MMaster Tools
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JSON Beautifier

Reformat JSON with sorted keys and readable indentation for easier reading and diffing.

How it works

  1. 1

    Paste any JSON into the input — the more jumbled the better.

  2. 2

    Keys are sorted alphabetically by default, making diffs and reviews easier.

  3. 3

    Download or copy the tidied result. Everything runs in your browser.

Questions

How is this different from the JSON Formatter?

JSON Beautifier defaults to sorting keys, making it a better starting point when you want both indentation and alphabetical key order at once.

Does sorting keys affect the data?

No. JSON objects are unordered by specification, so reordering keys never changes meaning.

Is my data sent anywhere?

No. The tool runs entirely in your browser with no server contact.

JSON Formatter

JSON Formatter

Paste compact or messy JSON and get it back neatly indented with your chosen spacing.

JSON Minifier

JSON Minifier

Remove all whitespace and line breaks from a JSON document to shrink it as small as possible.

JSON Validator

JSON Validator

Check whether a JSON string is well-formed, and see the exact line and column of any syntax error.

JSON Tree Viewer

JSON Tree Viewer

Explore a JSON document as an interactive collapsible tree — expand and collapse any node.

XML Formatter

XML Formatter

Pretty-print XML with configurable indentation, preserving attributes, comments, and tag order.

XML Validator

XML Validator

Check XML for well-formedness and report every error with its line and column number.

YAML Formatter

YAML Formatter

Normalize and re-indent YAML, or convert it to JSON, with a configurable indent width.

Markdown Preview

Markdown Preview

Render Markdown as formatted HTML with GFM tables and task lists, updating live as you write.