My JSON JSON formatter

My JSON
— Format JSON easily

Free, no signup. Paste and go.
Pretty-print, then edit attributes by type.

Nothing uploaded

JSON stays in your browser. We never send your input to a server.

Format & validate

Indent and check syntax. Copy the result in one click.

Parameter editor

Add and remove nested String / Number / Boolean / Null / Map / List.

How to use

  1. 1

    Paste JSON

    Put your JSON into the text area.

  2. 2

    Format

    Hit Format for pretty output and a quick validation check.

  3. 3

    Edit & copy

    Tweak values in the parameter editor, then copy when ready.

Format JSON

My JSON is a free browser tool to format, validate, and edit JSON — including nested Maps and Lists. Your data never leaves the device.