data = {"name": "JSON Indent", "version": "2.0"}
print(json.dumps(data, indent=2))

How to pretty print JSON in JavaScript

Use JSON.stringify(obj, null, 2) to format JSON in JavaScript. The third argument controls the indentation level.

const data = { name: "JSON Indent", version: "2.0" };
console.log(JSON.stringify(data, null, 2));

• Format and pretty-print JSON instantly — no signup required
• Validate JSON syntax with exact error line and column
• Sort keys alphabetically for consistent output
• Copy formatted JSON to clipboard or download as a file
• Works offline — 100% client-side, no data sent to any server

Other Free JSON Tools

• JSON Validator — check JSON syntax with exact error line and column numbers (RFC 8259 compliant)
• JSON Minifier — strip whitespace to compress JSON for API responses and reduce payload size
• JSON Diff — compare two JSON objects side by side and highlight every added, removed, and changed key

Frequently Asked Questions