JSON Formatter & Beautifier Online
Free online JSON formatter, beautifier & validator. Pretty print minified JSON with custom indentation, dark mode, syntax highlighting, and 100% client-side privacy.
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Frequently Asked Questions
What is a JSON formatter and beautifier?
A JSON formatter (also called a JSON beautifier or JSON prettifier) parses compact, unformatted, or minified JSON text and applies consistent indentation, line breaks, and whitespace. This makes complex nested structures easy for developers to read, audit, and debug without altering any data values.
How do I format minified or compact JSON in the browser?
Simply paste your raw or minified JSON string into the input panel, or drag and drop a .json file. The formatter immediately renders formatted JSON with syntax highlighting in your chosen spacing (2 spaces, 4 spaces, or tabs) with zero delay.
What is the difference between JSON formatting, beautifying, and pretty printing?
They are identical concepts. "JSON Beautifier" is the most searched consumer term globally, "JSON Formatter" is standard in developer documentation, and "Pretty Print" is standard in command-line tools (such as jq or Python json.tool). Our tool performs all three.
Is my JSON data uploaded or stored on your servers?
No. All parsing, validation, and beautification runs 100% client-side in your browser using JavaScript and Web Workers. Your data, API tokens, passwords, and private records never leave your local machine.
Can this tool format and validate large JSON files (up to 100 MB)?
Yes. Our engine offloads heavy JSON processing to asynchronous background Web Workers. This ensures your browser tab remains completely responsive without freezing or crashing, even when inspecting multi-megabyte API dumps.
How do I pretty print JSON in Python, JavaScript, and Bash?
In Python: json.dumps(data, indent=2). In JavaScript: JSON.stringify(obj, null, 2). In Bash terminal: echo '{"a":1}' | jq . or echo '{"a":1}' | python3 -m json.tool.
What indentation options are supported?
You can choose between 2 spaces (standard for JavaScript and Node.js), 4 spaces (standard for Python, Java, and C#), or tab indentation (preferred in Go) using the toolbar dropdown.
How does key sorting work and why is it useful for git diffs?
The Sort Keys toggle alphabetically reorders object properties at all nesting levels. This normalises key order across different API outputs, eliminating false differences when comparing files in Git pull requests.