JSON Formatter with Custom Styles

About This Tool

Format JSON with sorted keys, aligned values, and custom indentation options. This tool runs entirely in your browser — no data is ever sent to a server. Free to use, no account required.

JSON Formatting Styles Explained

The formatter offers four indentation styles, each suited to different coding environments and team conventions.

2-Space Indentation

The most popular style, used by JSON.stringify, Node.js, and most JavaScript linters. 2-space indentation balances readability with vertical compactness, producing clean output without excessive line height.

4-Space and Tab Indentation

4-space indentation matches Python and Java conventions. Tab indentation is preferred by editors configured with tab settings and produces smaller files when tabs are displayed wider than spaces.

Additional Formatting Options

Beyond indentation, the formatter offers key sorting and compact output to meet different workflow requirements.

Sorted Keys

Sorting keys alphabetically makes large JSON documents easier to scan and produces consistent diffs in version control — two JSON files with identical data in different key order will diff as identical when both are sorted.

Compact / Minified Output

Removing all whitespace produces the smallest possible JSON string, ideal for API responses, localStorage, and network transmission where file size matters more than human readability.

JSON Formatting Style Examples

Different projects, languages, and tools prefer different JSON formatting conventions. Here's a reference for the most common styles used across the industry.

2-Space Indent (JavaScript/Web Standard)

{
  "name": "Alice",
  "roles": [
    "admin",
    "user"
  ]
}

4-Space Indent (Python/Java Standard)

{
    "name": "Alice",
    "roles": [
        "admin",
        "user"
    ]
}

Tab Indent

{
	"name": "Alice",
	"roles": [
		"admin",
		"user"
	]
}

Compact (Minified)

{"name":"Alice","roles":["admin","user"]}

Formatting Style By Language Convention