JSON Formatter
Free online JSON formatter and beautifier. Paste any JSON and instantly get clean, readable, indented output. Runs entirely in your browser — your data is never sent to any server.
What is a JSON Formatter?
A JSON formatter (also called a JSON beautifier or JSON pretty printer) takes compact or inconsistently indented JSON and rewrites it with uniform indentation, newlines between keys, and consistent spacing. The output is semantically identical — it parses to exactly the same data structure — but is dramatically easier to read and review.
Raw JSON responses from APIs, databases, and configuration files are often minified to reduce size. Formatted JSON lets you quickly understand nested structures, spot missing keys, and identify the shape of a data response without straining to parse a single-line blob manually.
This formatter runs entirely in your browser using JavaScript's built-in JSON.parse() and JSON.stringify(). Your data is never sent to any server, making it safe to use with API responses, database records, and any other sensitive JSON data.
Frequently asked questions
What does a JSON formatter do?
A JSON formatter takes compact or poorly indented JSON and rewrites it with consistent indentation, line breaks, and key sorting (optionally). The formatted output is semantically identical — it just becomes much easier to read and review.
Does this JSON formatter store my data?
No. This tool runs entirely in your browser using JavaScript. Your JSON data never leaves your machine — there are no server calls, no logging, and no data retention. It is safe to use with sensitive or production JSON.
What happens if I paste invalid JSON?
If the JSON is invalid, the formatter will display a syntax error with the line and column position of the problem. Common errors include trailing commas, unquoted keys, and single-quoted strings — all of which are not valid in JSON.
What indentation options does this JSON formatter support?
The formatter supports 2-space indentation (the most common), 4-space indentation, and tab indentation. You can switch between them using the indentation selector and the output will update instantly.
Can I use this to validate JSON at the same time?
Yes. If your JSON is valid, the formatted output appears. If it is invalid, an error message shows the exact location of the syntax error. This makes the formatter also function as a JSON validator.
What is the difference between JSON formatting and JSON minifying?
JSON formatting expands JSON with indentation and line breaks for human readability. JSON minifying does the opposite — it removes all whitespace to produce the smallest possible JSON string, useful for reducing API response or file sizes.
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