JSON Beautifier

Beautify JSON with syntax highlighting, sorted keys and a summary of its structure.

What is the JSON Beautifier?

Beautifying makes JSON easy to scan: keys, strings, numbers, booleans and nulls are shown in different colours.

How does it work?

The JSON is parsed, keys are optionally sorted recursively, then printed with indentation and escaped before colour highlighting — so no input is ever executed as HTML.

Example

Keys appear in blue, strings in green, numbers in amber and booleans in pink.

Frequently asked questions

Is my data sent to a server?

No. This tool runs entirely in your browser; nothing you paste is uploaded or stored.

Why is my JSON invalid?

Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, comments, and NaN or undefined values — none of which are allowed in JSON.

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