JSON Formatter — Format & Beautify JSON Online
Paste your JSON to format, view, and validate it instantly. Free, fast, works in your browser.
About JSON Formatter
This free online JSON formatter makes it easy to format 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 and highlights the exact line and column of any errors. Everything runs entirely in your browser — your data never leaves your device.
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
Frequently Asked Questions
What is a JSON formatter?
A JSON formatter takes minified or unformatted JSON and adds indentation and line breaks to make it human-readable. Also called a JSON beautifier or JSON indenter.
Does this tool store my data?
No. All processing happens entirely in your browser. Your JSON data is never sent to any server.
Can I also validate my JSON here?
Yes — the formatter validates as you type and shows errors. For detailed validation with line/column info, use the dedicated JSON Validator.
How do I reduce JSON file size?
Use our JSON Minifier to strip all whitespace and compress JSON to the smallest valid string.
How do I pretty print JSON?
Pretty printing JSON adds indentation and line breaks to make it human-readable. Paste your JSON in the input above and click Format — this tool pretty prints JSON automatically with your chosen indent size (2 spaces, 4 spaces, or tabs).
How do I format JSON online for free?
Paste your JSON into the input panel above — formatting happens automatically. This tool is completely free with no account, no signup, and no usage limits. Your data never leaves your browser.
What is the difference between a JSON formatter and JSON beautifier?
They are the same thing. JSON formatter, JSON beautifier, JSON pretty printer, and JSON indenter all refer to tools that add whitespace and indentation to make JSON human-readable. This tool does all of the above.
How do I format JSON in Python?
Use json.dumps(data, indent=2) to format JSON in Python. For browser-based formatting without writing code, paste your JSON in the tool above.